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(Fe,Mn)-Mg interdiffusion in natural diopside; effect of pO (sub 2)

Alexandre Dimanov and Michael Wiedenbeck
(Fe,Mn)-Mg interdiffusion in natural diopside; effect of pO (sub 2)
European Journal of Mineralogy (December 2006) 18 (6): 705-718

Abstract

The interdiffusion of (Fe,Mn)-Mg along the [001] axis in single crystals of natural diopside at ambient pressure, at temperatures between 1000 and 1300 degrees C, and at f(O (sub 2) ) between 10 (super -18.5) to 10 (super -6) atm was investigated. Thin layers ( approximately 350-550 Aa) of ferro-johannsenite deposited by plasma sputtering provided Fe and Mn for exchange with Mg from the diopside substrates. The interdiffusion profiles of Fe-Mg and Mn-Mg were analysed by SIMS in depth profiling mode. The (Fe,Mn)-Mg interdiffusion coefficient is strongly pO (sub 2) sensitive. At 1100 degrees C and between 10 (super -7 ) to 10 (super -15 ) atm the interdiffusion coefficient is proportional to approximately (pO (sub 2) ) (super m) indicative of an extrinsic point defects regime. A value of m of 0.22 + or - 0.02 as obtained, indicating a vacancy mechanism.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 18
Serial Issue: 6
Title: (Fe,Mn)-Mg interdiffusion in natural diopside; effect of pO (sub 2)
Affiliation: GeoForschungsZentrum Potsdam, Potsdam, Federal Republic of Germany
Pages: 705-718
Published: 200612
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 43
Accession Number: 2007-017123
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Ecole Polytechnique, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200710
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