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

doi:10.1007/s10765-007-0153-7

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

Department of Atomic and Molecular Physics, Manipal

Research output: Contribution to journal › Article › peer-review

15 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 language	English
Pages (from-to)	123-132
Number of pages	10
Journal	International Journal of Thermophysics
Volume	28
Issue number	1
DOIs	https://doi.org/10.1007/s10765-007-0153-7
Publication status	Published - 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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10.1007/s10765-007-0153-7

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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.",

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AU - George, Sajan D.

AU - Komban, Rajesh

AU - Warrier, K. G K

AU - Radhakrishnan, P.

AU - Nampoori, V. P N

AU - Vallabhan, C. P G

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AB - 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.

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Photoacoustic thermal characterization of porous rare-Earth phosphate ceramics

Abstract

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