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Updated: Feb 15, 2026

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
Control of Anion Ordering in Perovskite Oxyhydrides by High-Pressure and High-Temperature Treatment
Takafumi Yamamoto1,2, Haruki Tochizawa2, Teppei Nagase1,2
1Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyoku, Kyoto, 606-8502, Japan.
Abstract:
Crystallographic order-disorder transitions are of fundamental interest due to the intimate relationship between structure and properties, while controlling anion ordering in oxide-based compounds has been less achieved. Here, we report anion-order-disorder structural control in primitive perovskite oxyhydrides. Anion-disordered vanadium perovskite oxyhydride with cubic symmetry was obtained by quenching the sample from 1000 °C to room temperature within five minutes under high pressure, while anion-ordered ones with tetragonal symmetry emerge through slow cooling from 1000 °C over 10 hours. In addition, the sign of the order-disorder structural change was also found in chromium perovskite oxyhydride. This study presents a novel synthetic route to anion-ordered oxyhydrides, enabling the future achievement of desirable properties.
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