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Synchrotron X-ray Diffraction Study of Ba4.5Nd9Ti18O54 Microwave Dielectric Ceramics at 10–295 K

Published online by Cambridge University Press:  31 January 2011

C. C. Tang ,
M. A. Roberts ,
F. Azough ,
C. Leach  and
R. Freer
C. C. Tang
Affiliation:
Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom
M. A. Roberts
Affiliation:
Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom
F. Azough
Affiliation:
Manchester Materials Science Centre, University of Manchester and UMIST, Manchester M1 7HS, United Kingdom
C. Leach
Affiliation:
Manchester Materials Science Centre, University of Manchester and UMIST, Manchester M1 7HS, United Kingdom
R. Freer
Affiliation:
Manchester Materials Science Centre, University of Manchester and UMIST, Manchester M1 7HS, United Kingdom
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Abstract

The structure of ceramic Ba4.5Nd9Ti18O54 was investigated by synchrotron x-ray powder diffraction from 10 to 295 K. Reitveld refinement and Le Bail profile analysis were applied to the data. Based on an orthorhombic structure, unit cell parameters of a = 22.3479(3) Å, b = 7.6955(1) Å, and c = 12.2021(2) Å were obtained at room temperature and a = 22.3367(5) Å, b = 7.6738(1) Å, and c = 12.1842(3) Å at 10 K. No evidence was found for any major structural change from 10 to 295 K. Within the tungsten bronze framework the two pentagonal channels were fully occupied by Ba; the remaining Ba atoms shared the rhombic channels with Nd. Thermal expansion of the unit cell was found to be anisotropic. The largest expansion occurs along the b cell edge, and the least along the a cell edge. It is proposed that the anisotropy is due to enhanced bending of the TiO6 polyhedra chains along the b direction.

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Articles
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Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 675 - 682
Copyright
Copyright © Materials Research Society 2002

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