In situ formation of FePO4-II: a neutron diffraction study

C. W. Wilson, C. J. Ridley, S. G. MacLeod, C. L. Bull

Research output: Contribution to journalArticlepeer-review

Abstract

The structural transformation of FePO (Formula presented.) from the trigonal berlinite phase to the orthorhombic CrVO (Formula presented.) phase has been studied using neutron diffraction at high pressure and high-temperature. The berlinite structure was compressed to a pressure of 5.2(2) GPa and amorphisation observed. Upon annealing at temperatures above 798(28) K the high pressure FePO (Formula presented.) structure was observed to form. This lowers the formation temperature required to promote this phase over the amorphous phase by ∼100 K compared to previous reports. No other structured phases were observed during the formation process which implies that the CrVO (Formula presented.) structure is the most stable form at high pressures and is kinetically inhibited from forming at low temperatures.

Original languageEnglish
Pages (from-to)14-26
Number of pages13
JournalHigh Pressure Research
Volume41
Issue number1
DOIs
StatePublished - 2021
Externally publishedYes

Keywords

  • high pressure
  • high-temperature
  • Iron phosphate
  • neutron diffraction

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