Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-16T01:16:24.130Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Anderson, P.A.M. and Kleppa, O.J. (1969) The thermochemistry of the kyanite-sillimanite equilibrium. American Journal of Science, 267, 285–290.CrossRefGoogle Scholar
Bohlen, S.R., Montana, A. and Kerrick, D.M. (1991) Precise determinations of the equilibria kyanite-sillimanite and kyanite-andalusite and a revised triple point for Al2SiO5 polymorphs. American Mineralogist, 76, 677–680.Google Scholar
Brace, W.F., Scholz, C.H. and LaMori, P.N. (1969) Isothermal compressibility of kyanite, andalusite and sillimanite from synthetic aggregates. Journal of Geophysical Research, 74, 2089–2098.CrossRefGoogle Scholar
Burnham, C.W. (1963) Refinement of the crystal structure of kyanite. Zeitschrift fur Kristallographie, 118, 337–360.CrossRefGoogle Scholar
Comodi, P., Zanazzi, P.F., Poli, S. and Schmidt, M.W. (1997) High-pressure behaviour of kyanite; compressibility and structural deformations. American Mineralogist, 82, 452–459.CrossRefGoogle Scholar
Friedrich, A., Kunz, M., Winkler, B. and Le Bihan, T. (2004) High-pressure behaviour of sillimanite and kyanite: Compressibility, decomposition and indication of a new high-pressure phase. Zeitschrift fur Kristallographie, 219, 324–329.Google Scholar
Harben, P.W. (1999) Sillimanite minerals. Pp. 191–193 in: The Industrial Minerals Handbook HI. Industrial Minerals Information Ltd., Surrey, UK.Google Scholar
Hazen, R.M. and Finger, L.W. (1985) Crystals at high pressure. Scientific American, 252, 110–117.CrossRefGoogle Scholar
Holdaway, M.J. (1971) Stability of andalusite and the aluminum silicate phase diagram. American Journal of Science, 271, 97–231.CrossRefGoogle Scholar
Kerrick, D.M. (1990) The Al2SiO5 Polymorphs (Monograph). Reviews in Mineralogy, 22. Mineralogical Society of America, Washington, D.C., 406 pp.CrossRefGoogle Scholar
Larson, A.C. and Von Dreele, R.B. (1994) GSAS: General Structure Analysis System. Document LAUR 86-748, Los Alamos National Laboratory, New Mexico, USA.Google Scholar
Molin, G., Martignago, F. and Dal Negro, A. (2001) A new radiative microfurnace for X-ray single-crystal diffractometry. European Journal of Mineralogy, 13, 557–563.CrossRefGoogle Scholar
Naray-Szabo, S., Taylor, W.H. and Jackson, W. (1929) The structure of kyanite. Zeitschrift für Kristallographie, 71 117–130.Google Scholar
Ohashi, Y. (1982) STRAIN: A program to calculate the strain tensor from two sets of unit-cell parameters. Pp. 92–102 in: Comparative Crystal Chemistry (Hazen, R.M. and Finger, L.W., editors). Wiley & Sons, New York.Google Scholar
Ribbe, P.H. (1982) Kyanite, andalusite and other aluminum silicates. Pp. 189–214 in: Ortho-silicates (Ribbe, P.H., editor). Reviews in Mineralogy, 5 (2nd edition). Mineralogical Society of America, Washington, D.C.Google Scholar
Richardson, S.W., Gilbert, M.C. and Bell, P.M. (1969) Experimental determination of kyanite-andalusite and andalusite-sillimanite equilibria; the aluminum silicate triple point. American Journal of Science, 267, 259–272.CrossRefGoogle Scholar
Schafer, W., Jansen, E., Skowronek, R. and Kirfel, A. (1997) The twin-diffractometer SV7 at the FRJ-2 as a workhorse for structure and texture research. Physica B, 234-236, 1146–1148.CrossRefGoogle Scholar
Schäfer, W., Kirfel, A., Phiesel, H. and Skowronek, R. (2004) Construction and tests of a low-cost furnace for neutron powder diffractometry. Physica B, 350, e751–e754.CrossRefGoogle Scholar
Schmidt, M.W., Poli, S., Comodi, P. and Zanazzi, P.F. (1997) High-pressure behaviour of kyanite; decomposition of kyanite into stishovite and corundum. American Mineralogist, 82, 460–466.CrossRefGoogle Scholar
Skinner, B.J., Clark, S.P. and Appleman, D.E. (1961) Molar volumes and thermal expansions of andalu-site, kyanite, and sillimanite. American Journal of Science, 259, 651–668.CrossRefGoogle Scholar
Tribaudino, M., Nestola, F., Camara, F. and Domeneghetti, M.C. (2002) The high-temperature P21/c-C2/c phase transition in Fe-free pyroxene (Ca0.15Mg1.85Si2O6): Structural and thermodynamic behaviour. American Mineralogist, 87, 648–657.CrossRefGoogle Scholar
Winter, J.K. and Ghose, S. (1979) Thermal expansion and high-temperature crystal chemistry of the Al2SiO5 polymorphs. American Mineralogist, 64, 573–586.Google Scholar
Yang, H., Downs, R.T., Finger, L.W., Hazen, R.M. and Prewitt, C.T. (1997) Compressibility and crystal structure of kyanite, Al2SiO5, at high pressure. American Mineralogist, 82, 467–474 CrossRefGoogle Scholar
Supplementary material: PDF

Gatta et al. supplementary material

Tables 2 and 3

Download Gatta et al. supplementary material(PDF)
PDF 65.3 KB