ABSTRACT We report experimental determination of compressibility and thermoelasticity for CrN based on in situ high pressure/high temperature synchrotron x-ray diffraction measurements. The pressure-induced cubic-to-orthorhombic phase transition is observed at ∼ 5 GPa in high-quality CrN samples synthesized using a high pressure reaction route. Equation of state, bulk modulus and axial compressibility of this material are obtained by analysis of high pressure x-ray diffraction data collected at room temperature. Both cubic and orthorhombic phases have a similar bulk modulus value of 257 (5) and 262 (6) GPa, respectively. For orthorhombic CrN, the b-axis has the most axial incompressibility, which should be associated with magnetic properties. In addition, the isothermal equation of states is also determined at different temperatures of 300, 400, 600, 800, 1000, and 1200 K, respectively. Some of the important thermoelastic properties of cubic CrN are thus derived, including temperature derivative of bulk modulus and volumetric thermal expansivity where a 0 = 1.95 (16) × 10−5 K−1 and a 1 = 4.39 (3) × 10−9 K−1.

中文翻译：

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CrN的压缩性和热弹性

摘要 我们报告了基于原位高压/高温同步加速器 X 射线衍射测量的 CrN 压缩性和热弹性的实验测定。在使用高压反应路线合成的高质量 CrN 样品中，在约 5 GPa 处观察到压力诱导的立方到正交相变。这种材料的状态方程、体积模量和轴向压缩率是通过分析在室温下收集的高压 X 射线衍射数据获得的。立方相和正交相具有相似的体积模量值，分别为 257 (5) 和 262 (6) GPa。对于正交晶系 CrN，b 轴具有最大的轴向不可压缩性，这应该与磁性有关。此外，等温状态方程也在300、400、分别为 600、800、1000 和 1200 K。由此推导出立方 CrN 的一些重要热弹性特性，包括体积模量和体积热膨胀系数的温度导数，其中 a 0 = 1.95 (16) × 10−5 K−1 和 a 1 = 4.39 (3) × 10−9 K-1。