Pt29Zn49, a complex defective AlB2-type derivative structure

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作者：
Thimmaiah, Srinivasa [1 ]
Harbrecht, Bernd [1 ]
机构：
[1] Fachbereich Chemie und Wissenschaftliches Zentrum für Materialwissenschaften, Philipps-Universität, D-35032 Marburg, Germany
来源：
Journal of Alloys and Compounds | 2006年 / 417卷 / 1-2期
关键词：
The crystal structure of the title compound has been determined by X-ray diffraction means. Pt29Zn49 forms a complex superstructure of a defective AlB2-type derivative of the order 58: a = 279.0(1) pm; b; 11895.2(4); pm; c; 698.0(1); space group Amm2; Z = 2. Ordering of vacancies is accompanied by a particular distortion of defective graphite-like 63 nets consisting exclusively of Zn atoms. The ordering induces a modulation of the structure along ah of an AlB2-type structure with a periodicity of nearly 12 nm. A mechanistic model is proposed elucidating how Pt29Zn49 evolves from the eutectoid decomposition of the inter-mediate high temperature precursor Pt7Zn12. © 2005 Elsevier B.V. All rights reserved;
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页码：45 / 49
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