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High pressure behaviors and novel high-pressure phase of Si3N4 and TiN
Lithos ( IF 3.5 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.lithos.2020.105677
Fei Qin , Shan Qin , Vitali B. Prakapenka

Abstract Here we present synchrotron-based X-ray diffraction experiments combined with diamond anvil cell on the nitrogen-bearing compounds Si3N4 and TiN up to ~53 GPa and ~51 GPa, respectively. The pressure-induced phase transition of Si3N4 is evidenced at 42.3 GPa at room temperature and a new monoclinic high-pressure phase assigned to the P2, Pm, or P2/m space group was observed. The pressure-volume relationship is well described by the third-order Birch-Murnaghan equation of state, which yields KT0 = 271(4) GPa and KT0′ = 4.3(2), and the anisotropic compression with Mc > Ma is obtained. While TiN is stable up to 50.8 GPa without any evidence of phase transformation. Our results provide more information on the stability and elastic properties of nitrogen-bearing minerals in the Earth's mantle, and thus provide new insights for understanding the nitrogen stability and transport properties in the deep earth.

中文翻译:

Si3N4 和 TiN 的高压行为和新型高压相

摘要 在这里,我们介绍了基于同步加速器的 X 射线衍射实验结合金刚石砧座对含氮化合物 Si3N4 和 TiN 分别进行了高达 ~53 GPa 和 ~51 GPa 的实验。Si3N4 的压力诱导相变在室温下在 42.3 GPa 下得到证明,并且观察到分配给 P2、Pm 或 P2/m 空间群的新单斜高压相。压力-体积关系由三阶 Birch-Murnaghan 状态方程很好地描述,其产生 KT0 = 271(4) GPa 和 KT0' = 4.3(2),并且获得了 Mc > Ma 的各向异性压缩。而 TiN 在高达 50.8 GPa 的压力下是稳定的,没有任何相变迹象。我们的研究结果提供了更多关于地幔中含氮矿物的稳定性和弹性特性的信息,
更新日期:2020-11-01
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