Cation vacancies in doped zirconolite (CaZrTi2O7)

An attempt was made to create calcium site vacancies in 2M zirconolite via two trivalent Gd ions substituting for three Ca ions using stoichiometric measurements from electron microscopy and positron annihilation lifetime spectroscopy to detect the vacancies. For comparison, charge compensated (Gd,A...

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Bibliographic Details
Published in:Journal of materials science 2005-11, Vol.40 (22), p.6029-6032
Main Authors: HADLEYJR, J. H, HSU, F. H, VANCE, E. R, COLELLA, M, SMITH, K. L, LUMPKIN, G. R, CARTER, M. L, BEGG, B. D
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals
microstructure
Exact sciences and technology
Interaction between different crystal defects
gettering effect
Miscellaneous
Physics
Structure of solids and liquids
crystallography
Technical ceramics
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Summary:An attempt was made to create calcium site vacancies in 2M zirconolite via two trivalent Gd ions substituting for three Ca ions using stoichiometric measurements from electron microscopy and positron annihilation lifetime spectroscopy to detect the vacancies. For comparison, charge compensated (Gd,Al)-doped 2M zirconolite and a near single-phase 4M zirconolite were studied together with two Nd-bearing zirconolite compositions. It was concluded that cation vacancies may be present at levels of up to 0.05 formula units in zirconolite, depending on the starting stoichiometries, when the materials are prepared by sintering at 1400-1500 C. 11 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-4559-y