Sintering and microstructure of rare earth phosphate ceramics REPO4 with RE = La, Ce or Y

Sintering of rare earth phosphates REPO4 (RE=La, Ce or Y) was studied using dilatometry. The presence of a secondary rare earth metaphosphate phase RE(PO3)3 as sintering aid was investigated. It proved to accelerate the densification but it activated fast grain growth, which was very detrimental to...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2006, Vol.26 (3), p.279-287
Main Authors: BREGIROUX, D, LUCAS, S, CHAMPION, E, AUDUBERT, F, BEMACHE-ASSOLLANT, D
Format: Article
Language:English
Subjects:
Applied sciences
Bioengineering
Biomaterials
Building materials. Ceramics. Glasses
Ceramic industries
Chemical and Process Engineering
Chemical industry and chemicals
Engineering Sciences
Exact sciences and technology
Life Sciences
Miscellaneous
Technical ceramics
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Summary:Sintering of rare earth phosphates REPO4 (RE=La, Ce or Y) was studied using dilatometry. The presence of a secondary rare earth metaphosphate phase RE(PO3)3 as sintering aid was investigated. It proved to accelerate the densification but it activated fast grain growth, which was very detrimental to the microstructural design of processed ceramics. A temperature of 1400-1450DDGC was required to sinter pure LaPO4 and CePO4 ceramics with fine grains. Both compounds behave similar while YPO4 did not densify even at 1500DDGC. The influence of specific surface area of starting powders, temperature and holding time on the sintering rate and microstructures of dense REPO4 materials is also reported.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2004.11.004