Lanthanum and Praseodymium Bromide Pnictides. A Convergence of Interstitial Chemistry in Cluster Halides and Intermetallic Pnictides
✍ Scribed by Elizabeth A. Jensen; Laura M. Hoistad; John D. Corbett
- Book ID
- 102607992
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 281 KB
- Volume
- 144
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Reactions of metal R, RBr 3 (R ؍ La, Pr), and pnictogen Pn (P, As, Sb, Bi) at 900-1000°C provide a new series of condensed cluster products, either cubic R 3 Br 3 Pn or hexagonal R 5 Pn 3 Br, but not both for the same Pn. Syntheses and lattice dimensions for all eight examples are reported. Cubic R 3 Br 3 Pn results with interstitial P or As (Ca 3 I 3 P type, I4 1 32 (No. 214), Z ؍ 8), whereas hexagonal P 5 Pn 3 Br is formed for Pn ؍ Sb, Bi with interstitial Br (stuffed Mn 5 Si 3 type), a new range of composition for these compounds. The latter structure for La 5 Sb 3 Br was refined by single-crystal X-ray diffraction data (P6 3 /mcm (No. 193), Z ؍ 2, a ؍ 9.602(2) A s , c ؍ 6.7331(3) A s , R(F)/R w ؍ 1.7/2.0%). Features that determine the formation of a particular set of compounds in each structure type are discussed.