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A high temperature in situ single-crystal study of P4/n vesuvianite

Mario Tribaudino and Mauro Prencipe
A high temperature in situ single-crystal study of P4/n vesuvianite
European Journal of Mineralogy (December 1999) 11 (6): 1037-1042

Abstract

Single crystal X-ray diffraction data were collected at T = 570, 770, 1070 K on a sample of a P4/n vesuvianite from Val d'Ala (Piedmont, Italy). Structure refinements yielded R values of 6.7, 6.8 and 8.5% for the three temperatures, respectively; the P4/n symmetry was retained throughout. The volume thermal expansion coefficient was 33.7(7) . 10 (super -6) K (super -1) ; different expansion rates were observed along the a and c directions [10.4(3) . 10 (super -6) K (super -1) and 12.9(3) . 10 (super -6) K (super -1) respectively]. The volume expansion is larger than that observed in the structurally similar garnet, due to a higher expansion rate along the c axis. An analysis of the atomic displacement parameters (ADP's) with temperature performed on Ca(2) and Ca(3) atoms did not indicate significant positional disorder. As well no evidence of changes in the cation distribution was found in the Ca(4)a and b and M(2)a and b sites even after prolonged heating at 1070 K.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 6
Title: A high temperature in situ single-crystal study of P4/n vesuvianite
Affiliation: Universita di Torino, Dipartimento di Scienze Mineralogiche e Petrologiche, Turin, Italy
Pages: 1037-1042
Published: 199912
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 28
Accession Number: 2000-026836
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N44°04'60" - N46°28'60", E06°37'60" - E09°10'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200009
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