[R3-09] Compressibility and blue-shifting OH groups of Mg(OH)F under high pressure | 一般社団法人日本鉱物科学会2021年年会・総会

一般社団法人日本鉱物科学会2021年年会・総会

2021年9月15日〜9月19日オンライン開催

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一般社団法人日本鉱物科学会2021年年会・総会

2021年9月15日〜9月19日オンライン開催

[R3-09]Compressibility and blue-shifting OH groups of Mg(OH)F under high pressure

*Xuejing He¹, Hiroyuki Kagi¹, Kazuki Komatsu¹, Satoshi Nakano²(1. UTokyo, 2. NIMS)

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In-situ high-pressure synchrotron XRD and FTIR experiments have been conducted up to ~20 GPa at room temperature using DACs, to investigate compressibility and spectroscopic properties of Mg(OH)F (Pnma, Z = 4). The P-V correlation is fitted by the 2nd-order Birch-Murnaghan Equation of State, yielding K₀ = 80(2) GPa, K₀' = 4.0 (fixed), and V₀ = 145.2(3) cubic anstrom. Positive pressure dependence of the O-H stretching mode frequencies indicates that the O-H...F hydrogen-bond does not strengthen under compression.

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