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Temperature-dependent absorption of biotite; small-polaron hopping and other fundamental electronic excitations

Claus H. Ruescher
Temperature-dependent absorption of biotite; small-polaron hopping and other fundamental electronic excitations (in The 7th European conference on Mineralogy and spectroscopy, Monika Koch-mueller (editor), Michael Fechtelkord (editor), Vladimir Khomenko (editor) and Sergio Speziale (editor))
European Journal of Mineralogy (September 2012) 24 (5): 817-822

Abstract

Temperature-dependent absorption investigations between 10 and 823 K reveal photon-assisted hopping (PAH) of small polarons in biotites as the dominating excitation in the near-infrared spectral range. These data show a transfer of oscillator strength of the PAH of small polarons to Fe (super 2+) -Fe (super 3+) intervalence-charge transfer and Fe (super 2+) d-d transitions with decreasing temperature. The loss in oscillator strength of PAH is related to a pinning of the polarons due to the decreasing number in lattice vibrations in thermal equilibrium.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 24
Serial Issue: 5
Title: Temperature-dependent absorption of biotite; small-polaron hopping and other fundamental electronic excitations
Title: The 7th European conference on Mineralogy and spectroscopy
Author(s): Ruescher, Claus H.
Author(s): Koch-mueller, Monikaeditor
Author(s): Fechtelkord, Michaeleditor
Author(s): Khomenko, Vladimireditor
Author(s): Speziale, Sergioeditor
Affiliation: Leibniz Universitaet Hannover, Institut fuer Mineralogie und Zentrum fuer Festkoerperchemie, Hannover, Germany
Affiliation: Deutsches GeoForschungsZentrum, Helmholtz-Zentrum Potsdam, Potsdam, Germany
Pages: 817-822
Published: 201209
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
Meeting name: The 7th European conference on Mineralogy and spectroscopy
Meeting location: Potsdam, DEU, Germany
Meeting date: 20110904Sept. 4-7, 2011
References: 27
Accession Number: 2012-086344
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Ruhr-Universitaet Bochum, DEU, Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201245
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