Research BaTiO₃ performance of heat conduction by laser photothermal technique

The thermal diffusivities of BaTiO₃ materials are studied. Thermal diffusivities of BaTiO₃ materials are measured by laser photothermal deflection technique. An intensity-modulated Ar+ laser beam was used as the incident light. Photothermal deflection signal as a function of different frequencies was experimentally measured. Using the signal, diffusivities can be obtained directly by fitting experimental data. The defect of error large in 'Mirage effect' is overcome. The diffusivities are measured at different pressures and sintering temperatures. The experimental results of materials are analyzed and discussed.