Yb5In2Sb6: A new rare earth Zintl phase with a narrow band gap

Sung Jin Kim, John R. Ireland, Carl R. Kannewurf, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The new Zintl phase Yb5In2Sb6 was obtained from a direct element combination reaction in a sealed graphite tube at 700°C and its structure was determined. It crystallizes in the orthorhombic space group Pbam (No. 55), in the Ba5Al2Bi6 structure type, with a unit cell of a=7.3992(5) Å, b=23.001(6) Å, c=4.5139(4) Å, and Z=2. Yb5In2Sb6 has a one-dimensional structure with infinite anionic double chains (In2Sb6)10- separated by Yb2+ ions. Each single chain is made of corner-sharing InSb4 tetrahedra. Two such chains are bridged by Sb2 groups to form double chains 1/∞ [In2Sb6/10-]. The compound satisfies the classical Zintl concept and is a narrow gap semiconductor. Band structure calculations suggest an direct band gap. Polycrystalline ingots of Yb5In2Sb6 showed electrical conductivity of 100 S/cm and a Seebeck coefficient of ~ +30 μ V/K at room temperature. The thermal conductivity of Yb5In2Sb6 is about 1.7 W/mK in the temperature range of 150-300 K. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)55-61
Number of pages7
JournalJournal of Solid State Chemistry
Volume155
Issue number1
DOIs
Publication statusPublished - 2000

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Rare earths
narrowband
Energy gap
rare earth elements
Seebeck coefficient
Graphite
Ingots
Band structure
Thermal conductivity
Ions
Semiconductor materials
Temperature
ingots
Seebeck effect
tetrahedrons
thermal conductivity
graphite
tubes
electrical resistivity
room temperature

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Yb5In2Sb6 : A new rare earth Zintl phase with a narrow band gap. / Kim, Sung Jin; Ireland, John R.; Kannewurf, Carl R.; Kanatzidis, Mercouri G.

In: Journal of Solid State Chemistry, Vol. 155, No. 1, 2000, p. 55-61.

Research output: Contribution to journalArticle

Kim, Sung Jin ; Ireland, John R. ; Kannewurf, Carl R. ; Kanatzidis, Mercouri G. / Yb5In2Sb6 : A new rare earth Zintl phase with a narrow band gap. In: Journal of Solid State Chemistry. 2000 ; Vol. 155, No. 1. pp. 55-61.
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