1
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Yang G, Peng Z, Liu H, Wu D, Liang P, Wei L, Chao X, Yang Z. Giant dielectric response and relaxation behavior of Bi 3+/W 6+ co-doped TiO 2 ceramics. Phys Chem Chem Phys 2024; 26:8834-8841. [PMID: 38426247 DOI: 10.1039/d3cp06154j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
With the rapid development of electronic information technology, dielectric ceramics are widely used in the field of passive devices such as multi-layer ceramic capacitors. In this paper, (Bi2/3W1/3)xTi1-xO2 (BWTOx) ceramics with superior dielectric properties have been prepared by using a traditional solid-state method. Remarkably, at a (Bi2/3W1/3)4+ doping level of 0.01, a (Bi2/3W1/3)0.01Ti0.99O2 ceramic achieved a giant dielectric permittivity of ∼1.5 × 104 and a low loss tangent of ∼0.07 at 1 kHz, as well as a good temperature independence, which could satisfy the operating temperature standards for X9R capacitors. The abnormal dielectric relaxation in the low temperature region can be explained by the interface polarization. Data based on the complex impedance spectroscopy and X-ray photoemission spectroscopy results indicate that the colossal permittivity of BWTOx ceramics is mainly ascribed to the internal barrier layer capacitance effect. The findings of this work could provide valuable insights for achieving large dielectric constants and good temperature stability simultaneously in BWTOx and other related electronic ceramic materials.
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Affiliation(s)
- Guoyan Yang
- Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
| | - Zhanhui Peng
- Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
| | - Huan Liu
- Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
| | - Di Wu
- Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
| | - Pengfei Liang
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China
| | - Linling Wei
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China
| | - Xiaolian Chao
- Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
| | - Zupei Yang
- Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
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2
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Shimano Y, Kutana A, Asahi R. Machine learning and atomistic origin of high dielectric permittivity in oxides. Sci Rep 2023; 13:22236. [PMID: 38097712 PMCID: PMC10721917 DOI: 10.1038/s41598-023-49603-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 12/10/2023] [Indexed: 12/17/2023] Open
Abstract
Discovering new stable materials with large dielectric permittivity is important for future energy storage and electronics applications. Theoretical and computational approaches help design new materials by elucidating microscopic mechanisms and establishing structure-property relations. Ab initio methods can be used to reliably predict the dielectric response, but for fast materials screening, machine learning (ML) approaches, which can directly infer properties from the structural information, are needed. Here, random forest and graph convolutional neural network models are trained and tested to predict the dielectric constant from the structural information. We create a database of the dielectric properties of oxides and design, train, and test the two ML models. Both approaches show similar performance and can successfully predict response based on the structure. The analysis of the feature importance allows identification of local geometric features leading to the high dielectric permittivity of the crystal. Dimensionality reduction and clustering further confirms the relevance of descriptors and compositional features for obtaining high dielectric permittivity.
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Affiliation(s)
- Yuho Shimano
- Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
| | - Alex Kutana
- Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
| | - Ryoji Asahi
- Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan.
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3
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Zhou Q, Wu WW, Song YC, Wang Z, Yuan C, Han LL, Liu JQ, Yang Y, Liu P. Improvement of the dielectric properties of rutile TiO2 ceramics at megahertz. Ann Ital Chir 2022. [DOI: 10.1016/j.jeurceramsoc.2022.11.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Siriya P, Moontragoon P, Srepusharawoot P, Thongbai P. Giant Dielectric Properties of W 6+-Doped TiO 2 Ceramics. Molecules 2022; 27:molecules27196529. [PMID: 36235067 PMCID: PMC9573295 DOI: 10.3390/molecules27196529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/27/2022] [Accepted: 09/28/2022] [Indexed: 11/07/2022] Open
Abstract
The effects of the sintering temperature and doping level concentration on the microstructures, dielectric response, and electrical properties of W6+-doped TiO2 (WTO) prepared via a solid-state reaction method were investigated. A highly dense microstructure, pure rutile-TiO2, and homogenously dispersed dopant elements were observed in all of the ceramic samples. The mean grain size increased as the doping concentration and sintering temperature increased. The presence of oxygen vacancies was studied. A giant dielectric permittivity (ε′ ~ 4 × 104) and low tanδ (~0.04) were obtained in the WTO ceramic sintered at 1500 °C for 5 h. The ε′ response at a low temperature was improved by increasing the doping level concentration. The giant ε′ response in WTO ceramics can be described by the interfacial polarization at the interface between the semiconducting and insulating parts, which was supported by the impedance spectroscopy.
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Affiliation(s)
- Porntip Siriya
- Giant Dielectric and Computational Design Research Group (GD–CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Pairot Moontragoon
- Giant Dielectric and Computational Design Research Group (GD–CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
- Institute of Nanomaterials Research and Innovation for Energy (IN–RIE), Khon Kaen University, Khon Kaen 40002, Thailand
| | - Pornjuk Srepusharawoot
- Giant Dielectric and Computational Design Research Group (GD–CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
- Institute of Nanomaterials Research and Innovation for Energy (IN–RIE), Khon Kaen University, Khon Kaen 40002, Thailand
- Correspondence: (P.S.); (P.T.)
| | - Prasit Thongbai
- Giant Dielectric and Computational Design Research Group (GD–CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
- Institute of Nanomaterials Research and Innovation for Energy (IN–RIE), Khon Kaen University, Khon Kaen 40002, Thailand
- Correspondence: (P.S.); (P.T.)
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5
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Siriya P, Pengpad A, Srepusharawoot P, Chanlek N, Thongbai P. Improved microstructure and significantly enhanced dielectric properties of Al 3+/Cr 3+/Ta 5+ triple-doped TiO 2 ceramics by Re-balancing charge compensation. RSC Adv 2022; 12:4946-4954. [PMID: 35425479 PMCID: PMC8981224 DOI: 10.1039/d1ra08847e] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 01/25/2022] [Indexed: 11/21/2022] Open
Abstract
The charge compensation mechanism and dielectric properties of the (Al x Cr0.05-x )Ta0.05Ti0.9O2 ceramics were studied. The mean grain size slightly changed with the increase in the Al3+/Cr3+ ratio, while the porosity was significantly reduced. The dielectric permittivity of the co-doped Cr0.05Ta0.05Ti0.9O2 ceramic was as low as ε'∼ 103, which was described by self-charge compensation between Cr3+-Ta5+, suppressing the formation of Ti3+. Interestingly, ε' can be significantly increased (6.68 × 104) by re-balancing the charge compensation via triple doping with Al3+ in the Al3+/Cr3+ ratio of 1.0, while a low loss tangent (∼0.07) was obtained. The insulating grains of [Cr0.05 3+Ta0.05 5+]Ti0.9 4+O12 has become the semiconducting grains for the triple-doped Al x 3+[Cr0.05-x 3+Ta0.05-x 5+][Ta x 5+Ti x 3+Ti0.9+x 4+]O12+3x/2. Considering an insulating grain with low ε' of the Cr0.05Ta0.05Ti0.9O2 ceramic, the electron-pinned defect-dipoles and interfacial polarization were unlikely to exist supported by the first principles calculations. The significantly enhanced ε' value of the triple-doped ceramic was primarily contributed by the interfacial polarization at the interface between the semiconducting and insulating parts, which was supported by impedance spectroscopy. This research gives an underlying mechanism on the charge compensation in the Al3+/Cr3+/Ta5+-doped TiO2 system for further designing the dielectric and electrical properties of TiO2-based ceramics for capacitor applications.
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Affiliation(s)
- Porntip Siriya
- Giant Dielectric and Computational Design Research Group (GD-CDR), Department of Physics, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
| | - Atip Pengpad
- Giant Dielectric and Computational Design Research Group (GD-CDR), Department of Physics, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
| | - Pornjuk Srepusharawoot
- Giant Dielectric and Computational Design Research Group (GD-CDR), Department of Physics, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
| | - Narong Chanlek
- Synchrotron Light Research Institute (Public Organization), 111 University Avenue Muang District Nakhon Ratchasima 30000 Thailand
| | - Prasit Thongbai
- Giant Dielectric and Computational Design Research Group (GD-CDR), Department of Physics, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
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6
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Song Y, Liu P, Wu W, Zhou Q. High-performance colossal permittivity for textured (Al+Nb) co-doped TiO2 ceramics sintered in nitrogen atmosphere. Ann Ital Chir 2021. [DOI: 10.1016/j.jeurceramsoc.2021.02.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Tuichai W, Danwittayakul S, Chanlek N, Takesada M, Pengpad A, Srepusharawoot P, Thongbai P. High-Performance Giant Dielectric Properties of Cr 3+/Ta 5+ Co-Doped TiO 2 Ceramics. ACS OMEGA 2021; 6:1901-1910. [PMID: 33521430 PMCID: PMC7841783 DOI: 10.1021/acsomega.0c04666] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 12/31/2020] [Indexed: 06/12/2023]
Abstract
The effects of the sintering temperature on microstructures, electrical properties, and dielectric response of 1%Cr3+/Ta5+ co-doped TiO2 (CrTTO) ceramics prepared using a solid-state reaction method were studied. The mean grain size increased with an increasing sintering temperature range of 1300-1500 °C. The dielectric permittivity of CrTTO ceramics sintered at 1300 °C was very low (ε' ∼198). Interestingly, a low loss tangent (tanδ ∼0.03-0.06) and high ε' (∼1.61-1.9 × 104) with a temperature coefficient less than ≤ ±15% in a temperature range of -60 to 150 °C were obtained. The results demonstrated a higher performance property of the acceptor Cr3+/donor Ta5+ co-doped TiO2 ceramics compared to the Ta5+-doped TiO2 and Cr3+-doped TiO2 ceramics. According to a first-principles study, high-performance giant dielectric properties (HPDPs) did not originate from electron-pinned defect dipoles. By impedance spectroscopy (IS), it was suggested that the giant dielectric response was induced by interfacial polarization at the internal interfaces rather than by the formation of complex defect dipoles. X-ray photoelectron spectroscopy (XPS) results confirmed the existence of Ti3+, resulting in the formation of semiconducting parts in the bulk ceramics. Low tanδ and excellent temperature stability were due to the high resistance of the insulating layers with a very high potential barrier of ∼2.0 eV.
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Affiliation(s)
- Wattana Tuichai
- Department
of Physics, Faculty of Science, Khon Kaen
University, Khon Kaen 40002, Thailand
| | - Supamas Danwittayakul
- National
Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Rd. Klong
1, Klong Luang, Pathum Thani 12120, Thailand
| | - Narong Chanlek
- Synchrotron
Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand
| | - Masaki Takesada
- Department
of Physics, Hokkaido University, Sapporo 060-0810, Japan
| | - Atip Pengpad
- Department
of Physics, Faculty of Science, Khon Kaen
University, Khon Kaen 40002, Thailand
- Institute
of Nanomaterials Research and Innovation for Energy (IN−RIE),
NANOTEC−KKU RNN on Nanomaterials Research and Innovation for
Energy, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Pornjuk Srepusharawoot
- Department
of Physics, Faculty of Science, Khon Kaen
University, Khon Kaen 40002, Thailand
- Institute
of Nanomaterials Research and Innovation for Energy (IN−RIE),
NANOTEC−KKU RNN on Nanomaterials Research and Innovation for
Energy, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Prasit Thongbai
- Department
of Physics, Faculty of Science, Khon Kaen
University, Khon Kaen 40002, Thailand
- Institute
of Nanomaterials Research and Innovation for Energy (IN−RIE),
NANOTEC−KKU RNN on Nanomaterials Research and Innovation for
Energy, Khon Kaen University, Khon Kaen 40002, Thailand
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8
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Peng Z, Wang J, Liang P, Zhu J, Zhou X, Chao X, Yang Z. A new perovskite-related ceramic with colossal permittivity and low dielectric loss. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2020.04.030] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Nachaithong T, Moontragoon P, Chanlek N, Thongbai P. Fe 3+/Nb 5+ Co-doped rutile-TiO 2 nanocrystalline powders prepared by a combustion process: preparation and characterization and their giant dielectric response. RSC Adv 2020; 10:24784-24794. [PMID: 35517467 PMCID: PMC9055153 DOI: 10.1039/d0ra02963g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 06/19/2020] [Indexed: 11/21/2022] Open
Abstract
Fe3+/Nb5+ co-doped TiO2 (FeNb-TO) nanocrystalline powders were prepared by a combustion process. A pure rutile-TiO2 phase of powders and sintered ceramics with a dense microstructure was achieved. Both co-dopants were homogeneously dispersed in the ceramic microstructure. The presence of oxygen vacancies was confirmed by Raman and X-ray photoelectron spectroscopy techniques. The low-frequency dielectric permittivity enhanced as co-doping concentration increased. The thermally activated giant-dielectric relaxation of FeNb-TO ceramics was observed. Removing the outer-surface layer had a slight effect on the dielectric properties of FeNb-TO ceramics. Density functional theory (DFT) calculation showed that, in the energy preferable configuration, the 2Fe atoms are located near the oxygen vacancy, forming a triangle-shaped FeVoTi defect complex. This defect cluster was far away from the diamond-shaped 2Nb2Ti defect complex. Thus, the electron-pinned defect-dipoles (EPDD) cannot be formed. The giant-dielectric relaxation process of the FeNb-TO ceramics might be attributed to the interfacial polarization associated with electron hopping between Ti3+/Ti4+ ions inside the grains, rather than due to the surface barrier layer capacitor (SBLC) or EPDD effect.
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Affiliation(s)
- Theeranuch Nachaithong
- Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
| | - Pairot Moontragoon
- Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), Research Network of NANOTEC-KKU (RNN), Khon Kaen University Khon Kaen 40002 Thailand .,Thailand Center of Excellence in Physics, Commission on Higher Education Bangkok 10400 Thailand.,Department of Physics, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
| | - Narong Chanlek
- Synchrotron Light Research Institute (Public Organization) 111 University Avenue, Muang District Nakhon Ratchasima 30000 Thailand
| | - Prasit Thongbai
- Department of Physics, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
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10
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Feng Y, Wu J, Chi Q, Li W, Yu Y, Fei W. Defects and Aliovalent Doping Engineering in Electroceramics. Chem Rev 2020; 120:1710-1787. [DOI: 10.1021/acs.chemrev.9b00507] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Yu Feng
- Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, P. R. China
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, P. R. China
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Jiagang Wu
- Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China
| | - Qingguo Chi
- Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Weili Li
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, P. R. China
| | - Yang Yu
- Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, P. R. China
| | - Weidong Fei
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, P. R. China
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11
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Structural Phase Transition and Metallization of Nanocrystalline Rutile Investigated by High-Pressure Raman Spectroscopy and Electrical Conductivity. MINERALS 2019. [DOI: 10.3390/min9070441] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We investigate the structural, vibrational, and electrical transport properties of nanocrystalline rutile and its high-pressure polymorphs by Raman spectroscopy, and AC complex impedance spectroscopy in conjunction with the high-resolution transmission electron microscopy (HRTEM) up to ~25.0 GPa using the diamond anvil cell (DAC). Experimental results indicate that the structural phase transition and metallization for nanocrystalline rutile occurred with increasing pressure up to ~12.3 and ~14.5 GPa, respectively. The structural phase transition of sample at ~12.3 GPa is confirmed as a baddeleyite phase, which is verified by six new Raman characteristic peaks. The metallization of the baddeleyite phase is manifested by the temperature-dependent electrical conductivity measurements at ~14.5 GPa. However, upon decompression, the structural phase transition from the metallic baddeleyite to columbite phases at ~7.2 GPa is characterized by the inflexion point of the pressure coefficient and the pressure-dependent electrical conductivity. The recovered columbite phase is always retained to the atmospheric condition, which belongs to an irreversible phase transformation.
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12
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Zhao C, Wu J. Effects of Secondary Phases on the High-Performance Colossal Permittivity in Titanium Dioxide Ceramics. ACS APPLIED MATERIALS & INTERFACES 2018; 10:3680-3688. [PMID: 29328630 DOI: 10.1021/acsami.7b18356] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The intensive demands of microelectronics and energy-storage applications are driving the increasing investigations on the colossal permittivity (CP) materials. In this study, we designed a new system of Dy and Nb co-doped TiO2 ceramics [(Dy0.5Nb0.5)xTi1-xO2] with the formation of secondary phases, and then the enhancement of overall dielectric properties (εr ∼ 5.0-6.5 × 104 and tan δ < 8%) was realized in the broad composition range of 0.5 ≤ x ≤ 5%. More importantly, effects of secondary phases on microstructure, dielectric properties, and stability were explored from the views of defect-dipoles and internal barrier layer capacitance (IBLC) effect. According to the defect-dipoles theory, the CP should mainly originate from Nb5+, and the Dy3+ largely contributes to the decreased dielectric loss. Both CP and low dielectric loss were obtained for co-doping with Dy3+ and Nb5+. Besides, the Dy enrichment induced the formation of secondary phases, which were regarded as the low loss unit dispersed into the ceramic matrix, and largely facilitate the decreased dielectric loss. In particular, the analysis of temperature-dependent complex impedance spectra indicated that a stronger IBLC effect caused by the increased grain boundary resistance can also contribute to the optimized CP and low dielectric loss under appropriate contents of secondary phases.
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Affiliation(s)
- Chunlin Zhao
- Department of Materials Science, Sichuan University , Chengdu 610064, China
| | - Jiagang Wu
- Department of Materials Science, Sichuan University , Chengdu 610064, China
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13
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Ke S, Li T, Ye M, Lin P, Yuan W, Zeng X, Chen L, Huang H. Origin of colossal dielectric response in (In + Nb) co-doped TiO 2 rutile ceramics: a potential electrothermal material. Sci Rep 2017; 7:10144. [PMID: 28860639 PMCID: PMC5579281 DOI: 10.1038/s41598-017-10562-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 08/11/2017] [Indexed: 11/09/2022] Open
Abstract
(In + Nb) co-doped TiO2 (TINO) rutile is an emerging material with a colossal dielectric permittivity (CP) and a low dielectric loss over wide temperature and frequency ranges. The electrical inhomogeneous nature of TINO ceramics is demonstrated by direct local current probing with high-resolution conductive atomic force microscopy (cAFM). The CP response in TINO is found to originate from the electron-pinned defect dipole induced conductive cluster effect and the electrode effect. Two types of dielectric relaxations are simultaneously observed due to these two effects. With the given synthesis condition, we found TINO shows a highly leaky feature that impairs its application as a dielectric material. However, the fast-temperature-rising phenomenon found in this work may open a new door for TINO to be applied as a potential electrothermal material with high efficiency, oxidation-proof, high temperature stability, and energy saving.
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Affiliation(s)
- Shanming Ke
- Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, PR China.
| | - Tao Li
- Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, PR China
| | - Mao Ye
- Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, PR China
| | - Peng Lin
- Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, PR China
| | - Wenxiang Yuan
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, PR China.
| | - Xierong Zeng
- Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, PR China
| | - Lang Chen
- Department of Physics, South University of Science and Technology of China, Shenzhen, 518055, PR China
| | - Haitao Huang
- Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China
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14
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Colossal permittivity behavior and its origin in rutile (Mg 1/3Ta 2/3) xTi 1-xO 2. Sci Rep 2017; 7:9950. [PMID: 28855617 PMCID: PMC5577065 DOI: 10.1038/s41598-017-08992-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 07/21/2017] [Indexed: 12/02/2022] Open
Abstract
This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg2+, Ta5+) co-doped rutile TiO2 polycrystalline ceramics with nominal compositions of (Mg2+1/3Ta5+2/3)xTi1−xO2. Colossal permittivity (>7000) with a low dielectric loss (e.g. 0.002 at 1 kHz) across a broad frequency/temperature range can be achieved at x = 0.5% after careful optimization of process conditions. Both experimental and theoretical evidence indicates such a colossal permittivity and low dielectric loss intrinsically originate from the intragrain polarization that links to the electron-pinned \documentclass[12pt]{minimal}
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\begin{document}$${\bf{M}}{{\bf{g}}}_{{\bf{T}}{\bf{i}}}^{{\prime}{\prime} }+{{\bf{V}}}_{{\bf{O}}}^{\bullet \bullet }+{\bf{2}}{\bf{T}}{{\bf{a}}}_{{\bf{T}}{\bf{i}}}^{\bullet }+{\bf{2}}{\bf{T}}{{\bf{i}}}_{{\bf{T}}{\bf{i}}}^{\prime}$$\end{document}MgTi′′+VO••+2TaTi•+2TiTi′ defect clusters with a specific configuration, different from the defect cluster form previously reported in tri-/pent-valent ion co-doped rutile TiO2. This work extends the research on colossal permittivity and defect formation to bi-/penta-valent ion co-doped rutile TiO2 and elucidates a likely defect cluster model for this system. We therefore believe these results will benefit further development of colossal permittivity materials and advance the understanding of defect chemistry in solids.
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Abstract
In this work, the (Y0.5Nb0.5)xTi1−xO2 (x = 0.001, 0.01, 0.02, 0.04, 0.06 and 0.1) ceramics (as called YNTO) were fabricated by synthesized through a standard solid-state reaction. As revealed by the X-ray diffraction (XRD) spectra, the YNTOs exhibit tetragonal rutile structure. Meanwhile, the grain size of YNTO ceramics increased and then decreased with the increase of x value, and the largest value reached when x = 0.02. All the YNTO samples display colossal permittivity (~102–105) over a wide temperature and frequency range. Moreover, the optimal ceramic, (Y0.5Nb0.5)0.02Ti0.98O2, exhibits high performance over a broad temperature range from 20 °C to 180 °C; specifically, at 1 kHz, the dielectric constant and dielectric loss are 6.55 × 104 and 0.22 at room temperature, and they are 1.03 × 105 and 0.11 at 180 °C, respectively.
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16
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Kawarasaki M, Tanabe K, Terasaki I, Fujii Y, Taniguchi H. Intrinsic Enhancement of Dielectric Permittivity in (Nb + In) co-doped TiO 2 single crystals. Sci Rep 2017; 7:5351. [PMID: 28706304 PMCID: PMC5509748 DOI: 10.1038/s41598-017-05651-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 06/01/2017] [Indexed: 11/17/2022] Open
Abstract
The development of dielectric materials with colossal permittivity is important for the miniaturization of electronic devices and fabrication of high-density energy-storage devices. The electron-pinned defect-dipoles has been recently proposed to boost the permittivity of (Nb + In) co-doped TiO2 to 105. However, the follow-up studies suggest an extrinsic contribution to the colossal permittivity from thermally excited carriers. Herein, we demonstrate a marked enhancement in the permittivity of (Nb + In) co-doped TiO2 single crystals at sufficiently low temperatures such that the thermally excited carriers are frozen out and exert no influence on the dielectric response. The results indicate that the permittivity attains quadruple of that for pure TiO2. This finding suggests that the electron-pinned defect-dipoles add an extra dielectric response to that of the TiO2 host matrix. The results offer a novel approach for the development of functional dielectric materials with large permittivity by engineering complex defects into bulk materials.
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Affiliation(s)
| | - Kenji Tanabe
- Department of Physics, Nagoya University, Nagoya, 464-8602, Japan
| | - Ichiro Terasaki
- Department of Physics, Nagoya University, Nagoya, 464-8602, Japan
| | - Yasuhiro Fujii
- Department of Physical Sciences, Ritsumeikan University, Kusatsu, 525-8577, Japan
| | - Hiroki Taniguchi
- Department of Physics, Nagoya University, Nagoya, 464-8602, Japan.
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17
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Yao Z, Song Z, Hao H, Yu Z, Cao M, Zhang S, Lanagan MT, Liu H. Homogeneous/Inhomogeneous-Structured Dielectrics and their Energy-Storage Performances. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1601727. [PMID: 28229531 DOI: 10.1002/adma.201601727] [Citation(s) in RCA: 157] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 11/14/2016] [Indexed: 05/27/2023]
Abstract
The demand for dielectric capacitors with higher energy-storage capability is increasing for power electronic devices due to the rapid development of electronic industry. Existing dielectrics for high-energy-storage capacitors and potential new capacitor technologies are reviewed toward realizing these goals. Various dielectric materials with desirable permittivity and dielectric breakdown strength potentially meeting the device requirements are discussed. However, some significant limitations for current dielectrics can be ascribed to their low permittivity, low breakdown strength, and high hysteresis loss, which will decrease their energy density and efficiency. Thus, the implementation of dielectric materials for high-energy-density applications requires the comprehensive understanding of both the materials design and processing. The optimization of high-energy-storage dielectrics will have far-reaching impacts on the sustainable energy and will be an important research topic in the near future.
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Affiliation(s)
- Zhonghua Yao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science and Engineering (ISMSE), Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Zhe Song
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science and Engineering (ISMSE), Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Hua Hao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science and Engineering (ISMSE), Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Zhiyong Yu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science and Engineering (ISMSE), Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Minghe Cao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science and Engineering (ISMSE), Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Shujun Zhang
- Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, North Wollongong, NSW, 2500, Australia
| | - Michael T Lanagan
- Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802-4800, USA
| | - Hanxing Liu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science and Engineering (ISMSE), Wuhan University of Technology, Wuhan, 430070, P. R. China
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18
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Tuichai W, Danwittayakul S, Chanlek N, Srepusharawoot P, Thongbai P, Maensiri S. Origin(s) of the apparent colossal permittivity in (In1/2Nb1/2)xTi1−xO2: clarification on the strongly induced Maxwell–Wagner polarization relaxation by DC bias. RSC Adv 2017. [DOI: 10.1039/c6ra26728a] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The effects of DC bias on the dielectric and electrical properties of co-doped (In1/2Nb1/2)xTi1−xO2 (IN-T), where x = 0.05 and 0.1, and single-doped Ti0.975Nb0.025O2 ceramics are investigated.
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Affiliation(s)
- Wattana Tuichai
- Department of Physics
- Faculty of Science
- Khon Kaen University
- Khon Kaen 40002
- Thailand
| | - Supamas Danwittayakul
- National Metal and Materials Technology Center
- National Science and Technology Development Agency
- 114 Thailand Science Park
- Klong Luang
- Thailand
| | - Narong Chanlek
- Synchrotron Light Research Institute (Public Organization)
- Nakhon Ratchasima 30000
- Thailand
| | | | - Prasit Thongbai
- Department of Physics
- Faculty of Science
- Khon Kaen University
- Khon Kaen 40002
- Thailand
| | - Santi Maensiri
- School of Physics
- Institute of Science
- Suranaree University of Technology
- Nakhon Ratchasima 30000
- Thailand
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19
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Tsuji K, Han H, Guillemet-Fritsch S, Randall CA. Dielectric relaxation and localized electron hopping in colossal dielectric (Nb,In)-doped TiO2 rutile nanoceramics. Phys Chem Chem Phys 2017; 19:8568-8574. [PMID: 28289735 DOI: 10.1039/c7cp00042a] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The large dielectric relaxation and the frequency-dependent a.c. conductance were successfully explained by a modified electron hopping model.
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Affiliation(s)
- Kosuke Tsuji
- Center for Dielectrics and Piezoelectrics
- Materials Research Institute
- Department of Material Science and Engineering
- The Pennsylvania State University
- Pennsylvania 16802
| | - HyukSu Han
- Korea Institute of Industrial Technology
- Gangwon-do
- Republic of Korea
- CIRIMAT
- Université de Toulouse
| | | | - Clive A. Randall
- Center for Dielectrics and Piezoelectrics
- Materials Research Institute
- Department of Material Science and Engineering
- The Pennsylvania State University
- Pennsylvania 16802
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20
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Origin of colossal dielectric permittivity of rutile Ti₀.₉In₀.₀₅Nb₀.₀₅O₂: single crystal and polycrystalline. Sci Rep 2016; 6:21478. [PMID: 26869187 PMCID: PMC4751469 DOI: 10.1038/srep21478] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 01/25/2016] [Indexed: 11/25/2022] Open
Abstract
In this paper, we investigated the dielectric properties of (In + Nb) co-doped rutile TiO2 single crystal and polycrystalline ceramics. Both of them showed colossal, up to 104, dielectric permittivity at room temperature. The single crystal sample showed one dielectric relaxation process with a large dielectric loss. The voltage-dependence of dielectric permittivity and the impedance spectrum suggest that the high dielectric permittivity of single crystal originated from the surface barrier layer capacitor (SBLC). The impedance spectroscopy at different temperature confirmed that the (In + Nb) co-doped rutile TiO2 polycrystalline ceramic had semiconductor grains and insulating grain boundaries, and that the activation energies were calculated to be 0.052 eV and 0.35 eV for grain and grain boundary, respectively. The dielectric behavior and impedance spectrum of the polycrystalline ceramic sample indicated that the internal barrier layer capacitor (IBLC) mode made a major contribution to the high ceramic dielectric permittivity, instead of the electron-pinned defect-dipoles.
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21
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Liu G, Fan H, Xu J, Liu Z, Zhao Y. Colossal permittivity and impedance analysis of niobium and aluminum co-doped TiO2 ceramics. RSC Adv 2016. [DOI: 10.1039/c6ra07746c] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Niobium and aluminum co-doped TiO2 ceramics, i.e., (Nb0.5Al0.5)xTi1−xO2 (x = 0, 0.01, 0.05, 0.1, 0.15, abbreviated as NAT100x) were synthesized via a solid-state reaction route.
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Affiliation(s)
- Guocai Liu
- State Key Laboratory of Solidification Processing
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi'an 710072
- China
| | - Huiqing Fan
- State Key Laboratory of Solidification Processing
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi'an 710072
- China
| | - Jun Xu
- State Key Laboratory of Solidification Processing
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi'an 710072
- China
| | - Zhiyong Liu
- State Key Laboratory of Solidification Processing
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi'an 710072
- China
| | - Yuwei Zhao
- State Key Laboratory of Solidification Processing
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi'an 710072
- China
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22
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Li J, Xu Z, Li F, Zhu X, Zhang S. SiO2–Ti0.98In0.01Nb0.01O2 composite ceramics with low dielectric loss, high dielectric permittivity and an enhanced breakdown electric field. RSC Adv 2016. [DOI: 10.1039/c5ra20461e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
SiO2–Ti0.98In0.01Nb0.01O2 (SiO2–TINO) composite ceramics were synthesized by solid-state sintering methods, where the lower dielectric loss and enhanced breakdown electric field were achieved.
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Affiliation(s)
- Jinglei Li
- Electronic Materials Research Laboratory
- Key Laboratory of the Ministry of Education and International Centre for Dielectric Research
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - Zhuo Xu
- Electronic Materials Research Laboratory
- Key Laboratory of the Ministry of Education and International Centre for Dielectric Research
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - Fei Li
- Electronic Materials Research Laboratory
- Key Laboratory of the Ministry of Education and International Centre for Dielectric Research
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - Xuhui Zhu
- Electronic Materials Research Laboratory
- Key Laboratory of the Ministry of Education and International Centre for Dielectric Research
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - Shujun Zhang
- Materials Research Institute
- Pennsylvania State University
- University Park
- Pennsylvania 16802
- USA
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23
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Mandal BP, Anithakumari P, Nigam S, Majumder C, Mohapatra M, Tyagi AK. Enhancement of dielectric constant in a niobium doped titania system: an experimental and theoretical study. NEW J CHEM 2016. [DOI: 10.1039/c6nj00176a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A very high dielectric constant of Nb doped titania is observed due to both the interfacial effect and formation of complex defect dipoles.
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Affiliation(s)
- Balaji P. Mandal
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
| | - P. Anithakumari
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
| | - Sandeep Nigam
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
| | | | - Manoj Mohapatra
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
| | - Avesh K. Tyagi
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
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24
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Tsuji K, Chen WT, Guo H, Chen XM, Lee TK, Lee WH, Randall CA. Valence and electronic trap states of manganese in SrTiO3-based colossal permittivity barrier layer capacitors. RSC Adv 2016. [DOI: 10.1039/c6ra15635e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Valence and trap level of manganese in the (Mn, Nb)-doped SrTiO3 internal barrier layer capacitor was revealed by EELS and Q-DLTS, explaining macroscopic properties.
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Affiliation(s)
- Kosuke Tsuji
- Center for Dielectrics and Piezoelectrics
- Materials Research Institute
- Department of Material Science and Engineering
- The Pennsylvania State University
- USA
| | - Wei-Ting Chen
- Center for Dielectrics and Piezoelectrics
- Materials Research Institute
- Department of Material Science and Engineering
- The Pennsylvania State University
- USA
| | - Hanzheng Guo
- Center for Dielectrics and Piezoelectrics
- Materials Research Institute
- Department of Material Science and Engineering
- The Pennsylvania State University
- USA
| | - Xiao-Ming Chen
- School of Physics and Information Technology
- Shaanxi Normal University
- Xi'an
- P. R. China
| | - Tai-Kuang Lee
- Department of Electrical Engineering
- National Cheng Kung University
- Tainan City 701
- Republic of China
| | - Wen-Hsi Lee
- Department of Electrical Engineering
- National Cheng Kung University
- Tainan City 701
- Republic of China
| | - Clive A. Randall
- Center for Dielectrics and Piezoelectrics
- Materials Research Institute
- Department of Material Science and Engineering
- The Pennsylvania State University
- USA
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