| 研究実績の概要 |
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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