engleski

Influence of Piezoelectric Anisotropy on Electromechanical performance of Ultrasound NDT Probes at Eleveted Temperatures

When designing an ultrasound NDT probe for high temperature applications, one has to take into account a multitude of temperature induced effects, such as the temperature dependence of key physical properties of probe building materials. In this work, the significant influence of temperature change on piezoelectric properties and its anisotropy, and thus on the ultrasound properties of the whole probe, is discussed theoretically, within the thermodynamic Landau-Ginzburg-Devonshire framework and KLM model of equivalent circuits, for two different piezoelectric, acoustically active probe materials from the same family - barium titanate and lead titanate. These two materials are model materials for the whole family of piezoelectric perovskites, including the commercially widely used PZT and relaxor-ferroelectrics PMN-PT and PZN-PT.

non-destructive testing; ultrasound transducer; piezoelectric ceramic; piezoelectric anisotropy

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