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Novel results on thermal diffusivity measurements on anisotropic materials using photothermal methods
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10.Our measured values of the thermal diffusivity along the principal axes are as follows: and , giving an anisotropy ratio of 145. This ratio is close to the thermal conductivity ratio provided by the manufacturer: W/mK and =3.5 W/mK, yielding an anisotropy ratio of 200 (Research and PVD Materials Corporation catalog). Moreover, Touloukian et al. give a value for , very similar to our measured value [L. R. Touloukian, R. W. Powell, C. Y. Ho, and M. C. Nicolasu, Thermal Diffusivity (IFI/Plenum, New York, 1973)]. However, as pointed out by the reviewer the PG has thermal conductivities: W/mK and W/mK, giving an anisotropy ratio of 333 (MacMillan’s Chemical and Physical Data 1992). We think that this discrepancy could arise from different manufacturing processes of the samples.
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