New Ternary Zirconium Antimonides, ZrSi0.7Sb1.3, ZrGeSb, and ZrSn0.4Sb1.6: A Family Containing ZrSiS-Type andβ-ZrSb2-Type Compounds
✍ Scribed by Robert Lam; Arthur Mar
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 378 KB
- Volume
- 134
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The ternary antimonides ZrSi 0.7 Sb 1.3 and ZrGeSb have been synthesized through reaction of the elements at 1000 and 950°C, respectively, and their structures have been determined by single-crystal X-ray diffraction methods. They crystallize in the tetragonal space group D 7 4h -P4/nmm with Z ؍ 2 and cell dimensions of a ؍ 3.8091(2) A > and c ؍ 8.630(1) A > (ZrSi 0.7 Sb 1.3 ) and a ؍ 3.8451(7) A > and c ؍ 8.634(2) A > (ZrGeSb) at T °05؊؍C. They represent new members, having one of the lowest total valence electron counts, of the large class of compounds MAB (M ؍ transition metal; A, B ؍ main-group elements) that adopt the ZrSiS-type structure containing stacked square nets. The ternary antimonide ZrSn 0.4 Sb 1.6 has also been synthesized at 1000°C but it does not adopt the ZrSiS-type structure. Instead, it crystallizes in the orthorhombic space group D 16 2h -Pnma with a ؍ 7.3187(6) A > , b ؍ 3.9618(4) A > , c ؍ 9.7076(7) A > , and Z ؍ 4 (T °05؊؍C), adopting a structure that is a disordered variant of the known binary compound -ZrSb 2 . Reasons for the adoption of these two structure types are discussed.