Crystallization and Microstructural Control of Ferroelectric Thin-Films and Glass-Ceramics
Interim rept. 1 Mar 92-30 Sep 93,
COLORADO SCHOOL OF MINES GOLDEN DEPT OF METALLURGICAL ENGINEERING
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Research on solution-derived ferroelectric thin-films and melt- derived ferroelectric glass-ceramics is being conducted in parallel with considerable overlap in the compositions studied and the evaluations of the crystallization behavior, microstructural development, and resulting properties. By establishing the similarities and differences between the two systems, techniques developed for one technology can then be applied to advance the other. The investigation is focusing on the PbZrxTil-xO3-Pb5Ge3O11 PZTPG system. Compositions from this system combine the glass forming ability and low processing temperatures of PG with the excellent electrical properties of PZT. These compositions crystallize into multiple ferroelectric phases, and thus by controlling the ratios of these phases unique combinations of properties may be possible. The high PG compositions are being investigated for pyroelectric applications, while the high PZT compositions are of interest for piezoelectric applications. This program appears to be the first to investigate melt-derived PG-PZT compositions, crystallize multiple ferroelectric phases, and crystallize PZT from a glass. This research demonstrates the feasibility of developing piezoelectric glass-ceramics with low processing temperatures that utilize powder processing techniques, such as pressing, screen printing, or tape casting, and indicates the potential of incorporation of these materials into low-fired multilayer packages as a sensors or actuators.
- Electrical and Electronic Equipment
- Ceramics, Refractories and Glass