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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
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- Journal:
- Mineralogical Magazine / Volume 68 / Issue 6 / December 2004
- Published online by Cambridge University Press:
- 05 July 2018, pp. 853-858
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- Article
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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.
and 
) has been measured between room temperature and 5 K. The influence of disordering of metal cations over the 