From the XRD data,we obtained the attice parameters and the unit cell volume for the two structures as a function of pressure for the decompression sequence.There is good agreement between the experimental and theoretical equations of state for both NaCl3 structures(Fig.4C).Also,in agreement with the theoretical predictions,we fing that two new nacl3 phases transform from one to the other upon pressure release at 300K,although the transform is sluggish and there is a large range of phase coexistence Pnma-nacl3,remains metastable at pressures as low as 18 Gpa and decomposes to nacl ang cl2 at lower pressures.
从XRD数据，我们得到的晶格参数和晶胞体积的两个结构作为减压的序列的压力的函数。有实验和理论两个nacl3结构状态方程之间的良好的一致（fig.4c）。同时，与理论的预测一致，我们发现，两个新的nacl3相位变换从一个到另一个在300K，压力释放，虽然转变是缓慢的，有一个大范围的pnma-nacl3亚稳相共存，仍然在低压力18 GPa和分解氯化钠和氯气在较低的压力。