Abstract
Calcium modified lead titanate (PT) thick films (thicknesses from 50 to 130 μm) are deposited by screen-printing on alumina substrates. First, the influence of the Ca-doping process and of the grain size distribution on the film quality and the piezoelectric coefficients is studied. The permittivity and charge coefficient d33 values of the films are compared with bulk ceramics ones. The consequences of very low coupling planar factors for PT are discussed. Piezoelectric and elastic properties are calculated with the help of a plane wave model which takes into account the three layers: substrate, electrodes and PT layer.
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