Accession Number : ADA337154

Title :   Crystallization and Microstructural Control of Ferroelectric Thin-Films and Glass-Ceramics.

Descriptive Note : Final rept. 1 Apr 95-31 Dec 97,

Corporate Author : COLORADO SCHOOL OF MINES GOLDEN DEPT OF METALLURGICAL ENGINEERING

Personal Author(s) : Haun, Michael J.

PDF Url : ADA337154

Report Date : 31 JAN 1998

Pagination or Media Count : 13

Abstract : Research on solution-derived ferroelectric thin-films and melt-derived ferroelectric glass-ceramics was conducted in parallel with considerable overlap in the compositions studied and the evaluations of the crystallization behavior, microstructural development, and resulting properties. Lead germane based ferroelectric thin films were developed with a room temperature pyroelectric coefficient over 90% of the single crystal value, and a pyroelectric figure of merit exceeding the highest reported value for oriented lead titanate films. New glass-ceramic compositions were developed based on the crystallization of ferroelectric phases of lead zirconate titanate and lead zinc niobate in lead borosilicate glass matrices. The compositions in glass powder form densified at temperatures less than 900 deg C by a combination of viscous and liquid phase sintering mechanisms. Crystallization of an interconnected microstructure of the ferroelectric phases was critical to produce ferroelectric properties, and allow electrical poling for piezoelectric and pyroelectric activity. This research demonstrates the feasibility of developing ferroelectric glass-ceramic compositions with low processing temperatures that utilize powder processing techniques, such as pressing, screen printing, or tape casting, and indicates the potential incorporation of these materials into multi-component microelectronic packages as sensors and actuators.

Descriptors :   *CRYSTALLIZATION, *GLASS, *CERAMIC MATERIALS, MICROSTRUCTURE, THIN FILMS, LEAD TITANATES, CASTING, ACTUATORS, FERROELECTRIC MATERIALS, PYROELECTRICITY, THICK FILMS, ZIRCONATES.

Subject Categories : Electrical and Electronic Equipment
      Ceramics, Refractories and Glass
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE