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; S. A.T. Redfern

doi:10.1180/0026461046860227

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, S. A.T. Redfern^*

^*Corresponding author for this work

University of Cambridge

Research output: Contribution to journal › Article › peer-review

Abstract

The magnetic susceptibility of ordered and partially disordered manganogrunerites (composition Ca_0.1Mn_1.9Mg _1.25Fe_3.5 ₆²⁺Fe _0.38³⁺Si_7.81O₂₂(OH) ₂ and Ca_0.24Mn_1.57 Mg _2.27Fe_2.76²⁺Fe_0.32 ³⁺Si_7.84O₂₂(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 χ_p and T _N 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.

Original language	English
Pages (from-to)	853-858
Number of pages	6
Journal	Mineralogical Magazine
Volume	68
Issue number	6
DOIs	https://doi.org/10.1180/0026461046860227
Publication status	Published - Dec 2004
Externally published	Yes

ASJC Scopus Subject Areas

Geochemistry and Petrology

Keywords

Amphibole
Antiferromagnet
Dilution
Order-disorder

Access to Document

10.1180/0026461046860227

Cite this

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

abstract = "The magnetic susceptibility of ordered and partially disordered manganogrunerites (composition Ca0.1Mn1.9Mg 1.25Fe3.5 62+Fe 0.383+Si7.81O22(OH) 2 and Ca0.24Mn1.57 Mg 2.27Fe2.762+Fe0.32 3+Si7.84O22(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 χp and T N 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, Antiferromagnet, Dilution, Order-disorder",

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T1 - Influence of metal cation order on magnetic order in manganogrunerite, (Fe,Mg,Mn)7Si8O22(OH)2, a quasi-one-dimensional chain antiferromagnet

AU - Reece, J. J.

AU - Redfern, S. A.T.

PY - 2004/12

Y1 - 2004/12

N2 - The magnetic susceptibility of ordered and partially disordered manganogrunerites (composition Ca0.1Mn1.9Mg 1.25Fe3.5 62+Fe 0.383+Si7.81O22(OH) 2 and Ca0.24Mn1.57 Mg 2.27Fe2.762+Fe0.32 3+Si7.84O22(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 χp and T N 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.

AB - The magnetic susceptibility of ordered and partially disordered manganogrunerites (composition Ca0.1Mn1.9Mg 1.25Fe3.5 62+Fe 0.383+Si7.81O22(OH) 2 and Ca0.24Mn1.57 Mg 2.27Fe2.762+Fe0.32 3+Si7.84O22(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 χp and T N 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.

KW - Amphibole

KW - Antiferromagnet

KW - Dilution

KW - Order-disorder

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