Accession Number : AD0639226

Title :   PROPERTIES OF ULTRAFINE GRAINED BATI03 SUPER-PRESSED AT LOW TEMPERATURES.

Descriptive Note : Technical rept.

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Brandmayr,R. J.

Report Date : AUG 1966

Pagination or Media Count : 30

Abstract : High purity, ultra-fine-grained BaTi03 powder has been densified by 'squeezing' in a hexahedral press at pressures of 50 kilobars and temperatures in the range of 125 to 720 C. X-ray diffraction patterns of the pressed material indicate that strain and/or particle reduction have resulted from application of the pressure. Electrical data show that a wide range of dielectric constants were obtained for these bodies, depending on the pressing temperatures. The bodies showed a high degree of temperature stability of dielectric constant due to complete suppression of the curie temperature. Samples having an ultra-fine grained (0.05 microns), uniform microstructure have been obtained. (Author)

Descriptors :   (*CERAMIC MATERIALS, COMPACTING), (*BARIUM COMPOUNDS, TITANATES), FERROELECTRIC MATERIALS, DIELECTRICS, HOT WORKING, GRAIN SIZE, DIELECTRIC PROPERTIES, MICROSTRUCTURE, X RAY DIFFRACTION

Subject Categories : Ceramics, Refractories and Glass
      Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE