Accession Number : AD0476709

Title :   INORGANIC DIELECTRICS RESEARCH.

Descriptive Note : Quarterly progress rept. no. 7, 15 May-15 Aug 65,

Corporate Author : NEW JERSEY CERAMIC RESEARCH STATION NEW BRUNSWICK

Personal Author(s) : Smoke, Edward J. ; Kastenbein, Ernest L. ; Pitetti, Raymond C. ; Rankin, D. Thomas ; Wichansky, Howard

Report Date : 15 AUG 1965

Pagination or Media Count : 96

Abstract : The program includes four phases. Under High Temperature Extrusion of Ferroelectric Materials, coextrusion of Bi4Ti3O12 in 1018 steel resulted in dense but non-uniform ceramics. BaTiO3 plus 2.5% BaO3 gave similar results while additions of 5% resulted in good ceramics. Boron nitride shows promise as a separating media, which along with a thin monel sheath, allows for easy removal of the ceramic from the coextruded can. Under Low Loss Microwave Ceramic Dielectrics, selected compositions in the BaTiO3.MgTiO3.FeSnO3 system have been made and evaluated for their T.C. properties, and are compared to several other compositional systems exhibiting zero T.C. characteristics. The high frequency (8.6 KMc) properties of several compositions are presented. Under Devitrification Techniques For Ferroelectric Materials, the melting and specimen forming operations are discussed along with results realized for compositions evaluated in the BaO.TiO2.B2O3 system. Electrical and T.C. Properties are reported. Under Structure Studies of High Density Polycrystalline Ceramics, specimens made of the three ultra-pure barium titanates have been fired to several additional temperatures thus extending the range under study from 1325 to 1525 C. The T.C. properties have been determined. In general the dielectric constants range from 1750 to 2100 with some volumes up to 2700. The power factors range from .008 to above .020. (Author)

Descriptors :   *DIELECTRICS), (*CERAMIC MATERIALS, (*TITANATES, MATERIAL FORMING), FERROELECTRIC MATERIALS, BARIUM COMPOUNDS, BISMUTH COMPOUNDS, EXTRUSION, HEAT TREATMENT, ELECTRICAL PROPERTIES, CRYSTAL STRUCTURE, DIELECTRIC PROPERTIES, MAGNESIUM COMPOUNDS, BORON COMPOUNDS, OXIDES, DENSITY, MICROWAVE FREQUENCY, MICROSTRUCTURE, HIGH TEMPERATURE.

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE