Transition Metal-Substituted Lithium Pnictogenide phases. Synthesis and Crystal Structure Determinations of Novel Phases in the Li–M–X Systems (M=V, Nb, Ta; X=P, As)
✍ Scribed by Laure Monconduit; Monique Tillard-Charbonnel; Claude Belin
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 257 KB
- Volume
- 156
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Li+M+X systems have been investigated and crystal structures of several phases determined. Li7NbP4 crystallizes in the anti-6uorite-type structure (cubic, Fm3 m, a ؍ 5.996(1) A s , Z ؍ 1, R(F) ؍ 3.02%). LiNbAs2 and Li4.54V1.22As4 display the blendetype structure, cubic F4 3m space group (LiNbAs2:a ؍ 6.309(1) A s , Z ؍ 2, R(F) ؍ 2.12%; Li4.54V1.22As4:a ؍ 6.167(1) A s , Z ؍ 1, R(F) ؍ 1.49%). In all compounds, the transition metal statistically occupies some of the tetrahedral sites with lithium. For Li4.54V1.22As4, one of the octahedral sites of the fcc lattice is partially 5lled with lithium. This feature is also observed for the homologue compounds Lix(Li3.20Nb0.80)As4 and Lix(Li3.64Ta0.36)As4, 0< x44 (F4 3m, Z ؍ 1, a ؍ 6.190(3) and 6.184(3) A s , R(F) ؍ 1.76 and 3.42%, respectively).
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