Accession Number : ADA194955

Title :   Piezoelectric and Electrostrictive Materials for Transducer Applications. Volume 3.

Descriptive Note : Annual rept. 1 Jan-31 Dec 87,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Personal Author(s) : Cross, L E ; Newnham, R E ; Barsch, G R ; Biggers, J V

PDF Url : ADA194955

Report Date : Mar 1988

Pagination or Media Count : 186

Abstract : In the course of the development of a phenomenological theoretical model for the whole lead zirconate-titanate solid solution system, it was found that some of the required experimental information was missing. To permit these required measurements, pure homogeneous ceramic samples of specific PZT compositions were fabricated from sol-gel derived powders. This paper describes the preparation and characterization of these required compositions. High-purity lead acetate, titanium isopropoxide, and zirconium n-propoxide were used as precursors to form PZT powders using a sol-gel technique. X-ray powder diffraction was used to study the effect of calcining time and temperature from 400 to 900 C. The submicron-size calcined powders were sintered at temperatures from 1000 to 1250 C, depending on the composition, into high density (96 to 97% of the theoretical density) ceramic bodies with uniform microstructure. Excess lead oxide was included in the starting powders to control the lead stoichiometry and to act as a transient liquid phase to facilitate gain growth and densification by eliminating the porosity in the ceramics during sintering. The effects of density and of a second phase of lead oxide in the grain boundaries on the dielectric properties and poling characteristics are discussed.

Descriptors :   *ELECTROSTRICTION, *PIEZOELECTRIC MATERIALS, ACETATES, CERAMIC BODIES, CERAMIC MATERIALS, CONTROL, DENSITY, DIELECTRIC PROPERTIES, EXPERIMENTAL DATA, GAIN, GRAIN BOUNDARIES, GROWTH(GENERAL), HIGH DENSITY, HOMOGENEITY, LEAD COMPOUNDS, LEAD OXIDES, LIQUID PHASES, MATERIALS, MICROSTRUCTURE, MODELS, PHASE, POROSITY, POWDERS, PURITY, SAMPLING, SINTERING, STARTING, STOICHIOMETRY, TEMPERATURE, THEORY, TRANSDUCERS, TRANSIENTS, X RAY DIFFRACTION

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE