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

doi:10.1080/01411594.2014.953504

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

School of Earth Sciences

Research output: Contribution to journal › Article (Academic Journal) › peer-review

6 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	1255-1264
Number of pages	10
Journal	Phase Transitions
Volume	87
Issue number	12
Early online date	26 Sept 2014
DOIs	https://doi.org/10.1080/01411594.2014.953504
Publication status	Published - Dec 2014

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@article{856efe4eb23b4ac99a2d78244462c2db,

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

abstract = "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) {\AA}3, 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.",

author = "Fei Qin and Xiang Wu and Shuangmeng Zhai and Shan Qin and Ke Yang and Dongliang Chen and Yanchun Li",

year = "2014",

month = dec,

doi = "10.1080/01411594.2014.953504",

language = "English",

volume = "87",

pages = "1255--1264",

journal = "Phase Transitions",

issn = "0141-1594",

publisher = "Taylor \& Francis Group",

number = "12",

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TY - JOUR

T1 - Pressure-induced phase transition of lead phosphate Pb3(PO4)2: X-ray diffraction and XANES

AU - Qin, Fei

AU - Wu, Xiang

AU - Zhai, Shuangmeng

AU - Qin, Shan

AU - Yang, Ke

AU - Chen, Dongliang

AU - Li, Yanchun

PY - 2014/12

Y1 - 2014/12

N2 - 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.

AB - 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.

U2 - 10.1080/01411594.2014.953504

DO - 10.1080/01411594.2014.953504

M3 - Article (Academic Journal)

SN - 0141-1594

VL - 87

SP - 1255

EP - 1264

JO - Phase Transitions

JF - Phase Transitions

IS - 12

ER -

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

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