TY - JOUR
T1 - Noncentrosymmetric cubic thio- and selenogermanates
T2 - A0.5M 1.75GeQ4 (A = Ag , Cu, Na; M = Pb, Eu; Q = S, Se)
AU - Iyer, Ratnasabapathy G.
AU - Aitken, Jennifer A.
AU - Kanatzidis, Mercouri G.
PY - 2004/5/1
Y1 - 2004/5/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.solidstatesciences.2004.03.001
DO - 10.1016/j.solidstatesciences.2004.03.001
M3 - Article
AN - SCOPUS:1942425607
VL - 6
SP - 451
EP - 459
JO - Solid State Sciences
JF - Solid State Sciences
SN - 1293-2558
IS - 5
ER -