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On the thermo-elastic behaviour of kyanite: a neutron powder diffraction study up to 1200°C

Published online by Cambridge University Press:  05 July 2018

G.D. Gatta ,
F. Nestola  and
J.M. Walter
G.D. Gatta*
Affiliation:
Dipartimento di Scienze della Terra, Universita' degli Studi di Milano, Via Botticelli, 23, I-20133 Milano, Italy
F. Nestola
Affiliation:
Bayerisches Geoinstitut, Universitaet Bayreuth, Universitaet Str. 30, D-95447 Bayreuth, Germany Dipartimento di Mineralogia e Petrologia, Università degli Studi di Padova, Corso Garibaldi 37, I-35137 Padova, Italy
J.M. Walter
Affiliation:
Mineralogisch-Petrologisches Institut, Universität Bonn, Forschungszentrum Jülich, D-52425 Jülich, Germany
*
*E-mail: diego.gatta@unimi.it
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Abstract

The high-temperature (HT) behaviour of kyanite (Al2SiO5) was investigated by in situ neutron powder diffraction up to 1200°C. Within the investigated T range, no phase transition was observed. The axial and volume thermal expansion coefficient (αj = lj-1(𝜕1j/𝜕T), αv = V-1 (𝜕V/𝜕T)), calculated by weighted linear regression through the data points, are: αa = 5.5(2) x 10-5, αb= 5.9(2) x 10-5, αc = 5.18(8) xl0-5, αv = 7.4(1) x 10-3 “C-1, with αa:αb:αc = 1.06:1.14:1. All three angles of the kyanite lattice show a slight decrease with T, with 𝜕α/𝜕T = -2(2) x 10-5, 𝜕β/𝜕T = -4(1) x 10-5, 𝜕γ/𝜕T = –10(2) x 10-5%C. The magnitudes of the principal Lagrangian unit-strain coefficients (ε1,ε2, ε3) and the orientations of the thermal strain-ellipsoids, between the ambient temperature and each measured T, were calculated. The magnitude and the orientation of all the three unit-strain coefficients are almost maintained constant with T. At T-To = 1177°C , ε^a = 76(2)°, ε^b = 70(2)°, ε^c = 38(3)°, ε2^a = 49(3)°, ε2^b = 66(3)°, ε2^c = 127(4)°, ε3^a = 135(3)°, ε3^b = 31(3)°, ε3^c = 91(2)° with ε1:ε2:ε3 = 1.57:1.29:1. The structural refinements, performed at 23, 600, 650, 700, 750, 800, 900, 950, 1050 and 1200°C allowed the description of the structural evolution and the main T-induced deformation mechanisms, which are mainly represented by the polyhedral distortions of the AlO6 octahedra.

Keywords

kyaniteAl2SiO5neutron powder diffractionhigh temperaturethermal behaviour
Type
Research Article
Information
Mineralogical Magazine , Volume 70 , Issue 3 , June 2006 , pp. 309 - 317
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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