| Autor: |
M.A. Mitchell, F. E. Wang, R.A. Sutula, J. R. Holden, Lawrence H. Bennett |
| Rok vydání: |
1978 |
| Předmět: |
|
| Zdroj: |
Journal of the Less Common Metals. 61:237-251 |
| ISSN: |
0022-5088 |
| DOI: |
10.1016/0022-5088(78)90219-9 |
| Popis: |
On the basis of X-ray and neutron powder diffraction data and substantiated by nuclear magnetic resonance measurements a crystal structure for Li5B4 is proposed. The proposed structure is rhombohedral (R3m) with a = 4.93 A and a = 90° but it is disordered in such a way that its long range symmetry is body-centered cubic ( I 4 3m ) with a = 4.93 A . Within the short range order the boron atoms (in units of 4) form planar clusters with a central atom surrounded by three others. This boron configuration has no counterpart in either metal borides or boron hydrides. The lithium atoms cluster in trigonal bipyramids (two tetrahedra sharing a common face) with five atoms at the vertices. This configuration is similar to that found in the low temperature hexagonal structure of lithium. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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