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.
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