Photoacoustic thermal characterization of Al2O3-Ag ceramic nanocomposites

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Title:	Photoacoustic thermal characterization of Al2O3-Ag ceramic nanocomposites
Authors:	Sajan, D G Aji, A A Warrier, P R S Warrier, K G K Radhakrishnan, P Nampoori, V P N Vallabhan, C P G
Keywords:	Sol-gel ceramics Thermal properties Nano-composite Diffusivity measurements Conductivity
Issue Date:	2008
Publisher:	Elsevier
Citation:	Materials Chemistry and Physics 111(1):38-41;15 Sep 2008
Abstract:	aser-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 knowingthe 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 nanornetal dispersed ceramics. photoacoustic
URI:	http://ir.niist.res.in:8080/jspui/handle/123456789/2090
ISSN:	0254-0584
Appears in Collections:	2008

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