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The influence of crystallinity on the Mössbauer spectrum of lepidocrocite

Published online by Cambridge University Press:  05 July 2018

Enver Murad  and
Udo Schwertmann
Enver Murad
Affiliation:
Lehrstuhl für Bodenkunde, Technische Universität München, D-8050 Freising-Weihenstephan, Federal Republic of Germany
Udo Schwertmann
Affiliation:
Lehrstuhl für Bodenkunde, Technische Universität München, D-8050 Freising-Weihenstephan, Federal Republic of Germany
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Abstract

Particle morphology can result in very pronounced effects of crystallinity on the Mössbauer spectra of lepidocrocite. Such effects can noticeably increase the quadrupole splitting of poorly crystallized paramagnetic lepidocrocites, making it necessary to fit two doublets of different quadrupole splittings to Mössbauer spectra of such samples, and may lower the onset of magnetic ordering from the bulk Néel temperature of 77 ±1 K to about 50 K.

At 4.2 K, distributions of magnetic hyperfine fields with a limiting upper field of 460 kOe are observed. The contributions of lower fields to such distributions increase with decreasing crystallinity, producing asymmetrically broadened resonant lines.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 349 , December 1984 , pp. 507 - 511
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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