Pressure-induced phase transition of lead phosphate Pb-3(PO4)(2): X-ray diffraction and XANES
Pressure-induced phase transition of lead phosphate Pb-3(PO4)(2): X-ray diffraction and XANES
复制标题
磷酸铅 Pb-3(PO4)(2) 的压力诱导相变：X 射线衍射和 XANES
DOI：
10.1080/01411594.2014.953504
复制
发表时间：
2014
影响因子：
1.6
通讯作者：
Y.C. Li
中科院分区：
文献类型：
--
作者：
Fei Qin;X. Wu;S.M. Zhai;S. Qin;K. Yang;D.L. Chen;Y.C. Li
Lead phosphate Pb3 (PO4) 2 was investigated by in situ synchrotron radiation X-ray diffraction and X-ray absorption near-edge structure (XANES) combined with diamond anvil cell technique up to 60.9 GPa. A pressure-induced phase transition of Pb3 (PO4) 2 was observed from monoclinic (C 2/c) to trigonal () phases at about 1.7 GPa at room temperature. The high-pressure annealing experiment indicates that the trigonal phase of Pb3 (PO4) 2 is stable at least up to 60.9 GPa. Isothermal pressure–volume relationship of trigonal Pb3 (PO4) 2 is well described by the third-order Birch–Murnaghan equation of state with V 0= 533 (1) Å3, K 0= 89 (4) GPa and K 0′= 5.8 (2). In trigonal Pb3 (PO4) 2, the a-axis is more compressible than the c-axis, showing an anisotropy elasticity. XANES results reveal the evolution of Pb local environment, ie the first-shell coordination number of Pb1 changes from 9 to 12 and the average Pb–O bond length increases at the crossover of C 2/c-to-phase transition.
