Pressure-induced phase transition of lead phosphate Pb3(PO4)2: X-ray diffraction and XANES

Fei Qin, Xiang Wu, Shuangmeng Zhai, Shan Qin, Ke Yang, Dongliang Chen, Yanchun Li

Research output: Contribution to journalArticle (Academic Journal)peer-review


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 (C2/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 V0 = 533(1) Å3, K0 = 89(4) GPa and K0 = 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, i.e. the first-shell coordination number of Pb1 changes from 9 to 12 and the average Pb–O bond length increases at the crossover of C2/c-to- phase transition.
Original languageEnglish
Pages (from-to)1255-1264
Number of pages10
JournalPhase Transitions
Issue number12
Early online date26 Sep 2014
Publication statusPublished - Dec 2014

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