Electric Response to Bending Vibrations and Pyroelectric Effect in Unpolarized Ferroelectric Ceramic Plates with Electrodes, Differing in the Magnitude of the Coefficient of Thermal Expansion on Opposite Surfaces

摘要

The manufacture of electrode materials by the methods of sintering and cathodic sputtering of metals with different coefficients of linear thermal expansion on opposite surfaces of unpolarized ferroelectric ceramics plates creates stationary gradients of mechanical deformations and stresses in specimens' volume. As a result, an electrical response to the three-point mechanical loading (flexural vibrations at the resonant frequency) and pyroelectric current in the dynamic mode of measurement were observed.