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Re: Crystal Structures of Pyroaurite and Sjögrenite

Published online by Cambridge University Press:  06 March 2019

A. Olowe
A. Olowe*
Affiliation:
College of Engineering and Applied Science Western Michigan University, Kalamazoo, MI 49008
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Abstract

Pyroaurite and sjogrenite belong to the group of sandwiched lamellar metal hydroxides which have a fixed metallic ions MII:MIII ratio for a particular class. Their crystal structure consists of positively charged metal hydroxide blocks intercalated with negatively charged interlayers. The atomic positions for the interlayer are definite for a particular class. The exact chemical formula of the pyroaurite class is determined from crystal structure analysis to be MII6MIII2(OH)16-CO3-4.5H2O; it crystallizes in the space group Rm with a = 12.4376 Å and c = 23.4126 Å. Sjogrenite, MII6 MIII2(OH)16-CO3-4H2O crystallizes in the space group P63/mcm. The crystallogiraphy and structural relationship between these classes are discussed. Previous discussion on these compounds did not give any conclusion on the exact chemical formula and the atomic positions.

Type
X. Structural and Other Applications of Powder Diffraction
Information
Advances in X-Ray Analysis , Volume 38: Forty-third Annual Conference on Applications of X-ray Analysis , 1994 , pp. 749 - 755
Copyright
Copyright © International Centre for Diffraction Data 1994

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