Phase transitions of ScOOH under high pressure
Phase transitions of ScOOH under high pressure
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DOI：
10.1080/08957959.2021.1964495
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发表时间：
2021-07
影响因子：
2
通讯作者：
Yoshiaki Ito;O. Ikeda;Rintaro Ban;T. Kubota;T. Sakamaki;T. Kuribayashi;A. Suzuki
中科院分区：
文献类型：
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作者：
Yoshiaki Ito;O. Ikeda;Rintaro Ban;T. Kubota;T. Sakamaki;T. Kuribayashi;A. Suzuki
摘要为了了解ScOOH的相变过程，在11 GPa和900 K的高压和高温条件下对ScOOH进行了原位X射线衍射测量。随着压力的增加，观察到α-ScOOH、InOOH型ScOOH和YbOOH型ScOOH。实验结果表明，α-ScOOH与InOOH型ScOOH、InOOH型ScOOH与YbOOH型ScOOH之间的分界线可用下列线性方程表示：P（GPa）=（0.0009 ± 0.0015）× [T（K）- 700] + 4.33 ± 0.04; P（GPa）=（-0.0029 ± 0.0002）× [T（K）- 800] + 8.1 ± 0.3。采用二阶Birch-Murnaghan状态方程（EoS）对实验数据进行最小二乘拟合，得到了400 K下ScOOH三相的EoS参数。在4GPa和400 K下，α-ScOOH向InOOH型ScOOH转变的体积变化为1.39%;在9 GPa和400 K下，InOOH向YbOOH型ScOOH转变的体积变化为1.76%。
ABSTRACT In-situ X-ray diffraction measurements of ScOOH were conducted under high pressure and temperature conditions up to 11 GPa and 900 K to understand its phase transitions. As the pressure increased, α-ScOOH, InOOH-type ScOOH, and YbOOH-type ScOOH were observed. The experimental results indicate that the boundaries between α-ScOOH and InOOH-type ScOOH, and between InOOH-type and YbOOH-type ScOOH are represented by the following linear equations: P(GPa) = (0.0009 ± 0.0015) × [T(K) – 700] + 4.33 ± 0.04 and P(GPa) = (–0.0029 ± 0.0002) × [T(K) – 800] + 8.1 ± 0.3, respectively. By using a least-squares fit of the second-order Birch–Murnaghan equation of state (EoS) to the experimental compression data, the EoS parameters of the three phases of ScOOH at 400 K were obtained. The volume change of the transition from α-ScOOH to InOOH-type ScOOH is ∼3.9% at 4 GPa and 400 K, while the volume change of the transition from InOOH-type to YbOOH-type ScOOH is ∼7.6% at 9 GPa and 400 K.