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Mineralogical Magazine; December 2004; v. 68; no. 6; p. 853-858; DOI: 10.1180/0026461046860227
© 2004 Mineralogical Society of Great Britain and Ireland
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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

J. J. Reece and S. A. T. Redfern*

Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK

* E-mail: satr{at}cam.ac.uk

The magnetic susceptibility of ordered and partially disordered manganogrunerites (composition Ca0.1Mn1.9Mg1.25Fe2+3.56Fe3+0.38Si7.81O22(OH)2 and Ca0.24Mn1.57Mg2.27Fe2+2.76Fe3+0.32Si7.84O22(OH)2) 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 {theta}p 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: amphibole, order-disorder, antiferromagnet, dilution






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