Phonon engineering using endohedral nano space in clathrates

Jingtao Xu, Jun Tang, Kazumi Sato, Katsumi Tanigaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Rattling motions in Type I clathrates (Sr8Ga16Ge 30 and Ba8Ga16Ge30) are studied by heat capacity measurements. Using several models, the lattice contributions to the heat capacity are shown to be different among the alkaline-earth elements. The contributions of the anharmonic motions of the endohedral atoms to the heat capacity are found to be larger in Sr8Ga16Ge30 than those in Ba8Ga16Ge30. The experimental data for Ba8Ga16Ge30 are fitted to standard Debye and Einstein models. Extracted charge carrier mean free paths indicate that conduction electrons are not strongly scattered by endohedral atom vibrations while heat transfer in Sr8Ga16Ge30 is greatly reduced.

Original languageEnglish
Title of host publicationPhonon Engineering for Enhanced Materials Solutions - Theory and Applications
Pages74-78
Number of pages5
Publication statusPublished - 2010 Dec 1
Event2009 MRS Fall Meeting - Boston, MA, United States
Duration: 2009 Nov 302009 Dec 4

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1221
ISSN (Print)0272-9172

Other

Other2009 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA
Period09/11/3009/12/4

ASJC Scopus subject areas

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

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