Edinburgh Research Explorer

Total energy calculation for high pressure selenium: the origin of incommensurate modulations in SeIV and the instability of proposed SeII

Research output: Contribution to journalArticle

Related Edinburgh Organisations

Original languageEnglish
Pages (from-to)1851-1859
Number of pages9
JournalJournal of Physics: Condensed Matter
Volume17
Issue number12
DOIs
Publication statusPublished - 30 Mar 2005

Abstract

We present calculations of the high pressure crystal structures in selenium, including rational approximants to the recently reported incommensurate phases. We show how the incommensurate phases can be intuitively explained in terms of imaginary phonon frequencies arising from Kohn anomalies in the putative undistorted phase. We also find inconsistencies between the calculated and experimental Se II phase-the calculations show it to be a metastable metal while the experiment finds a stable semiconductor. We propose that the experimentally reported structure is probably in error.

    Research areas

  • STRUCTURAL PHASE-TRANSITION, ELECTRONIC-STRUCTURE, CRYSTAL-STRUCTURES, BARIUM-IV, TE, APPROXIMATION, STABILITY, TELLURIUM

ID: 1278574