Change in compressibility of MOOH oxyhydroxide at high pressure

MOOH水酸化物における高圧下での圧縮挙動の変化

佐野 亜沙美   ; 八木 健彦*; 鍵 裕之*; 永井 隆哉*; 小松 一生*

Sano, Asami; Yagi, Takehiko*; Kagi, Hiroyuki*; Nagai, Takaya*; Komatsu, Kazuki*

Applying pressure to linear hydrogen bond induces the decrease of O...O distances and the formation of a strong hydrogen bond. InOOH type MOOH (M = Al, Cr, Fe, Ga...) with distorted rutile type structure is one of the densest polymorph among oxyhydroxide, and has a strong hydrogen bond even at ambient conditions. In -AlOOH, theoretical studies have predicted that a symmetric hydrogen bond would be formed at high pressure. To investigate experimentally the symmetrization in MOOH oxyhydroxide, we conducted (1) neutron diffraction experiment of -AlOOD and (2) compression experiment on various MOOH oxyhydroxide (M = Al, Ga, In, Cr). Combining these results, I will discuss the relation between the change in compression behavior of MOOH and the symmetrization of hydrogen bond.