2020 Fiscal Year Annual Research Report
Study of the oxygen-ion mobility in complex metal-oxide materials prepared by topochemical methods
| Project/Area Number |
19K23650
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| Research Institution | Kyoto University |
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Principal Investigator |
AmanoPatino Midori (Estefani) 京都大学, 化学研究所, 特定助教 (80849018)
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| Project Period (FY) |
2019-08-30 – 2021-03-31
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| Keywords | Oxygen-ion mobility / Perovskite structure / Layered structures / Solid state synthesis / Topochemical processes / Structural study / Synchrotron radiation / Rietveld refinement |
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| Outline of Annual Research Achievements |
The focus of this project was to investigate metal oxides synthesized by topochemical (structure-preserving) methods, in the search of novel oxygen-ion conducting materials for applications at intermediate temperatures.
During FY2020, the full characterization of the series of perovskite and perovskite-related materials LaSrNiRuO4 (with different rates of Ni/Ru cation-ordering) and A-site mixed materials La1-xBaxMnO3-δ (x = 0.25, 0.50 with different types of oxide-vacancy ordering), were carried out. Synchrotron X-ray diffraction (SXRD) data collected at central facilities during FY2019 (NSRRC, Taiwan and SPring-8, Japan) were used in combination with reductive and/or oxidative thermogravimetric analysis (TGA) measurements, to reveal the oxygen-ion incorporation behaviour of the materials. Microstructural features during topochemical processes were confirmed to be key in the accessibility of the topochemical products.
Noting the impact of the microstructure of the materials in the mechanisms for the oxygen-ion mobility, the study was extended to layered perovskite phases. In particular, the so called Ruddlesden-Popper (RP) phases with general formula An+1BnO3n+1. The synthesis of the series Can+1MnnO3n+1 (n = 1, 2, 3) was carried out and SXRD (NSRRC, Taiwan and SPring-8, Japan) as well as and TGA data were collected for these materials.
The results are being prepared for publication.
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| Remarks |
Institute for Chemical Research (ICR), Kyoto University
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[Journal Article] Charge disproportionation and interchange transitions in twelve-layer BaFeO32020
Author(s)
Zhenhong Tan, Fabio Denis Romero, Takashi Saito, Masato Goto, Midori Amano Patino, Anucha Koedtruad, Yoshihisa Kosugi, Wei-Tin Chen, Yu-Chun Chuang, Hwo-Shuenn Sheu, J Paul Attfield, Yuichi Shimakawa
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Journal Title
Physical Review B
Volume: 102
Pages: 54404-1-7
DOI
Peer Reviewed / Int'l Joint Research
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