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Dąbrowa J, Adamczyk J, Stępień A, Zajusz M, Bar K, Berent K, Świerczek K. Synthesis and Properties of the Gallium-Containing Ruddlesden-Popper Oxides with High-Entropy B-Site Arrangement. MATERIALS (BASEL, SWITZERLAND) 2022; 15:ma15186500. [PMID: 36143812 PMCID: PMC9503551 DOI: 10.3390/ma15186500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/14/2022] [Accepted: 09/15/2022] [Indexed: 06/02/2023]
Abstract
For the first time, the possibility of obtaining B-site disordered, Ruddlesden-Popper type, high-entropy oxides has been proven, using as an example the LnSr(Co,Fe,Ga,Mn,Ni)O4 series (Ln = La, Pr, Nd, Sm, or Gd). The materials were synthesized using the Pechini method, followed by sintering at a temperature of 1200 °C. The XRD analysis indicated the single-phase, I4/mmm structure of the Pr-, Nd-, and Sm-based materials, with a minor content of secondary phase precipitates in La- and Gd-based materials. The SEM + EDX analysis confirms the homogeneity of the studied samples. Based on the oxygen non-stoichiometry measurements, the general formula of LnSr(Co,Fe,Ga,Mn,Ni)O4+δ, is established, with the content of oxygen interstitials being surprisingly similar across the series. The temperature dependence of the total conductivity is similar for all materials, with the highest conductivity value of 4.28 S/cm being reported for the Sm-based composition. The thermal expansion coefficient is, again, almost identical across the series, with the values varying between 14.6 and 15.2 × 10-6 K-1. The temperature stability of the selected materials is verified using the in situ high-temperature XRD. The results indicate a smaller impact of the lanthanide cation type on the properties than has typically been reported for conventional Ruddlesden-Popper type oxides, which may result from the high-entropy arrangement of the B-site cations.
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Affiliation(s)
- Juliusz Dąbrowa
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Jan Adamczyk
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Anna Stępień
- Faculty of Energy and Fuels, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
- AGH Centre of Energy, AGH University of Science and Technology, ul. Czarnowiejska 36, 30-054 Krakow, Poland
| | - Marek Zajusz
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Karolina Bar
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Katarzyna Berent
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Konrad Świerczek
- Faculty of Energy and Fuels, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
- AGH Centre of Energy, AGH University of Science and Technology, ul. Czarnowiejska 36, 30-054 Krakow, Poland
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Correlation between Structural and Transport Properties of Ca-Doped La Nickelates and Their Electrochemical Performance. CRYSTALS 2021. [DOI: 10.3390/cryst11030297] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This work presents the results from a study of the structure and transport properties of Ca-doped La2NiO4+δ. La2−xCaxNiO4+δ (x = 0–0.4) materials that were synthesized via combustion of organic-nitrate precursors and characterized by X-ray diffraction (XRD), in situ XRD using synchrotron radiation, thermogravimetric analysis (TGA) and isotope exchange of oxygen with C18O2. The structure was defined as orthorhombic (Fmmm) for x = 0 and tetragonal (I4/mmm) for x = 0.1–0.4. Changes that occurred in the unit cell parameters and volume as the temperature changed during heating were shown to be caused by the excess oxygen loss. Typical for Ruddlesden–Popper phases, oxygen mobility and surface reactivity decreased as the Ca content was increased due to a reduction in the over-stoichiometric oxygen content with the exception of x = 0.1. This composition demonstrated its superior oxygen transport properties compared to La2NiO4+δ due to the enhanced oxygen mobility caused by structural features. Electrochemical data obtained showed relatively low polarization resistance for the electrodes with a low Ca content, which correlates well with oxygen transport properties.
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Muñoz Gil D, Boulahya K, Santamaria Santoyo M, Azcondo MT, Amador U. Superior Performance as Cathode Material for Intermediate-Temperature Solid Oxide Fuel Cells of the Ruddlesden-Popper n = 2 Member Eu 2SrCo 0.50Fe 1.50O 7-δ with Low Cobalt Content. Inorg Chem 2021; 60:3094-3105. [PMID: 33586955 DOI: 10.1021/acs.inorgchem.0c03391] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effects of the contents of iron and cobalt on the crystal structure, oxygen content, thermal expansion coefficient, and electrical-electrochemical properties of materials Eu2SrCoxFe2-xO7-δ (x = 0.50 and 1.00) are reported. These oxides are well-ordered new members of the Ruddlesden-Popper series (Eu,Sr)n+1(Co,Fe)nO3n+1 system with n = 2 as determined by selected area electron diffraction and high-resolution transmission electron microscopy and X-ray diffraction studies. The two materials are semiconductors of p-type, with much higher total conductivity under working conditions for the low cobalt compound, Eu2SrCo0.50Fe1.50O7-δ. Composite cathodes prepared with this oxide present much lower area-specific resistance values (0.08 Ω·cm2 at 973 K in air) than composites containing Eu2SrCo1.00Fe1.00O7-δ (1.15 Ω·cm2). This significant difference is related to the much higher total conductivity and a sufficiently high content of oxygen vacancies in the Fe-rich phase. The excellent electrochemical performance of Eu2SrCo0.50Fe1.50O7-δ with low cobalt content, which shows one of the lowest area-specific resistance reported so far for a Ruddlesden-Popper oxide, makes it a good candidate for application as a cathode material for solid oxide fuel cells at intermediate temperatures in real devices.
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Affiliation(s)
- Daniel Muñoz Gil
- Instituto de Cerámica y Vidrio, CSIC, Cantoblanco, 28049 Madrid, Spain
| | - Khalid Boulahya
- Departamento de Química Inorgánica, Facultad Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain
| | - María Santamaria Santoyo
- Departamento de Química Inorgánica, Facultad Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain
| | - M Teresa Azcondo
- Facultad de Farmacia, Departamento de Química y Bioquímica, Urbanización Montepríncipe, Universidad San Pablo-CEU, CEU Universities, Boadilla del Monte, E-28668 Madrid, Spain
| | - Ulises Amador
- Facultad de Farmacia, Departamento de Química y Bioquímica, Urbanización Montepríncipe, Universidad San Pablo-CEU, CEU Universities, Boadilla del Monte, E-28668 Madrid, Spain
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Yuan M, Dong W, Wei L, Liu Q, Meng Y, Wang X, Wang B, Zhu B. Stability study of SOFC using layered perovskite oxide La1·85Sr0·15CuO4 mixed with ionic conductor as membrane. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2019.135487] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Rioja-Monllor L, Bernuy-Lopez C, Fontaine ML, Grande T, Einarsrud MA. Compositional Engineering of a La 1-xBa xCoO 3-δ-(1- a) BaZr 0.9Y 0.1O 2.95 ( a = 0.6, 0.7, 0.8 and x = 0.5, 0.6, 0.7) Nanocomposite Cathodes for Protonic Ceramic Fuel Cells. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E3441. [PMID: 31640202 PMCID: PMC6829304 DOI: 10.3390/ma12203441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 10/14/2019] [Accepted: 10/17/2019] [Indexed: 11/23/2022]
Abstract
Compositionally engineered a La1-xBaxCoO3-δ-(1-a) BaZr0.9Y0.1O2.95 (a = 0.6, 0.7, 0.8 and x = 0.5, 0.6, 0.7) (LBZ) nanocomposite cathodes were prepared by oxidation driven in situ exsolution of a single-phase material deposited on a BaZr0.9Y0.1O2.95 electrolyte. The processing procedure of the cathode was optimized by reducing the number of thermal treatments as the single-phase precursor was deposited directly on the electrolyte. The exsolution and firing of the cathodes occurred in one step. The electrochemical performance of symmetrical cells with the compositionally engineered cathodes was investigated by impedance spectroscopy in controlled atmospheres. The optimized materials processing gave web-like nanostructured cathodes with superior electrochemical performance for all compositions. The area specific resistances obtained were all below 12 Ω·cm2 at 400 °C and below 0.59 Ω·cm2 at 600 °C in 3% moist synthetic air. The resistances of the nominal 0.6 La0.5Ba0.5CoO3-δ-0.4 BaZr0.9Y0.1O2.95 and 0.8 La0.5Ba0.5CoO3-δ-0.2 BaZr0.9Y0.1O2.95 composite cathodes were among the lowest reported for protonic ceramic fuel cells cathodes in symmetrical cell configuration with ASR equal to 4.04 and 4.84 Ω·cm2 at 400 °C, and 0.21 and 0.27 Ω·cm2 at 600 °C, respectively.
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Affiliation(s)
- Laura Rioja-Monllor
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, 7491 Trondheim, Norway.
| | - Carlos Bernuy-Lopez
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, 7491 Trondheim, Norway.
| | | | - Tor Grande
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, 7491 Trondheim, Norway.
| | - Mari-Ann Einarsrud
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, 7491 Trondheim, Norway.
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High-Performance La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr1−zYzO3−δ Cathode Composites via an Exsolution Mechanism for Protonic Ceramic Fuel Cells. INORGANICS 2018. [DOI: 10.3390/inorganics6030083] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A novel exsolution process was used to fabricate complex all-oxide nanocomposite cathodes for Protonic Ceramic Fuel Cells (PCFCs). The nanocomposite cathodes with La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr1−zYzO3−δ nominal composition were prepared from a single-phase precursor via an oxidation-driven exsolution mechanism. The exsolution process results in a highly nanostructured and intimately interconnected percolating network of the two final phases, one proton conducting (BaZr1−zYzO3−δ) and one mixed oxygen ion and electron conducting (La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ), yielding excellent cathode performance. The cathode powder is synthesized as a single-phase cubic precursor by a modified Pechini route followed by annealing at 700 °C in N2. The precursor phase is exsolved into two cubic perovskite phases by further heat treatment in air. The phase composition and chemical composition of the two phases were confirmed by Rietveld refinement. The electrical conductivity of the composites was measured and the electrochemical performance was determined by impedance spectroscopy of symmetrical cells using BaZr0.9Y0.1O2.95 as electrolyte. Our results establish the potential of this exsolution method where a large number of different cations can be used to design composite cathodes. The La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr0.9Y0.1O2.95 composite cathode shows the best performance of 0.44 Ω∙cm2 at 600 °C in 3% moist synthetic air.
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Kravchenko E, Neagu A, Zakharchuk K, Grins J, Svensson G, Pankov V, Yaremchenko AA. High‐Temperature Structural and Electrical Characterization of Reduced Oxygen‐Deficient Ruddlesden–Popper Nickelates. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ekaterina Kravchenko
- CICECO ‐ Aveiro Institute of Materials Department of Materials and Ceramic Engineering University of Aveiro 3810‐193 Aveiro Portugal
- Department of Chemistry Belarusian State University Leningradskaya 14 220006 Minsk Belarus
| | - Alexandra Neagu
- Department of Materials and Environmental Chemistry Stockholm University 106 91 Stockholm Sweden
| | - Kiryl Zakharchuk
- CICECO ‐ Aveiro Institute of Materials Department of Materials and Ceramic Engineering University of Aveiro 3810‐193 Aveiro Portugal
| | - Jekabs Grins
- Department of Materials and Environmental Chemistry Stockholm University 106 91 Stockholm Sweden
| | - Gunnar Svensson
- Department of Materials and Environmental Chemistry Stockholm University 106 91 Stockholm Sweden
| | - Vladimir Pankov
- Department of Chemistry Belarusian State University Leningradskaya 14 220006 Minsk Belarus
| | - Aleksey A. Yaremchenko
- CICECO ‐ Aveiro Institute of Materials Department of Materials and Ceramic Engineering University of Aveiro 3810‐193 Aveiro Portugal
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Wang J, Zhou J, Fan W, Wang W, Wu K, Cheng Y. Investigation of structural and electrochemical properties of LaSrCo 1−x Sb x O 4 (0≤x≤0.20) as potential cathode materials in intermediate-temperature solid oxide fuel cells. J SOLID STATE CHEM 2017. [DOI: 10.1016/j.jssc.2016.11.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kravchenko E, Zakharchuk K, Viskup A, Grins J, Svensson G, Pankov V, Yaremchenko A. Impact of Oxygen Deficiency on the Electrochemical Performance of K 2 NiF 4 -Type (La 1-x Sr x ) 2 NiO 4-δ Oxygen Electrodes. CHEMSUSCHEM 2017; 10:600-611. [PMID: 27860352 DOI: 10.1002/cssc.201601340] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2016] [Revised: 10/31/2016] [Indexed: 06/06/2023]
Abstract
Perovskite-related (La1-x Srx )2 NiO4-δ (x=0.5-0.8) phases were explored for possible use as oxygen electrodes in solid electrolyte cells with a main focus on the effect of oxygen deficiency on the electrocatalytic activity. (La1-x Srx )2 NiO4-δ solid solutions were demonstrated to preserve the K2 NiF4 -type tetragonal structure under oxidizing conditions. Acceptor-type substitution by Sr is compensated by the formation of oxygen vacancies and electron holes and progressively increases high-temperature oxygen nonstoichiometry, which reaches as high as δ=0.40 for x=0.8 at 950 °C in air. The electrical conductivity of (La1-x Srx )2 NiO4-δ ceramics at 500-1000 °C and p(O2 )≥10-3 atm is p-type metallic-like. The highest conductivity, 300 S cm-1 at 800 °C in air, is observed for x=0.6. The average thermal expansion coefficients, (14.0-15.4)×10-6 K-1 at 25-900 °C in air, are sufficiently low to ensure the thermomechanical compatibility with common solid electrolytes. The polarization resistance of porous (La1-x Srx )2 NiO4-δ electrodes applied on a Ce0.9 Gd0.1 O2-δ solid electrolyte decreases with increasing Sr concentration in correlation with the concentration of oxygen vacancies in the nickelate lattice and the anticipated level of mixed ionic-electronic conduction. However, this is accompanied by increasing reactivity between the cell components and necessitates the microstructural optimization of the electrode materials to reduce the electrode fabrication temperature.
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Affiliation(s)
- Ekaterina Kravchenko
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193, Aveiro, Portugal
- Department of Chemistry, Belarusian State University, Leningradskaya 14, 220006, Minsk, Belarus
| | - Kiryl Zakharchuk
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Alexander Viskup
- Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya 14, 220006, Minsk, Belarus
| | - Jekabs Grins
- Department of Materials and Environmental Chemistry, Stockholm University, 106 91, Stockholm, Sweden
| | - Gunnar Svensson
- Department of Materials and Environmental Chemistry, Stockholm University, 106 91, Stockholm, Sweden
| | - Vladimir Pankov
- Department of Chemistry, Belarusian State University, Leningradskaya 14, 220006, Minsk, Belarus
| | - Aleksey Yaremchenko
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193, Aveiro, Portugal
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Fabrication and electrochemical characterizations of Nd2NiO4+δ-Ce0.8Gd0.2O2−δ composite cathodes for anode-supported intermediate temperature solid oxide fuel cells. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.07.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Myung JH, Hong YW, Lee MJ, Jeon DW, Lee YJ, Hwang J, Shin TH, Paik JH. Structural and electrochemical characterization of K 2NiF 4type layered perovskite as cathode for SOFCs. JOURNAL OF THE KOREAN CRYSTAL GROWTH AND CRYSTAL TECHNOLOGY 2015. [DOI: 10.6111/jkcgct.2015.25.3.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kawamura K, Yashima M, Fujii K, Omoto K, Hibino K, Yamada S, Hester JR, Avdeev M, Miao P, Torii S, Kamiyama T. Structural origin of the anisotropic and isotropic thermal expansion of K2NiF4-Type LaSrAlO4 and Sr2TiO4. Inorg Chem 2015; 54:3896-904. [PMID: 25833295 DOI: 10.1021/acs.inorgchem.5b00102] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
K2NiF4-type LaSrAlO4 and Sr2TiO4 exhibit anisotropic and isotropic thermal expansion, respectively; however, their structural origin is unknown. To address this unresolved issue, the crystal structure and thermal expansion of LaSrAlO4 and Sr2TiO4 have been investigated through high-temperature neutron and synchrotron X-ray powder diffraction experiments and ab initio electronic calculations. The thermal expansion coefficient (TEC) along the c-axis (αc) being higher than that along the a-axis (αa) of LaSrAlO4 [αc = 1.882(4)αa] is mainly ascribed to the TEC of the interatomic distance between Al and apical oxygen O2 α(Al-O2) being higher than that between Al and equatorial oxygen O1 α(Al-O1) [α(Al-O2) = 2.41(18)α(Al-O1)]. The higher α(Al-O2) is attributed to the Al-O2 bond being longer and weaker than the Al-O1 bond. Thus, the minimum electron density and bond valence of the Al-O2 bond are lower than those of the Al-O1 bond. For Sr2TiO4, the Ti-O2 interatomic distance, d(Ti-O2), is equal to that of Ti-O1, d(Ti-O1) [d(Ti-O2) = 1.0194(15)d(Ti-O1)], relative to LaSrAlO4 [d(Al-O2) = 1.0932(9)d(Al-O1)]. Therefore, the bond valence and minimum electron density of the Ti-O2 bond are nearly equal to those of the Ti-O1 bond, leading to isotropic thermal expansion of Sr2TiO4 than LaSrAlO4. These results indicate that the anisotropic thermal expansion of K2NiF4-type oxides, A2BO4, is strongly influenced by the anisotropy of B-O chemical bonds. The present study suggests that due to the higher ratio of interatomic distance d(B-O2)/d(B-O1) of A2(2.5+)B(3+)O4 compared with A2(2+)B(4+)O4, A2(2.5+)B(3+)O4 compounds have higher α(B-O2), and A2(2+)B(4+)O4 materials exhibit smaller α(B-O2), leading to the anisotropic thermal expansion of A2(2.5+)B(3+)O4 and isotropic thermal expansion of A2(2+)B(4+)O4. The "true" thermal expansion without the chemical expansion of A2BO4 is higher than that of ABO3 with a similar composition.
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Affiliation(s)
| | | | | | | | | | | | - James R Hester
- §Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Maxim Avdeev
- §Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Ping Miao
- #Neutron Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - Shuki Torii
- #Neutron Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - Takashi Kamiyama
- #Neutron Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.,⊥The Graduate University for Advanced Studies (SOKENDAI), SOKENDAI-KEK Office, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
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Kulichenko V, Nedilko S, Dziazko O, Chornovol V. A study of nonstoichiometric oxides in the Ln-Ni-O (Ln=La, Pr, Nd) system. FRENCH-UKRAINIAN JOURNAL OF CHEMISTRY 2015. [DOI: 10.17721/fujcv3i2p89-92] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The non-stoichiometric compositions Ln2-xNiO4-3x/2+d (Ln=La, Pr, Nd, 0£x£0,4) were obtained using coprecipitation method from nitrates solutions by K2CO3 followed by calcination of the obtained blend at 950°С. According to X-ray phase analysis compositions in the range La2NiO4.17 – La1.6NiO3.63 are monophase and crystallize in tetragonal symmetry K2NiF4, space group I4/mmm. Nd2-xNiO4-y and Pr2-xNiO4-y in the range 0£x£0,2 are monophase and have orthorombic and monoclinic(correspodingly) distorted K2NiF4 structure. Samples with 0,2<x£0,4 are polyphase and contain Ln2NiO4 (Ln=Pr, Nd), NiO and rare earth oxides. Electrical conductivity of obtained samples have semiconducting behavior and it is strong depended to nonstoichiometric oxygen content.
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Inprasit T, Wongkasemjit S, Skinner SJ, Burriel M, Limthongkul P. Effect of Sr substituted La2−xSrxNiO4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties. RSC Adv 2015. [DOI: 10.1039/c4ra11672k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mixed effects of reduction of oxygen excess and increasing valence of Ni were found as charge compensation mechanisms for Sr substituted La2−xSrxNiO4+δ (x = 0.2 to 0.8). The highest oxygen diffusivity was found for x = 0.2, with an unusual increase when x = 0.8.
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Affiliation(s)
- T. Inprasit
- The Petroleum and Petrochemical College
- Chulalongkorn University
- Bangkok
- Thailand
| | - S. Wongkasemjit
- The Petroleum and Petrochemical College
- Chulalongkorn University
- Bangkok
- Thailand
- Center of Excellence for Petroleum
| | - S. J. Skinner
- Department of Materials
- Imperial College London
- London SW7 2AZ
- UK
| | - M. Burriel
- Department of Materials
- Imperial College London
- London SW7 2AZ
- UK
- Catalonia Institute for Energy Research (IREC)
| | - P. Limthongkul
- National Metal and Materials Technology Center
- National Science and Development Agency
- Khlong Luang
- Thailand
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Fabrication and characterization of BaCe0.8Y0.2O2.9-Ce0.85Sm0.15O1.925 composite electrolytes for IT-SOFCs. Sci China Chem 2014. [DOI: 10.1007/s11426-014-5176-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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Sadykov VA, Eremeev NF, Usol’tsev VV, Bobin AS, Alikina GM, Pelipenko VV, Sadovskaya EM, Muzykantov VS, Bulgakov NN, Uvarov NF. Mechanism of oxygen transfer in layered lanthanide nickelates Ln2 − x NiO4 + δ (Ln = La, Pr) and their nanocomposites with Ce0.9Gd0.1O2 − δ and Y2(Ti0.8Zr0.2)1.6Mn0.4O7 − δ solid electrolytes. RUSS J ELECTROCHEM+ 2013. [DOI: 10.1134/s1023193513070136] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Grimaud A, Mauvy F, Marc Bassat J, Fourcade S, Marrony M, Claude Grenier J. Hydration and transport properties of the Pr2−xSrxNiO4+δ compounds as H+-SOFC cathodes. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31812a] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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