Synthesis of layered compounds based on differences in compressibility

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22230
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Takafumi Yamamoto 東京工業大学, 科学技術創成研究院, 准教授 (80650639)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 高圧 / 圧縮率 / 層状構造 / 複合アニオン

Outline of Final Research Achievements

In recent years, the synthesis of inorganic compounds using pressures above 1 GPa has become common, but there are no clear guidelines as to what kind of compounds can be synthesized at high pressures. In this study, we focused on the parameter of ionic compressibility (i.e., hardness/softness) to clarify the behavior of compounds under high pressure and their stable structures. Specifically, we focused on the softness of pnictides and hydrides compared to oxide ions, and clarified phase transitions and synthesis methods under high pressure in mixed anionic compounds.

Free Research Field

固体化学

Academic Significance and Societal Importance of the Research Achievements

本研究ではヒドリドの柔らかさに着目した酸水素化物の秩序/無秩序構造の安定化メカニズム関して、理論と合成の両面からアプローチし、その設計指針を明らかにした。また酸化物イオンに比べてニクタイドやヒドリドが柔らかいことに着目して、高圧下での構造相転移を見出した。このような研究は、近年一般的な合成法になりつつある、GPaオーダーの合成法に関する物質の設計指針や、高圧下での物性制御の指針となるものであり、将来的な新物質探索や新物性探索につながる結果である。