Microstructural evolution of dense and porous pyroelectric Pb1-xCaxTiO3 thin films

Pb1-xCaxTiO3 thin films with x = 0-0.3 for pyroelectric applications were deposited on platinized silicon wafers by chemical solution processing. Ca-substitution for Pb in PbTio(3) results in a reduced cia ratio of the unit cell, which, in turn, leads to better pyroelectric properties. Control of nucleation and growth during rapid thermal annealing to 650 degrees C allowed the formation of either highly porous or dense (111) oriented films. The inclusion of pores creates a matrix-void composite with the low permittivity desired for pyroelectric applications, resulting in a high figure of merit. The growth mechanisms for the microstructural evolution of both dense and porous films were analyzed by x-ray diffraction, transmission electron microscopy, scanning electron microscopy, and Rutherford backscattering spectrometry and allowed establishment of microstructure/property relationships.


Published in:
Journal of Materials Research, 14, 5, 2012-2022
Year:
1999
ISSN:
0884-2914
Keywords:
Note:
Seifert, A Ecole Polytech Fed Lausanne, Dept Mat, Lab Ceram, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, Dept Mat, Lab Ceram, CH-1015 Lausanne, Switzerland
235PD
Times Cited:18
Cited References Count:39
Laboratories:




 Record created 2006-08-21, last modified 2018-12-03


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