Issue 15, 2021

The distortion of two FePO4 polymorphs with high pressure

Abstract

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 ∼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 ∼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.

Graphical abstract: The distortion of two FePO4 polymorphs with high pressure

Supplementary files

Article information

Article type
Paper
Submitted
15 Mär 2021
Accepted
11 Jun 2021
First published
11 Jun 2021
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2021,2, 5096-5104

The distortion of two FePO4 polymorphs with high pressure

C. L. Bull, C. J. Ridley, N. P. Funnell, C. W. Wilson and S. G. MacLeod, Mater. Adv., 2021, 2, 5096 DOI: 10.1039/D1MA00227A

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