Study of the oxygen-ion mobility in complex metal-oxide materials prepared by topochemical methods

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23650
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0502:Inorganic/coordination chemistry, analytical chemistry, inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Kyoto University
• Principal Investigator: Amano Patino Midori (Estefani) (Estefani) 京都大学, 化学研究所, 特定助教 (80849018)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: Oxygen-ion mobility / Perovskite structure / Solid state chemistry / Topochemical methods / Structural study / Synchrotron radiation / Rietveld refinement

Outline of Final Research Achievements

This project investigated the synthesis and characterization of metal-oxide materials prepared by topochemical (structure preserving) methods. The products of topochemical processes often exhibit oxygen-ion conductivity at moderate temperatures (T < 900 °C). A series of perovskite and perovskite-related materials were successfully prepared by using a combination of reductive/oxidative atmospheres coupled with heating and pressure treatments. The materials exhibit markedly different types of cation and/or vacancy ordering. Their detailed structure and oxygen release/incorporation behavior as a function of temperature were analyzed by synchrotron X-ray diffraction and thermogravimetric techniques.

Free Research Field

0502:無機・錯体化学、分析化学、無機材料化学、エネルギー関連化学およびその関連分野

Academic Significance and Societal Importance of the Research Achievements

近年、新しいクリーンエネルギー源や高エネルギー密度の電池の必要性が高まっており、それらの開発のために特に中低温で動作する新しいイオン伝導材料の研究が盛んに行われている。酸素イオン伝導体は、固体酸化物燃料電池（SOFC）などのデバイスに使用されるキーマテリアルである。本研究の成果は、酸素イオン伝導材料のバリエーションを拡げ、また、構造的特徴を活かすことで酸素イオン伝導を制御する可能性を示すもので、持続可能な社会を支えるSOFC技術を開発することにも繋がります。