Accessible Requires Authentication Published by Oldenbourg Wissenschaftsverlag September 25, 2009

High temperature crystal structure of a 3:2 mullite from neutron diffraction data

G. Brunauer, H. Boysen, F. Frey, T. Hansen and W. Kriven

Abstract

High temperature neutron investigations up to 1950 K of 3:2-sintered mullite show a smooth reversible behaviour which can be described by a rotation of more or less rigid TO4 (T = Al(2),Si)-tetrahedra and accompanying distortions of the Al(1)O6-octahedra. Large atomic dispacement parameters along the c-direction, including static parts, match to respective structural modulations in the mullite structure. A comparison of a pristine and a preheated sample reveals an irreversible depopulation of the Al(2) atomic site in favour of the Al(*) site.

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Published Online: 2009-9-25
Published in Print: 2001-5-1

© 2001 Oldenbourg Wissenschaftsverlag GmbH