Photoacoustic signals from the ceramic are analyzed, as a function of temperature close to structural phase transition from tetragonal to cubic at The amplitude of the signals depends on the changes of the thermoelastic properties in the ceramic with temperature. The Curie temperature value for the phase change was reproducible and was found to be A comparative analysis of this result with the differential thermal analysis and permittivity techniques is performed. Two changes of sign in the photoacoustic signal are observed, associated with the thermal expansion coefficient behavior in this material near the transition.
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1998
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