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Preparation and Crystal Structure of the Titanium and Hafnium Bismuthides Ti8Bi9and Hf8Bi9

✍ Scribed by Carolin G. Richter; Wolfgang Jeitschko

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 272 KB
Volume: 134
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1997.7525

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✦ Synopsis

The titanium bismuthide Ti 8 Bi 9 has been prepared by reaction of the elemental components in evacuated, sealed silica tubes and also by arc-melting. Its crystal structure is of a new type, which was determined from single-crystal X-ray data: P4/nmm, a ‫؍‬ 1027.7(1) pm, c ‫؍‬ 737.5(1) pm, Z ‫؍‬ 2, R : 0.027 for 553 structure factors and 32 variable parameters. The titanium atoms occupy four different sites: two with octahedral and two with square-antiprismatic bismuth coordination. The bismuth atoms are located at three different sites with four, five, and seven titanium neighbors. An analysis of the Ti-Bi bonding distances (covering the range between 282 and 314 pm) leads to the conclusion that there are Ti-Ti bonding interactions (at distances between 293 and 307 pm). In addition, some weakly bonding Bi-Bi interactions (334-353 pm) are assumed. The compound Hf 8 Bi 9 has the same structure: a ‫؍‬ 1071.8(1) pm,

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