We report the effect of sintering time on thermal diffusivity of BSCCO (Bi-Pb-Sr-Ca-Cu-O) superconductors doped with Sm with different concentration. The superconductor samples were sintered for 24, 48 and 100 hours respectively at 850 Celsius. Thermal diffusivity measurement was carried out at 80 - 300 K by using photoflash technique. The sintering time was found indirectly affect the thermal diffusivity in the way it influenced the grain size and grain alignment.
A numerical model of the heat conduction and laser beam deflection in a fluid heated by a thin, cylindrical resistance wire is presented. The model, developd using combined finite difference method technique is used to determine the temperature distribution in a test fluid sample and the heating wire. A probe laser beam passing through the sample is deflected by the refractive index gradient caused by the temperature gradient. The transient probe beam deflection can be recorded using a position sensitive detector. Simultaneous determination of the thermal diffusivity and thermal conductivity of the test fluid is possible by comparing the theoretical results of the probe beam deflection and the experimentally measured deflection.
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