P-V-T equation of state of α-ScOOH
P-V-T equation of state of α-ScOOH
复制标题
α-ScOOH的P-V-T状态方程
DOI：
10.1080/08957959.2022.2089568
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发表时间：
2022
影响因子：
2
通讯作者：
Suzuki Akio
中科院分区：
文献类型：
--
作者：
Ito Yoshiaki;Ikeda Osamu;Sakamaki Tatsuya;Kuribayashi Takahiro;Suzuki Akio
在本研究中，在压力和温度分别高达4.12 GPa和700 K的条件下，对α-ScOOH（具有一水硬铝石型结构的羟基氧化钪）进行了原位X射线衍射研究，以确定压力-体积-温度（P-V-T）状态方程（EoS）。 使用二阶Birch-Murnaghan EoS与P-V-T数据的最小二乘拟合，α-ScOOH的EoS参数被确定为体积模量KT 0 = 101（1）GPa，（KKT/KKT）P= −0.009（5）GPa K−1，零压热膨胀系数α = 3.12（6）10− 5 K −1。α-ScOOH具有各向异性的压缩和热膨胀行为，这与前人对一水硬铝石型羟基氧化物的研究结果一致。α-ScOOH比其它一水硬铝石型羟基氧化物更易压缩，体积模量与体积的乘积在一水硬铝石型M3 +OOH（M = Al，Sc，Fe）中近似为常数。
In this study, an in situ X-ray diffraction study of α-ScOOH, scandium oxyhydroxide with a diaspore-type structure, was conducted at a pressure and temperature of up to 4.12 GPa and 700 K, respectively, to determine the pressure-volume-temperature (P-V-T) equation of state (EoS). Using a least-squares fit of the second-order Birch–Murnaghan EoS to theP-V-Tdata, the EoS parameters of α-ScOOH were determined as bulk modulusKT0= 101(1) GPa, (∂KT/∂T)P= −0.009(5) GPa K−1, and thermal expansion coefficient at zero pressure α = 3.12(6) 10−5K−1. α-ScOOH exhibits anisotropic compression and thermal expansion behaviors, which are consistent with those of previous studies on diaspore-type oxyhydroxides. α-ScOOH is more compressible than other diaspore-type oxyhydroxides, and the product of the bulk modulus and volume is approximately constant among diaspore-type M3 +OOH (M = Al, Sc, and Fe).