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Yanchevskii O, V'yunov O, Plutenko T, Belous A, Trachevskii V, Matolínová I, Veltruská K, Kalinovych V, Lobko Y. Microstructure, chemical composition, and dielectric response of CaCu 3Ti 4O 12 ceramics doped with F, Al, and Mg ions. Heliyon 2023; 9:e18523. [PMID: 37533983 PMCID: PMC10392100 DOI: 10.1016/j.heliyon.2023.e18523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/18/2023] [Accepted: 07/20/2023] [Indexed: 08/04/2023] Open
Abstract
Ceramics with nominal chemical composition CaCu3Ti4O12 (CCTO), CaCu3Ti3.96Al0.04O11.96F0.04 (CCTOAF), and Ca0.98Mg0.08Cu2.94Ti3.96Al0.04O11.96F0.04 (CCTOMAF) were prepared by the solid-state reactions technique. Using SEM, EDX, XPS, EPR, NMR, and complex impedance spectroscopy, the microstructure, elements distribution, chemical composition of grains and grain boundaries, and the dielectric response of ceramics were investigated. In the ССТО, CCTOAF, and CCTOMAF series, the average grain size increases, the degree of copper segregation at the grain boundaries is inversely related to grain size, and the dielectric loss decreases from 0.071 to 0.047 and 0.030, respectively, while dielectric permittivity ε' at 1 kHz is 5.6 × 104, 7.1 × 104, and 4.3 × 104, respectively. Additives of Al, Mg, F and milled particles (ZrO2, Al2O3, and SiO2) can either partially introduce into the perovskite structure or form low-melting eutectics at the grain boundaries, causing abnormal grain growth. The presence of copper ions in various oxidation states, as well as evidence of exchange spin interactions between them, was confirmed in all samples.
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Affiliation(s)
- O.Z. Yanchevskii
- Dept. Solid State Chemistry, V. I. Vernadsky Institute of General and Inorganic Chemistry of the National Academy of Science of Ukraine, Acad. Palladin Ave. 32/34, 03142, Kyiv, Ukraine
| | - O.I. V'yunov
- Dept. Solid State Chemistry, V. I. Vernadsky Institute of General and Inorganic Chemistry of the National Academy of Science of Ukraine, Acad. Palladin Ave. 32/34, 03142, Kyiv, Ukraine
| | - T.O. Plutenko
- Dept. Solid State Chemistry, V. I. Vernadsky Institute of General and Inorganic Chemistry of the National Academy of Science of Ukraine, Acad. Palladin Ave. 32/34, 03142, Kyiv, Ukraine
| | - A.G. Belous
- Dept. Solid State Chemistry, V. I. Vernadsky Institute of General and Inorganic Chemistry of the National Academy of Science of Ukraine, Acad. Palladin Ave. 32/34, 03142, Kyiv, Ukraine
| | - V.V. Trachevskii
- G.V. Kurdyumov Institute of Metal Physics of the National Academy of Science of Ukraine, Acad. Vernadskii Ave. 36, 03680, Kyiv, Ukraine
| | - I. Matolínová
- Dept. Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00, Prague, Czech Republic
| | - K. Veltruská
- Dept. Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00, Prague, Czech Republic
| | - V. Kalinovych
- Dept. Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00, Prague, Czech Republic
| | - Ye Lobko
- Dept. Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00, Prague, Czech Republic
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Saqib NU, Shah I, Adnan R. An emerging photocatalyst for wastewater remediation: a mini-review on CaCu 3Ti 4O 12 photocatalysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:40403-40414. [PMID: 35347628 DOI: 10.1007/s11356-022-19703-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 03/10/2022] [Indexed: 06/14/2023]
Abstract
Ceramics-based filter for water treatment is an ancient technology to procure potable water at the household level. The traditional clay pots (vessels or hollow cylindrical container) have been used since long in the developing countries. The ceramic material (CaCu3Ti4O12 or CCTO) is a hetero-junction of titanium oxide, a well-known UV-active photocatalyst, and visible light absorbing CuO materials. This hetero-junction is able to overcome the limitations such as high bandgap, poor stability, low efficiency, and high photo-generated charge (e-/h+) recombination rate, associated with the other commonly used metal oxide semiconductor photocatalysts. Moreover, the low-cost, viable and facile synthesis routes for CCTO triggered its potential applications in photoelectrochemical and photocatalytic processes. This review will elaborate on the available literature demonstrating the visible light activity of CCTO photocatalysts in water treatment technologies. Furthermore, the mechanism of photocatalysis and synthesis routes are presented in this work for broader impact of the CCTO potential applications. The extended porous character and excellent surface texture have made the ceramic materials as an ideal choice to combat the bacteria, pathogens and turbidity in aqueous medium at household level. Specifically, the controlled size and shape make the CaCu3Ti4O12 (CCTO) an excellent visible light-driven photocatalyst, involving highly reactive species such as •OH, •O2- anions, h+, and e-, for the removal of organic and inorganic pollutants from water.
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Affiliation(s)
- Najm Us Saqib
- Department of Chemistry, University of Buner, Buner, KP, Pakistan
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Irfan Shah
- Department of Chemistry, University of Education Faisalabad Campus, Faisalabad, Pakistan
| | - Rohana Adnan
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia.
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Praxedes F, Moreno H, Simões A, Teixeira V, Nunes R, Amoresi R, Ramirez M. Interface matters: Design of an efficient CaCu3Ti4O12-rGO photocatalyst. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117478] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Jumpatam J, Putasaeng B, Chanlek N, Thongbai P. Influences of Sr 2+ Doping on Microstructure, Giant Dielectric Behavior, and Non-Ohmic Properties of CaCu 3Ti 4O 12/CaTiO 3 Ceramic Composites. Molecules 2021; 26:molecules26071994. [PMID: 33915919 PMCID: PMC8036402 DOI: 10.3390/molecules26071994] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/24/2021] [Accepted: 03/26/2021] [Indexed: 11/16/2022] Open
Abstract
The microstructure, dielectric response, and nonlinear current-voltage properties of Sr2+-doped CaCu3Ti4O12/CaTiO3 (CCTO/CTO) ceramic composites, which were prepared by a solid-state reaction method using a single step from the starting nominal composition of CCTO/CTO/xSrO, were investigated. The CCTO and CTO phases were detected in the X-ray diffraction patterns. The lattice parameter increased with increasing Sr2+ doping concentration. The phase compositions of CCTO and CTO were confirmed by energy-dispersive X-ray spectroscopy with elemental mapping in the sintered ceramics. It can be confirmed that most of the Sr2+ ions substituted into the CTO phase, while some minor portion substituted into the CCTO phase. Furthermore, small segregation of Cu-rich was observed along the grain boundaries. The dielectric permittivity of the CCTO/CTO composite slightly decreased by doping with Sr2+, while the loss tangent was greatly reduced. Furthermore, the dielectric properties in a high-temperature range of the Sr2+-doped CCTO/CTO ceramic composites can be improved. Interestingly, the nonlinear electrical properties of the Sr2+-doped CCTO/CTO ceramic composites were significantly enhanced. The improved dielectric and nonlinear electrical properties of the Sr2+-doped CCTO/CTO ceramic composites were explained by the enhancement of the electrical properties of the internal interfaces.
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Affiliation(s)
- Jutapol Jumpatam
- Department of Fundamental Science, Faculty of Science and Technology, Surindra Rajabhat University, Surin 32000, Thailand;
| | - Bundit Putasaeng
- National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani 12120, 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
- Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), Khon Kaen University, Khon Kaen 40002, Thailand
- Correspondence:
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Chupakhina Т, Melnikova N, Kadyrova N, Deeva Y, Mirzorakhimov А, Gavrilova T, Gilmutdinov I, Eremina R. Synthesis, structure, magnetic behavior and dielectric relaxation of the LaxSr2-xFeхTi1-хO4 (х = 0.5, 0.7) oxide ceramic. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121687] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kawrani S, Boulos M, Cornu D, Bechelany M. From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties. ChemistryOpen 2019; 8:922-950. [PMID: 31338276 PMCID: PMC6625108 DOI: 10.1002/open.201900133] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 06/08/2019] [Indexed: 11/11/2022] Open
Abstract
Investigations focusing on electrical energy storage capacitors especially the dielectric ceramic capacitors for high energy storage density are attracting more and more attention in the recent years. Ceramic capacitors possess a faster charge‐discharge rate and improved mechanical and thermal properties compared with other energy storage devices such as batteries. The challenge is to obtain ceramic capacitors with outstanding mechanical, thermal and storage properties over large temperature and frequencies ranges. ABO3 as a type of perovskites showed a strong piezoelectric, dielectric, pyroelectric, and electro‐optic properties useful as energy storage and environmental devices. CaCu3Ti4O12 (CCTO) perovskite with cubic lattice (Im3 symmetry) was discovered to have a colossal dielectric constant (104) that is stable over a wide range of frequencies (10 Hz–1 MHz) and temperature independence (100–300 K). The origin of this high dielectric constant is not fully established, specially because it is the same for single crystal and thin films. In this review, the history of CCTO will be introduced. The synthesis and the sintering approaches, the dopant elements used as well as the applications of CCTO will be reported. In addition to dielectrical properties useful to energy storage devices; CCTO could serve as photocatalytic materials with a very good performance in visible light.
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Affiliation(s)
- Sara Kawrani
- Institut Européen des Membranes ENSCM CNRS Univ Montpellier France.,Laboratoire de Chimie Physique des matériaux Université Libanaise Liban
| | - Madona Boulos
- Laboratoire de Chimie Physique des matériaux Université Libanaise Liban
| | - David Cornu
- Institut Européen des Membranes ENSCM CNRS Univ Montpellier France
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