Magnetic properties of the natural pyrope-almandine garnets

Four natural samples of the pyrope-almandine solid-solution series have been studies by Mössbauer spectroscopy and magnetization measurements have been made to determine their magnetic properties. The samples exhibit a normal para- to antiferromagnetic transition at low temperatures. The paramagneti...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1989-04, Vol.79 (1), p.1-7
Main Authors: de Oliveira, J.C.P., da Costa, M.I., Schreiner, W.H., Vasquez, A.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geophysics: general, magnetic, electric and thermic methods and properties
Internal geophysics
Mineralogy
Mineralogy: general, methodology, regional studies
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Summary:Four natural samples of the pyrope-almandine solid-solution series have been studies by Mössbauer spectroscopy and magnetization measurements have been made to determine their magnetic properties. The samples exhibit a normal para- to antiferromagnetic transition at low temperatures. The paramagnetic susceptibilities of the pyrope-almandine samples follow a Curie-Weiss law at temperatures above 60 K. The Néel temperature (TN), and the paramagnetic Curie temperature (θc) change with chemical composition. Mössbauer spectra of the almandine taken in the magnetically ordered phase can be fitted with two Fe2+ eight-line magnetic hyperfine patterns of equal intensities. The Mössbauer spectra of the other samples of the series at low temperatures are interpreted as due to different magnetic environmental configurations of Fe2+.
ISSN:0304-8853
DOI:10.1016/0304-8853(89)90285-0