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Influence of metal cation order on magnetic order in manganogrunerite, (Fe,Mg,Mn)7Si8O22(OH)2, a quasi-one-dimensional chain antiferromagnet

Published online by Cambridge University Press:  05 July 2018

J. J. Reece  and
S. A. T. Redfern
J. J. Reece
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
S. A. T. Redfern*
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
*
*E-mail: [email protected]
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Abstract

The magnetic susceptibility of ordered and partially disordered manganogrunerites (composition and ) has been measured between room temperature and 5 K. The influence of disordering of metal cations over the M(1,2,3) sites of the octahedral ribbon in these amphiboles is to dilute Fe2+ within the ribbon. We observe a reduction in both θp and TN as a function of both increased Mg/(Mg+Fe) and metal cation disorder, linked to a reduction in the strength of magnetic coupling between and within the one-dimensional chains of the structure.

Keywords

amphiboleorder-disorderantiferromagnetdilution
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 6 , December 2004 , pp. 853 - 858
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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