ULTRA-FINE PARTICLE SIZE FERROELECTRICS.
Quarterly progress rept. no. 6, 16 July-15 Oct 63,
HORIZONS RESEARCH INC CLEVELAND OH
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Efforts were continued on the preparation of controlled particle size polycrystalline dielectric films of ferroelectric materials and theoretical studies of the fine-particle effect on the behavior of ferroelectric materials. Development was started on an apparatus to sinter barium titanate layers by passing them very slowly under an incandescent wire. It was discovered that the hot wire alone would not provide enough heat to densify a sample. An auxiliary heater was placed under the setter which held the sample, and effort was devoted to reducing heat loss to the environment. An additional study of densification has indicated that a short firing in a furnace at a high temperature 2650 F or greater is at least as effective as extended, multi-temperature cycles. Whereas all previous firings had involved a single barium titanate layer, several experiments were tried with stacks of as many as 9 layers, some with coatings of platinum paste to serve as electrodes. Much of the trouble previously encountered with barium titanate adhering to or reacting with setter materials vanished when multiple layers were used. The resulting flat, uniform stacks were embedded in resin for safe handling and sanded down on the ends for application of electrodes. Author