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Deprotonation and order-disorder reactions as a function of temperature in a phengite 3T (Cima Pal, Western Alps) by neutron diffraction and Mossbauer spectroscopy

Alessandro Pavese, Nadia Curetti, Giovanni Ferraris, Gabriella Ivaldi, Umberto Russo and Richard Ibberson
Deprotonation and order-disorder reactions as a function of temperature in a phengite 3T (Cima Pal, Western Alps) by neutron diffraction and Mossbauer spectroscopy (in Special issue dedicated to the memory of Luciano Ungaretti, Maria Chiara Domeneghetti (prefacer))
European Journal of Mineralogy (April 2003) 15 (2): 357-363

Abstract

For a phengite 3T (K (sub 0.94) Na (sub 0.02) )(Al (sub 1.43) Mg (sub 0.33) Fe (sub 0.25) ) (Si (sub 3.47) Al (sub 0.53) )O (sub 10) (OH) (sub 2) , from Cima Pal, order is observed at room T in both tetrahedral (Si fully occupies T1) and octahedral (Al almost fills M2) sites. On heating to 873 K, deprotonation, Fe oxidation and inter-site cation re-ordering reactions occur. Al moves by approximately 0.1 atoms from M2 to M3, and is replaced by Mg and Fe; Fe (super 2+) and Fe (super 3+) occupy different M sites, after cooling, whereas Fe (super 2+) was partitioned on two sites, one shared with Fe (super 3+) , before heating.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 2
Title: Deprotonation and order-disorder reactions as a function of temperature in a phengite 3T (Cima Pal, Western Alps) by neutron diffraction and Mossbauer spectroscopy
Title: Special issue dedicated to the memory of Luciano Ungaretti
Affiliation: Universita di Milano, Dipartimento Scienze della Terra, Milan, Italy
Pages: 357-363
Published: 200304
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 25
Accession Number: 2003-032478
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N36°30'00" - N47°30'00", E06°30'00" - E19°00'00"
Secondary Affiliation: National Research Council, ITA, ItalyUniversita di Torino, ITA, ItalyUniversita di Padova, ITA, ItalyRutherford Appleton Laboratory, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200311
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