AlB10, a new phase, and a critique on the aluminum borides*
- 1 January 1959
- journal article
- research article
- Published by Walter de Gruyter GmbH in Zeitschrift für Kristallographie
- Vol. 111 (1-6) , 53-62
- https://doi.org/10.1524/zkri.1959.111.1-6.53
Abstract
As a result of a critical review of the four reported aluminum boride phases, it is shown that only three (AlB2, α AlB12, and β AlB12) are authenticated. The fourth, “monoclinic AlB12”, is identified with rhombohedral, elemental boron. A new, well-defined aluminum-boride phase, AlB10, is described. Crystals are black, highly lustrous, and pyramidal or tabular in habit. The unit cell is orthorhombic, pseudo-tetragonal, probably B 2/b 21/m 2/m, with a = 8.881 ± 0.001 Å, b = 9.100 ± 0.002 Å, c = 5.690 ± 0.001 Å, D = 2.537 ± 0.003 g/cm3, Z = 5.20. Methods of preparation, chemical analyses, powder-diffraction data, morphological data, and some physical porperties are described. AlB2, AlB10, α AlB12, and β AlB12 thus represent the present complement of established binary phases in the aluminum–boron system.Keywords
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