Reduction of lattice thermal conductivity from planar faults in the layered Zintl compound SrZnSb2

Prytz, E. Flage-Larsen, E. S. Toberer, G. J. Snyder, J. Taftø

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The layered Zintl compound SrZnSb2 is investigated using transmission electron microscopy (TEM) to understand the low lattice thermal conductivity. The material displays out-of-phase boundaries with a spacing from 100 down to 2 nm. Density functional theory calculations confirm that the TEM-derived defect structure is energetically reasonable. The impact of these defects on phonon scattering is analyzed within the Debye-Callaway model, which reveals a significant reduction in the acoustic phonon mean free path. This enhancement in phonon scattering leads to an ∼30 reduction in lattice thermal conductivity at 300 K.

Original languageEnglish (US)
Article number043509
JournalJournal of Applied Physics
Volume109
Issue number4
DOIs
StatePublished - Feb 15 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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