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New Ternary Compounds MxTa11−xGe8 (M=Ti, Zr, Hf): Structure and Stabilization

✍ Scribed by Klaus W. Richter; Hans Flandorfer; Hugo F. Franzen

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
315 KB
Volume
167
Category
Article
ISSN
0022-4596

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✦ Synopsis

The title compounds M x Ta 11Àx Ge 8 (M=Ti, Zr, Hf) were prepared from the pure elements by arc-melting and subsequent induction heating at temperatures between 12001C and 14001C. X-ray powder diffraction studies of the samples were performed using the Guinier technique and the respective powder patterns were refined with a structure model based on the orthorhombic Cr 11 Ge 8 -structure type (oP76, Pnma). The homogeneity ranges of the compounds were determined to be 0:9oxo1:3 (M=Ti), 0:7oxo1:3 (M=Zr) and 0:7oxo2:4 (M=Hf) by means of electron probe microanalysis. Chemical bonding, electronic structure and site preferences are discussed based on extended H. uckel calculations performed on hypothetical binary Ta 11 Ge 8 .

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