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

Brunauer, G.; Boysen, Hans; Frey, Friedrich; Hansen, T. and Kriven, W.M. (2001): High temperature crystal structure of a 3:2 mullite from neutron diffraction data. In: Zeitschrift fur Kristallographie, Vol. 216, No. 5: pp. 284-290

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 displacement 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.

• Item Type: Journal article
• Faculties: Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science
• Subjects: 500 Science > 550 Earth sciences and geology
• Language: English