First-principles studies of lattice dynamics and thermal properties of Mg2Si1-xSnx

Xiaohua Liu, Yi Wang, Jorge O. Sofo, Tiejun Zhu, Long Qing Chen, Xinbing Zhao

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9 Scopus citations

Abstract

We present the results of a mixed-space approach, based on first-principles calculations, to investigate phonon dispersions and thermal properties of Mg2Si and Mg2Sn, including the bulk modulus, Grüneisen parameter, heat capacity, and Debye temperature. It is shown that good agreements are obtained between the calculated results and available experimental data for both phonon dispersions and thermal properties. The phonon dispersions are accurately calculated compared with experimental data due to the high-quality description of LO-TO splitting and transverse acoustic branches along the Γ-K-X symmetry line. We also calculate the heat capacity C P and Debye temperature of Mg2Si1-xSn x alloys (x = 0.375, 0.5, 0.625, 0.875). The C P values at high temperature range from 0.5 to 0.7 J/g/K and ΘD values at room temperature from 332 to 384 K as the Sn content decreases from 0.875 to 0.375.

Original languageEnglish (US)
Pages (from-to)2578-2584
Number of pages7
JournalJournal of Materials Research
Volume30
Issue number17
DOIs
StatePublished - May 15 2015

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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