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Observation of pressure-induced phase transition of $$delta$$-AlOOH by using single-crystal synchrotron X-ray diffraction method

Kuribayashi, Takahiro*; Sano, Asami   ; Nagase, Toshiro*

Pressure-induced phase transition of $$delta$$-AlOOH was confirmed between 6.1 and 8.2 GPa by using a single-crystal synchrotron X-ray diffraction method. The phase transition is reversible and unquenchable. The space group of the post-transition phase should be ${it Pnnm}$ or ${it Pnn}$2 to satisfy the systematic absence rule. Crystal structure refinements of the post-transition phase conducted for the three models (${it Pnnm}$, ${it Pnn}$2, and ${it P}$2$$_{1}$$${it nm}$) indicate that the space group of the post-transition phase is ${it Pnnm}$. The O-O distance of hydrogen bond in the post-transition phase at 8.2 GPa is 2.439(6) ${AA}$ and is significantly longer than the predicted distance (2.366 ${AA}$) of the hydrogen bond symmetrization in $$delta$$-AlOOH. The H distribution in the post-transition phase would display a fully disordered hydrogen bond pattern.

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Category:Materials Science, Multidisciplinary

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