Effect of Al substitution on the thermoelectric properties of the type VIII clathrate Ba 8Ga 16Sn 30

S. K. Deng, Y. Saiga, Koichiro Suekuni, T. Takabatake

Research output: Contribution to journalArticle

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Abstract

Single-crystal samples of the type VIII clathrate Ba 8Ga 16-x Al x Sn 30 (0 ≤ x ≤ 12) were prepared by the Sn-flux method, and the structural and electrical properties were studied from 300 K to 600 K. The lattice parameter increases linearly as x is increased from 0 to 10.5, which is the solubility limit of Al. For all samples, the electrical conductivity σ decreases monotonically as the temperature is increased. σ(T = 300 K) increases from 1.88 × 10 4 S/m for x = 0 to 3.03 × 10 4 S/m for x = 2, and then gradually decreases to 2.4 × 10 4 S/m with further increase of x to 8. The increase of σ for Al-substituted samples is attributed to enhancement of carrier mobility. The Seebeck coefficients of samples with 0 ≤ x ≤ 8 are negative with large values, and the absolute values increase from 240 μV/K to 320 μV/K as the temperature increases from 300 K to 600 K. At 300 K, the effective mass m*/m 0 is in the range from 0.53 to 0.67, and the samples with x = 6 and x = 8 have a rather low thermal conductivity of 0.72 W/mK and 0.78 W/mK, respectively. ZT reaches 1.2 at 500 K for x = 6.

Original languageEnglish
Pages (from-to)1124-1128
Number of pages5
JournalJournal of Electronic Materials
Volume40
Issue number5
DOIs
Publication statusPublished - May 1 2011
Externally publishedYes

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clathrates
Substitution reactions
substitutes
Seebeck coefficient
Carrier mobility
Lattice constants
Structural properties
Thermal conductivity
Electric properties
Solubility
Single crystals
Fluxes
Temperature
Seebeck effect
carrier mobility
lattice parameters
thermal conductivity
solubility
electrical properties
electrical resistivity

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Effect of Al substitution on the thermoelectric properties of the type VIII clathrate Ba 8Ga 16Sn 30 . / Deng, S. K.; Saiga, Y.; Suekuni, Koichiro; Takabatake, T.

In: Journal of Electronic Materials, Vol. 40, No. 5, 01.05.2011, p. 1124-1128.

Research output: Contribution to journalArticle

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