Synthesis and Microstructure of Highly Oriented PbTiO3 Thin Films Prepared by a Sol-Gel Method
Abstract
While orientation of microstructure to enhance electrical characteristics is, in general, not a major issue in the development of ceramic dielectrics, there are specific exceptions where system performance is improved by film orientation. The electrical poling of ferroelectric ceramics to produce piezoelectric transducer and pyroelectric detector components is a case in point. Relative to thin film devices, there is, then, the need to develop economical processes for the fabrication of highly oriented ferroelectrics. In this work, the sol-gel method was investigated as a potential technique for the deposition of oriented and epitaxial PbTiO3 thin films. Thin films of PbTiO3 were deposited on fused silica, resistor-grade alumina, and single crystal (100) MgO by a sol-gel processing method. While the films deposited on silica and alumina substrates were randomly oriented and polycrystalline, highly (100) oriented PbTi03 films were grown on the MgO single crystals. The peroviskite- type structure was observed with films deposited on the single crystal MgO and annealed at temperatures as low as 470 C, while a pyrochlore-type structure was observed with films of fused silica and alumina processed in a similar manner. All films heat treated at temperatures in excess of 570 C showed significant formation of a second PbTi3O7 phase. The films were characterized by electron microscopy and glancing-incidence angle X-ray diffraction.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1989
- Accession Number
- ADA211735
Entities
People
- Chiahong Chen
- Daniel F. Ryder Jr.
- William A. Spurgeon