Abstract
The ferroelectric properties of calcium modified lead titanate (Pb 0.76 Ca 0.24 )TiO 3 (PTCa) thin films prepared by a sol - gel method with successive crystallisations on three different substrates (A) Pt/Ti/SiO 2 /Si (100), (B) Ti/Pt/Ti/SiO 2 /Si(100) y (C) Pt/TiO 2 /SiO 2 /Si (100), have been studied. The results of the ferroelectric characterisation show values of the spontaneous pyroelectric coefficient close to = 5.10 -9 C cm -2 K -1 . The low switching properties favour the stabilisation in time of the pyroelectric coefficient value. A latter annealing thermal treatment (650°C 1h) produces changes in the ferro - piezoelectric properties that can be related with changes in the texture of the films.
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