Photoacoustic thermal characterization of porous rare-Earth phosphate ceramics

Sajan D. George, Rajesh Komban, K. G K Warrier, P. Radhakrishnan, V. P N Nampoori, C. P G Vallabhan

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The laser induced non-destructive photoacoustic technique has been employed to measure the thermal diffusivity of lanthanum phosphate ceramics prepared by the sol-gel route. The thermal diffusivity value was evaluated by knowing the transition frequency between the thermally thin to thermally thick region from the log-log plot of photoacoustic amplitude versus chopping frequency. Analysis of the data was carried out on the basis of the one-dimensional model of Rosencwaig and Gersho. The present investigation reveals that the sintering temperature has great influence on the propagation of heat carriers and hence on the thermal diffusivity value. The results were interpreted in terms of variations in porosity with sintering temperature as well as with changes in grain size.

Original languageEnglish
Pages (from-to)123-132
Number of pages10
JournalInternational Journal of Thermophysics
Volume28
Issue number1
DOIs
Publication statusPublished - 01-02-2007

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes
  • Physics and Astronomy (miscellaneous)

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