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Nb28Ni33.5Sb12.5, a New Representative of the X-phase

✍ Scribed by Meitian Wang; Arthur Mar

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
644 KB
Volume
160
Category
Article
ISSN
0022-4596

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✦ Synopsis

The 5rst ternary compound in the Nb+Ni+Sb system, Nb 28 Ni 33.5 Sb 12.5 , has been synthesized and its structure has been determined by single-crystal X-ray di4raction methods. Nb 28 Ni 33.5(2) Sb 12.5(2) adopts the X-phase structure type (orthorhombic, space group Pnnm, Z ‫؍‬ 1, a ‫؍‬ 13.2334(5) A s , b ‫؍‬ 16.5065(7) A s , c ‫؍‬ 5.0337(2) A > ), which belongs to the set of tetrahedrally close-packed (TCP) structures adopted by many intermetallic compounds. Typical of such TCP structures, the atoms reside in sites of high coordination number, with Ni and Sb in CN12 and Nb in CN14, -15, and -16 sites. The relative importance of various metal+metal bonding interactions is discussed on the basis of extended HuK ckel band structure calculations. Nb 28 Ni 33.5 Sb 12.5 displays metallic behavior with a roomtemperature resistivity of 2.3 Ψ‹ 10 ؊4 cm.

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