MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Special Issue on Metallurgy for Advanced Catalytic Materials
Syntheses of Novel Hydrides Containing Light Elements under High Pressure and High Temperature
Hiroyuki Saitoh
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2023 Volume 64 Issue 10 Pages 2400-2409

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Abstract

This paper describes high-pressure synthetic studies on novel hydrides. High-pressure hydrogenation experiments are carried out using a cubic-type multi-anvil apparatus. In-situ synchrotron radiation X-ray diffraction measurements are effectively used to explore synthetic conditions, to investigate the reaction mechanisms, and to characterize the thermodynamic stabilities of the obtained hydrides. Theoretical calculations based on first-principles calculations enable us to predict the thermal stability and crystal structure of the target hydrides before the high-pressure experiments, which leads to the rapid discovery of the novel hydrides. Lithium-containing hydrides, YLiFeH6, LiNiH3, Li4FeH6, and Li3AlFeH8 are synthesized. Syntheses of aluminum-based alloys hydrides, Al2CuH and Al3FeH4 under high-pressure are also described. These results demonstrate that the high-pressure technique is useful for discovering novel hydrides.

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