Photoacoustic thermal characterization of Al2O3-Ag ceramic nanocomposites

Sajan D. George; Aji A. Anappara; P. R S Warrier; K. G K Warrier; P. Radhakrishnan; V. P N Nampoori; C. P G Vallabhan

doi:10.1016/j.matchemphys.2008.03.009

Photoacoustic thermal characterization of Al₂O₃-Ag ceramic nanocomposites

Sajan D. George, Aji A. Anappara, P. R S Warrier, 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

8 Citations (Scopus)

Abstract

Laser-induced nondestructive photoacoustic (PA) technique has been employed to determine the thermal diffusivity of nanometal (Ag) dispersed ceramic alumina matrix sintered at different temperatures. The thermal diffusivity values are evaluated by knowing the transition frequency from the amplitude spectrum of PA signal using the one-dimensional heat flow model of Rosencwaig and Gersho. Analysis of the data shows that heat transport and hence the thermal diffusivity value is greatly affected by the influence of incorporation of foreign atom. It is also seen that sintering temperature affects the thermal diffusivity value in a substantial manner. The results are interpreted in terms of variation in porosity and carrier-assisted heat transport mechanism in nanometal dispersed ceramics.

Original language	English
Pages (from-to)	38-41
Number of pages	4
Journal	Materials Chemistry and Physics
Volume	111
Issue number	1
DOIs	https://doi.org/10.1016/j.matchemphys.2008.03.009
Publication status	Published - 15-09-2008

All Science Journal Classification (ASJC) codes

Materials Chemistry

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10.1016/j.matchemphys.2008.03.009

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title = "Photoacoustic thermal characterization of Al2O3-Ag ceramic nanocomposites",

abstract = "Laser-induced nondestructive photoacoustic (PA) technique has been employed to determine the thermal diffusivity of nanometal (Ag) dispersed ceramic alumina matrix sintered at different temperatures. The thermal diffusivity values are evaluated by knowing the transition frequency from the amplitude spectrum of PA signal using the one-dimensional heat flow model of Rosencwaig and Gersho. Analysis of the data shows that heat transport and hence the thermal diffusivity value is greatly affected by the influence of incorporation of foreign atom. It is also seen that sintering temperature affects the thermal diffusivity value in a substantial manner. The results are interpreted in terms of variation in porosity and carrier-assisted heat transport mechanism in nanometal dispersed ceramics.",

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T1 - Photoacoustic thermal characterization of Al2O3-Ag ceramic nanocomposites

AU - George, Sajan D.

AU - Anappara, Aji A.

AU - Warrier, P. R S

AU - Warrier, K. G K

AU - Radhakrishnan, P.

AU - Nampoori, V. P N

AU - Vallabhan, C. P G

PY - 2008/9/15

Y1 - 2008/9/15

N2 - Laser-induced nondestructive photoacoustic (PA) technique has been employed to determine the thermal diffusivity of nanometal (Ag) dispersed ceramic alumina matrix sintered at different temperatures. The thermal diffusivity values are evaluated by knowing the transition frequency from the amplitude spectrum of PA signal using the one-dimensional heat flow model of Rosencwaig and Gersho. Analysis of the data shows that heat transport and hence the thermal diffusivity value is greatly affected by the influence of incorporation of foreign atom. It is also seen that sintering temperature affects the thermal diffusivity value in a substantial manner. The results are interpreted in terms of variation in porosity and carrier-assisted heat transport mechanism in nanometal dispersed ceramics.

AB - Laser-induced nondestructive photoacoustic (PA) technique has been employed to determine the thermal diffusivity of nanometal (Ag) dispersed ceramic alumina matrix sintered at different temperatures. The thermal diffusivity values are evaluated by knowing the transition frequency from the amplitude spectrum of PA signal using the one-dimensional heat flow model of Rosencwaig and Gersho. Analysis of the data shows that heat transport and hence the thermal diffusivity value is greatly affected by the influence of incorporation of foreign atom. It is also seen that sintering temperature affects the thermal diffusivity value in a substantial manner. The results are interpreted in terms of variation in porosity and carrier-assisted heat transport mechanism in nanometal dispersed ceramics.

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Photoacoustic thermal characterization of Al₂O₃-Ag ceramic nanocomposites

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