SYNTHESIS AND PROPERTIES OF DIELECTRIC CERAMICS FROM METALLOORGANIC PRECURSORS THROUGH THE SOLID-STATE REACTION OF MIXED GELS

A perovskite structure of 0.4Pb(Mg1/3Nb2/3)O-3 . 0.3Pb(Mg1/2W1/2)O-3. 0.3PbTiO(3) was prepared from metallo-organic precursors through the s olid-state reaction of the mixed gels. Three types of mixed gels were crystallized to obtain PbTiO3, MgNb2O6, and MgWO4 powders. These powde rs were calcined at 900 degrees C after mixing with a stoichiometric a mount of Pb(CH3COO)(2) . 3H(2)O. The dielectric consitant of the ceram ic fired at 900 degrees C was improved by adding an excess of 10 mol% Mg(OC2H5)(2), and the ceramic achieved X7T specification of the Electr ic Industries Association standard. The dielectric loss was reduced by adding an excess of 5 mol% Pb(CH3COO)(2) .3H2O.