The Influence of Porosity on the Electromechanical and Pyroelectric Properties of Ca-Modified PbTiO3 Thin Films
Author: Seifert, A.
Source: Journal of Sol-Gel Science and Technology, Volume 16, Number 1-2, October 1999 , pp. 13-20(8)
Abstract:The properties of Pb_1 − xCa_xTiO_3 (x = 0–30) thin films for electromechanical and pyroelectric applications can be further improved if porous, low-dielectric constant layers are being used. The electric field dependent strain, piezoelectric coefficient, pyroelectric coefficient and the pyroelectric figure of merit were evaluated as a function of the Ca-content and relative density of the thin films. The heating-rate during the final anneal was observed to be the controlling parameter for the evolution of either dense or porous microstructures. Both 2-methoxyethanol and 1,3-propanediol based solution precursors were used for spin-coating platinized Si_3N_4/SiO_2/Si wafers. Microstructure-property relationships and electrical properties concerning the domain mobility were examined.
Document Type: Regular Paper
Affiliations: Ceramics Laboratory, Materials Department, EPFL, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland
Publication date: October 1, 1999