2021 Fiscal Year Final Research Report

Control of oxygen deficiency beyond thermodynamic constraints using solid state electrochemistry

Research Project

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Project/Area Number	20K22544
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	Hokkaido University
Principal Investigator	Iwasaki Suguru 北海道大学, 電子科学研究所, 博士研究員 (30888136)
Project Period (FY)	2020-09-11 – 2022-03-31
Keywords	異方的イオン拡散制御 / 化学ポテンシャル / 固体電気化学 / 酸素欠損
Outline of Final Research Achievements	This study developed Anisotropic ion Diffusion Control (ADC) method that enables the synthesis of metastable phase by controlling specific ion spices in solid framework. Owing to ADC method, Na extraction from Na-Si clathrate (Na24Si136) with cage-like framework of Si was achieved. Additionally, O removal from a mixed-anion layered compound Sr2VFeAsO3-d, known as iron-based superconductor, was also achieved, which resulted in modulating its superconducting transition temperature. ADC method is expected to be an synthetic tool to discover novel compounds.
Free Research Field	材料科学
Academic Significance and Societal Importance of the Research Achievements	現在、我々の身の回りには金属・半導体・絶縁体・磁性体・イオン伝導体といった様々な機能を有する材料が存在する。このような機能が我々の生活を豊かにする。したがって、我々の生活を豊かにするためには様々な機能性材料の開発が不可欠である。本研究で開発された異方的イオン拡散制御(Anisotropic ion Diffusion Control, ADC)法は機能性材料の新たな合成手法であり、今後、新規機能性材料が発見されていくと期待される。