Thermoelectric performance of Al-Pd-Mn quasicrystals: Comparison with (1/1,2/1-)AlPdMnSi approximants and improvement by Ga substitution for Al

Yoshiki Takagiwa, Takahiko Kamimura, Sizuka Hosoi, Junpei Tamura Okada, Kaoru Kimura

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report the thermoelectric properties of polygrain icosahedral Al-Pd-Mn quasicrystal and compare with those of (1/1, 2/1-)AlPdMnSi approximant crystals. To improve the dimensionless figure of merit (ZT), we substitute Ga for Al atoms in Al-Pd-Mn quasicrystal in accordance with the guiding principle of "weakly bonded rigid heavy clusters" (WBRHCs). Although the thermoelectric properties do not obey the WBRHCs principle, the maximum ZT increased by a factor of 1.4 from 0.18 for Al71Pd20Mn 9 to 0.26 for Al68Ga3Pd20Mn 9 quasicrystal.

Original languageEnglish
Pages (from-to)21-25
Number of pages5
JournalZeitschrift fur Kristallographie
Volume224
Issue number1-2
DOIs
Publication statusPublished - 2009 Apr 15
Externally publishedYes

Keywords

  • Al-Pd-Mn - (Si)
  • Approximant crystals
  • Quasicrystals
  • Thermoelectric properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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