Acceptor Doping of Barium Strontium Titanate and Magnesium Oxide Composites
J. Synowczynski, G. Dewing, Richard G. Geyer, John H. Grosvenor Jr
The microwave dielectric properties of bulk barium strontium titanate and magnesium oxide ceramic composites are measured with cylindrical mode-filtered cavity and dielectric sleeve resonator techniques. The cylindrical wall of the mode- filtered cavity consists of wire wound belical waveguide, which permits the use of high-purity TFo1n resonant modes for high accuracy permittivity measurements. Employing low loss dielectric sleeve resonators allows dielectric characterization of rod specimens at frequencies nominally determined by the permittivity and aspect ratio of the sleeve resonator. Both temperature and frequency dispersion are examined for differing stoichiometric percentages of barium to strontium and for various weight percentages of added magnesium oxide.