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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Tiekink, E. R. T.

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Volume 145, Issue 1-2

Issues

Twinning and disorder in zinc perchlorate hexahydrate crystals

Minakshi Ghosh / Siddhartha Ray
Published Online: 2010-07-28 | DOI: https://doi.org/10.1524/zkri.1977.145.1-2.146

Abstract

The crystal structure of zinc Perchlorate hexahydrate resembles that of lithium Perchlorate trihydrate (space group: P63mc) as far as the perchlorate-water arrangement is concerned. The distribution of zinc atoms among twice their number of available sites gives rise to orthorhombic symmetry (space group: Pmn21), and crystals of this salt grow as three-component twins, in which the perchlorate-water arrangement is continuous throughout a crystal, discontinuity at the twin boundaries being only in the distribution of zinc atoms. Moreover, in the odd-layer Weissenberg photographs from rotation about the c axis, certain spots containing contributions from zinc atoms only streak out to form a hexagonal network. This observation has been explained in terms of mistakes in repetition along the b axis of the orthorhombic cell of each of the three twin components; the probability of such mistake has been estimated quantitatively from the intensity distribution of a suitable diffuse streak.

About the article

Published Online: 2010-07-28

Published in Print: 1977


Citation Information: Zeitschrift für Kristallographie, Volume 145, Issue 1-2, Pages 146–154, ISSN (Online) 0044-2968, ISSN (Print) 1433-7266, DOI: https://doi.org/10.1524/zkri.1977.145.1-2.146.

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