The distortion of two FePO4 polymorphs with high pressure

被引：4

作者：

Bull, Craig L. ^{[1
,2
]}

Ridley, Christopher J. ^{[1
]}

Funnell, Nicholas P. ^{[1
]}

Wilson, Craig W. ^{[3
]}

MacLeod, Simon G. ^{[3
]}

机构：

[1] Rutherford Appleton Lab, ISIS Neutron & Muon Facil, Chilton, England

[2] Univ Edinburgh, Sch Chem, David Brewster Rd, Edinburgh EH9 3FJ, Midlothian, Scotland

[3] AWE, Reading RG7 4PR, Berks, England

来源：

MATERIALS ADVANCES | 2021年 / 2卷 / 15期

关键词：

NEUTRON-DIFFRACTION; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; PHASE; PHOSPHATE; TEMPERATURE; TRANSFORMATIONS; TRANSITION; STABILITY; BEHAVIOR;

D O I：

10.1039/d1ma00227a

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Both the trigonal (Berlinite-type, phase-I), and orthorhombic (CrVO4-type, phase-II) forms of FePO4 have been studied at high-pressure using neutron powder diffraction. Phase-II was prepared by a high-pressure, high-temperature synthetic route, and recovered to ambient conditions. We report the first experimental high-pressure structural study of this phase up to similar to 8.4 GPa at room temperature. It is shown that with increasing pressure, the FeO6 octahedra become more regular and decrease in volume, while the PO4 tetrahedra become less regular and increase in volume. For phase-I, similar changes in volume are determined, though without changes in distortion. At similar to 2 GPa a signature of amorphisation has been observed for phase-I with the appearance of broad phase-II reflections. To support the results of the high-pressure study, Raman spectroscopic and SQUID magnetometry studies have been performed.

引用

页码：5096 / 5104

页数：9

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