Accession Number : ADP007735

Title :   Effect of Powder Characteristics on Dielectric Properties Alumina Compacts,

Corporate Author : CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS MADRID (SPAIN)

Personal Author(s) : Moreno, R. ; Miranzo, P. ; Requena, J. ; Moya, J. S. ; Molia, J.

Report Date : 27 APR 1992

Pagination or Media Count : 9

Abstract : Three different submicronic alumina powders have been analyzed. The sintering and microstructural evolution of the different green compacts have been studied by dilatometry and SEM, respectively. Dense (> 99 % th) alumina samples were used for the measurement of the dielectric properties at 20 GHz. The dielectric properties have been related to the impurities content, grain size distribution, porosity, etc. The important effect of small quantities of MgO in solid solution on the microwave absorption of alumina compacts has been pointed out.

Descriptors :   *DIELECTRIC PROPERTIES, *MICROWAVES, *CERAMIC MATERIALS, ABSORPTION, DIELECTRICS, DISTRIBUTION, GRAIN SIZE, IMPURITIES, MEASUREMENT, POROSITY, POWDERS, QUANTITY, SINTERING, SOLID SOLUTIONS, SOLIDS, ALUMINUM OXIDES, POWDER ALLOYS, MAGNESIUM OXIDES, RADIATION ABSORPTION, SYMPOSIA.

Subject Categories : Ceramics, Refractories and Glass
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE