Thermal characterisation of nanocrystalline porous CePO4 ceramics

Sajan Daniel George (1) , Rajesh Komban (2) , K. G. K. Warrier (2) , P Radhakrishnan (3) , V. P. N. Nampoori (3) , C. P.G. Vallabhan (3)

1 Center of Smart Interfaces
2 Ceramic Technology Division
3 CUSAT - Cochin University of Science and Technology

In this work, laser induced photoacoustic technique has been employed to investigate thermal transport through nanocrystalline CePO4 samples prepared via sol-gel route. Evaluation of thermal diffusivity is carried out using one-dimensional model of Rosencwaig and Gersho in the reflection configuration of photoacoustic method. Structural analyses of samples show that they are nano porous in nature, possessing micron sized grains. Analysis of results shows that thermal diffusivity value varies with sintering temperature. Results are explained in terms of the variation in porosity with sintering temperature and the effects of various scattering mechanisms on the propagation of phonons through the nanoporous ceramic matrix. Further analyses confirm that apart from porosity, grain boundary resistance and interface thermal resistance influence the effective value of thermal diffusivity of samples under investigation.

Mots clés: Physical Sciences

Sajan Daniel George, Rajesh Komban, K. G. K. Warrier, P Radhakrishnan, V. P. N. Nampoori, et al.. Thermal characterisation of nanocrystalline porous CePO4 ceramics. Philosophical Magazine, 2010, 90 (06), pp.717-729. ⟨10.1080/14786430903246312⟩. ⟨hal-00562292⟩