Accession Number : ADA193127

Title :   Preparation and Properties of High Q Microwave Dielectrics in the (CA, SR, BA) Zirconate System.

Descriptive Note : Rept. no. 15 (Final) 1 Oct 86-1 Oct 87,

Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Borglum, B P ; Buchanan, R C

PDF Url : ADA193127

Report Date : 28 Dec 1987

Pagination or Media Count : 26

Abstract : Effects of powder synthesis and processing parameters on non-stoichiometric CaZrO3 with added SrO and BaO were studied in order to optimize microstructure and microwave dielectric properties. Nitrate precursors of constituent oxides were in aqueous solutions to give the desired composition. The effect of solution pH (1-10) on powder characteristics and gel formation in the system were examined. Optimally high surface areas (31.4 sq.m./g), small particle size (0.05 microns), and uniform, dense microstructure were obtained only for the acidic (ph approx. 1) powders. Ceramic parts with uniform microstructures, high dielectric constants epsilon r = 30 - 35, and high Q ( 4000) were prepared from these powders.

Descriptors :   *CERAMIC MATERIALS, *DIELECTRIC PROPERTIES, *OXIDES, *POWDERS, CONSTANTS, ELECTROMAGNETIC PROPERTIES, GELS, HIGH DENSITY, MICROSTRUCTURE, MICROWAVES, NITRATES, PARAMETERS, PARTICLE SIZE, PARTS, PH FACTOR, PRECURSORS, PROCESSING, SOLUTIONS(MIXTURES), SURFACES, SYNTHESIS(CHEMISTRY), WATER

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE