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Journal Articles Ceramics International Year : 2009

Densification and grain growth during solid state sintering of LaPO4

Abstract

This work is devoted to the kinetic study of densification and grain growth of LaPO4 ceramics. By sintering at a temperature close to 1500 degrees C, densification rate can reach up to 98% of the theoretical density and grain growth can be controlled in the range 0.6-4 mu m. Isothermal shrinkage measurements carried out by dilatometry revealed that densification occurs by lattice diffusion from the grain boundary to the neck. The activation energy for densification (E-D) is evaluated as 480 +/- 4 kJ mol(-1). Grain growth is governed by lattice diffusion controlled pore drag and the activation energy (E-G) is found to be 603 +/- 2 kJ mol(-1). The pore mobility is so low that grain growth only occurs for almost fully dense materials.

Dates and versions

emse-00446160 , version 1 (12-01-2010)

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Damien Bregiroux, F. Audubert, Didier Bernache-Assollant. Densification and grain growth during solid state sintering of LaPO4. Ceramics International, 2009, 35 (3), pp.1115-1120. ⟨10.1016/j.ceramint.2008.05.005⟩. ⟨emse-00446160⟩
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