In-situ X-ray diffraction study on β-CrOOH at high pressure and high-temperature. Issue 3 (3rd July 2019)

• Record Type: Journal Article
• Authors: Shito, Chikara; Okamoto, Keitaro; Sato, Yuki; Watanabe, Ryuji; Ohashi, Tomonori; Fuchizaki, Kazuhiro; Kuribayashi, Takahiro; Suzuki, Akio
• Is Part Of: High pressure research. Volume 39:Issue 3(2019)
• Page Start: 499
• Page End: 508
• Publication Date: 2019-07-03
• Subjects: β-CrOOH -- Birch–Murnaghan equation of state -- X-ray diffraction -- hydrogen bond; High pressure (Science) -- Periodicals; High pressure (Technology) -- Periodicals; 536.41
• DOI: 10.1080/08957959.2019.1642884
• Languages: English
• ISSNs: 0895-7959

Abstract

ABSTRACT: High pressure hydrous phases with distorted rutile-type structure have attracted much interest as potential water reservoirs in the Earth's mantle. An in-situ X-ray diffraction study of β-CrOOH was performed at high pressures of up to 6.2 GPa and high-temperatures of up to 700 K in order to clarify the temperature effect on compression behaviors of β-CrOOH. The P - V - T data fitted to a Birch–Murnaghan equation of state yielded the following results: isothermal bulk modulus K T0 = 191(4) GPa, temperature derivative (∂ K T /∂ T )P = −0.04(2) GPa K −1, and volumetric thermal expansion coefficient α = 3.3(2) × 10 −5 K −1 . In this study, at 300 K, the a -axis became less compressible at pressures above 1–2 GPa. We found that the pressure where the slopes of a / b and a / c ratios turned positive increased with temperature. This is the first experimental study indicating the temperature dependence of the change in the axial compressibility in distorted rutile-type M 3+ OOH.