Probing nonequivalent sites in iron phosphide Fe 2 P and its mechanism of phase transition

Tingting Gu (), Xiang Wu (), Shan Qin, Catherine McCammon and Leonid Dubrovinsky

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 7, 1-6

Abstract: Comparative studies of two polymorphs ( \hbox{$P\overline{6}2m$} P 6 2 m and Pnma structures) of Fe 2 P up to 16.8 GPa and 1800 ± 200 K were performed using Mössbauer spectroscopy combined with diamond anvil cell and laser heating facilities. Mössbauer spectra were collected before and after its phase transition from \hbox{$P\overline{6}2m$} P 6 2 m to Pnma structures. Mössbauer hyperfine parameters in two non-equivalent sites Fe I and Fe II in Fe 2 P were evaluated and compared. An evident drop of quadrupole splitting for the 57 Fe in Fe II site was observed in its high temperature polymorph, indicating that a more sensitive pyramidal Fe II site to pressure change could serve as a trigger to this phase transition. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2013-40086-3

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