Dielectric porcelain composition and manufacture thereof

PURPOSE: To significantly reduce change in the dielectric constant of a lead- combined perovskite dielectric material due to temperature without significantly lowering the dielectric constant. CONSTITUTION: In a lead-combined perovskite dielectric porcelain composition, Pb(Mg 1/3 Nb 2/3 ) O 3 -PbTiO 3 --Pb(Mg 1/2 W 1/2 )O 3 , WO 3 is added by 1 to 10 parts by weight as additive to the main composition with the ranges of composition points as follows: A=(50, 30, 20), B=(40, 40, 20), C=(30, 40, 30), D=(30, 30, 40), E=(40, 20, 40) and F=(50, 20, 30). A core-shell structure of W and Nb is formed within the perovskite crystal grain. COPYRIGHT: (C)1993,JPO&Japio