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Magnetic behaviour of trioctahedral mica-2M1 occurring in a magnetic anomaly zone

Published online by Cambridge University Press:  05 July 2018

S. Pini ,
M. Affronte  and
M. F. Brigatti
S. Pini
Affiliation:
Dipartimento di Scienze Della Terra, Università di Modena e Reggio Emilia, Via S. Eufemia, 19, I-41100 Modena, Italy
M. Affronte
Affiliation:
Dipartimento di Fisica, Università di Modena e Reggio Emilia, Via G. Campi 213/a, I-41100 Modena, Italy
M. F. Brigatti*
Affiliation:
Dipartimento di Scienze Della Terra, Università di Modena e Reggio Emilia, Via S. Eufemia, 19, I-41100 Modena, Italy
*
*E-mail: [email protected]
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Abstract

This work relates the crystal chemistry and the magnetic behaviour of a trioctahedral mica (chemical formula: (K0.90Na0.01Ca0.01Ba0.01 ☐0.07)(Al0.05Fe2+1.10Mg1.38Ti0.32Mn0.01☐0.04)(Al1.12Si2.88)O10 (F0.27OH1.27O0.46); unit cell parameters: a = 5.345(2) Å, b = 9.261(4) Å, c = 20.189(8) Å; β = 95.075(8)°) from Minto Block (Ungava peninsula, northern Quebec, Canada), a region characterized by high magnetic anomalies. Crystallographic and X-ray absorption spectroscopy data suggest a prevalent divalent oxidation state for Fe and a disordered Fe 2+ distribution in the two octahedral sites Ml and M2. The real part of magnetic susceptibility shows two peaks at ∼5.2 K and 120 K. However, as demonstrated by AC magnetic susceptibility measurements, the origin of the two effects is different: the peak position of the first one (i.e. the effect revealed at 5.2 K) is frequency-dependent, thus suggesting a spin-glass like behaviour. The effect at 120 K can instead be attributed to the occurrence of diluted phases in mica matrix, such as Fe oxides.

Keywords

magnetic behaviourcrystalchemistrytrioctahedralmicaUngavaCanada
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 5 , October 2008 , pp. 1035 - 1042
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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Crystallographic coordinates

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Structure factors

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