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Magnetic properties and site occupancy of iron in nontronite

P. R. Lear and J. W. Stucki
Magnetic properties and site occupancy of iron in nontronite
Clay Minerals (March 1990) 25 (1): 3-13


The magnetic susceptibilities of seven different nontronites in their natural oxidation states were measured between 5 and 100K. Results show that the magnetic exchange interaction in all samples was antiferromagnetic, though no clear minimum occurred at the Neel T. Magnetic dilution and tetrahedral Fe (super 3+) content could explain the anomalous antiferromagnetic behaviour in some, but not all, samples. In this model, > or equal to 13% of the octahedral Fe (super 3+) would occupy trans-dihydroxide sites, with the balance in cis sites. Magnetic frustration occurs because two Fe (super 3+) neighbours of a third Fe (super 3+) ion are also neighbours to each other, making the simultaneous satisfaction of all antiferromagnetic exchange interactions impossible.

ISSN: 0009-8558
Serial Title: Clay Minerals
Serial Volume: 25
Serial Issue: 1
Title: Magnetic properties and site occupancy of iron in nontronite
Affiliation: Univ. Ill., Urbana, IL, United States
Pages: 3-13
Published: 199003
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 25
Accession Number: 1990-034887
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1990
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