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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) July 28, 2010

γ AlB12, a new structure, and its relation to α AlB12 as shown by twinned space groups

Abstract

A new AlB12 structure (γ) is described and its relation to α AlB12 defined. The γ structure is polytypically related to α AlB12 in having a 2-layer (rather than 3-layer) stacking along a normal to (101)α (≈ [201]α). The αγ relationship involves cell twinning on every (101)α layer, using a normal to (101)α as the rotary twin operator, the latter being derived from space group considerations. Implications of the relationship are discussed, γ AlB12 crystals are hematitelike, lath-shaped, often syntaxically intergrown with α AlB12. The unit cell is orthorhombic with a = 16.56 Å, b = 17.53 Å, c = 10.16 Å, Z = 29, space group P212121. Morphological data are presented.

Published Online: 2010-07-28
Published in Print: 1961-11
Downloaded on 19.3.2024 from https://www.degruyter.com/document/doi/10.1524/zkri.1961.116.1-2.134/html
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