Abstract
A modified technique of scanning electron-acoustic microscopy isemployed to determine thermal diffusivity of materials. Using thedependence of the electron-acoustic signal on modulation frequency ofthe electron beam, the thermal diffusivity of materials ischaracterized based on a simplified thermoelastic theory. The thermaldiffusivities of several metals characterized by the modified scanningelectron-acoustic microscopy are in good agreement with the referentialvalues of the corresponding materials, which proves that the scanningelectron-acoustic microscopy can be used to characterize the thermaldiffusivity of materials effectively. In addition, formicro-inhomogeneous materials, such as biological tissues, themacro-effective (average) thermal diffusivities are characterized bythe technique.
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