Phase relations in the Fe-P system at high pressures and temperatures from ab initio computations

Nursultan E. Sagatov, Pavel N. Gavryushkin, Maksim V. Banayev, Talgat M. Inerbaev, Konstantin D. Litasov

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Based on the first-principles calculations within the density functional theory and crystal structure prediction algorithms iron phosphide phases stable under pressure of the Earth’s core and temperatures up to 4000 K were determined. A new low-temperature modification FeP-P21/c stable above ∼75 GPa was predicted. Fe2P with the allabogdanite structure has been established to be stable in the low-temperature region at ambient conditions. At 750 K it transforms into the barringerite structure. The transition from Fe3P with schreibersite structure to Fe3P-Cmcm was observed at 27 GPa, and the phase transition boundary is nearly isobaric. Fe2P and FeP are thermodynamically stable at the Earth’s inner core pressures and 0 K according to the obtained results, whereas Fe3P stabilizes with respect to decomposition to Fe + Fe2P at high temperatures above ∼3200 K.

Original languageEnglish
Pages (from-to)235-244
Number of pages10
JournalHigh Pressure Research
Volume40
Issue number2
DOIs
Publication statusPublished - 2 Apr 2020

Keywords

  • allabogdanite
  • barringerite
  • crystal structure prediction
  • density functional theory
  • Phosphides
  • TRANSITION
  • CRYSTAL-STRUCTURE PREDICTION
  • EARTHS CORE
  • DIAGRAM

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