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Infrared spectroscopic study of OH defects in monazite

Takeyasu Abe, Takahiro Kuribayashi and Michihiko Nakamura
Infrared spectroscopic study of OH defects in monazite
European Journal of Mineralogy (June 2017) 29 (6): 949-957

Abstract

Polarised infrared spectra of synthetic single crystals and radiation-damaged natural samples were collected to examine hydroxyl incorporation in monazite. The IR spectra of pure synthetic monazite contain two OH stretching bands at 3163 and approximately 3335 cm (super -1) with contrasting bandwidths of approximately 40 and approximately 90 cm (super -1) , respectively. The two OH bands show strong pleochroism and dominant infrared absorption in the Y direction. The IR spectra of natural monazite contain a weak pleochroic OH band centred around 3400 cm (super -1) with a bandwidth of more than 200 cm (super -1) During step-heating experiments, this broad OH band split into several bands, and these bands differ from those observed in the spectra of synthetic samples. The OH stretching signals in the spectra of both natural and synthetic samples disappeared after heating at 1000 degrees C. The H (sub 2) O concentration inferred from the infrared absorbance was 22(2) ppm in the synthetic monazite and 130-520 ppm in the natural samples. These results suggest that OH defects in natural monazite arise because of secondary hydration facilitated by radiation damage, as in the case of natural zircon and xenotime.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 29
Serial Issue: 6
Title: Infrared spectroscopic study of OH defects in monazite
Affiliation: Tohoku University, Department of Earth Science, Sendai, Japan
Pages: 949-957
Published: 20170628
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 72
Accession Number: 2017-082602
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201743
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