Noncentrosymmetric cubic thio- and selenogermanates: A0.5M 1.75GeQ4 (A = Ag , Cu, Na; M = Pb, Eu; Q = S, Se)

Ratnasabapathy G. Iyer, Jennifer A. Aitken, Mercouri G. Kanatzidis

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Abstract

Five new isostructural cubic thiogermanates with the formula A 0.5M1.75GeQ4 (A=Ag, Cu, Na; M=Pb, Eu; Q=S, Se) have been prepared by direct combination of stoichiometric amounts of the elements. The compounds crystallize in the noncentrosymmetric space group I-43d with Z=16 and a=14.0291(5) Å for Ag0.5Pb1.75GeS 4, a=14.5949(19) Å for Ag0.5Pb 1.75GeSe4, a=13.9491(14) Å for Ag 0.5Eu1.75GeS4, a = 13.8145(9) Å for Cu0.5Pb1.75GeS4 and a = 14.662(4) Å for Na0.5Pb1.75GeSe4. The adopted structure is similar to that of Ba3CdSn2S8, and features tetrahedral [GeQ4]4- building blocks. These compounds are semiconductors with energy gaps (Eg) ranging from 1.48 to 1.83 eV.

Original languageEnglish
Pages (from-to)451-459
Number of pages9
JournalSolid State Sciences
Volume6
Issue number5
DOIs
Publication statusPublished - May 2004

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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Noncentrosymmetric cubic thio- and selenogermanates : A0.5M 1.75GeQ4 (A = Ag , Cu, Na; M = Pb, Eu; Q = S, Se). / Iyer, Ratnasabapathy G.; Aitken, Jennifer A.; Kanatzidis, Mercouri G.

In: Solid State Sciences, Vol. 6, No. 5, 05.2004, p. 451-459.

Research output: Contribution to journalArticle

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abstract = "Five new isostructural cubic thiogermanates with the formula A 0.5M1.75GeQ4 (A=Ag, Cu, Na; M=Pb, Eu; Q=S, Se) have been prepared by direct combination of stoichiometric amounts of the elements. The compounds crystallize in the noncentrosymmetric space group I-43d with Z=16 and a=14.0291(5) {\AA} for Ag0.5Pb1.75GeS 4, a=14.5949(19) {\AA} for Ag0.5Pb 1.75GeSe4, a=13.9491(14) {\AA} for Ag 0.5Eu1.75GeS4, a = 13.8145(9) {\AA} for Cu0.5Pb1.75GeS4 and a = 14.662(4) {\AA} for Na0.5Pb1.75GeSe4. The adopted structure is similar to that of Ba3CdSn2S8, and features tetrahedral [GeQ4]4- building blocks. These compounds are semiconductors with energy gaps (Eg) ranging from 1.48 to 1.83 eV.",
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