The Effect of Small Additions of Magnesia on some High-Permittivity Ceramics Based on Barium Titanate†

Abstract

The presence of magnesia in barium titanate and ita solid solutions ( e.g. with calcium zirconate or calcium stannate) greatly improves the sintering of the ceramic, the pore apace being reduced to about 1 % in some cases. At the same time the permittivity maximum is flattened and displaced to lower temperatures by about 70° c for 0-57percnt; magnesia It is shown that the magnesium probably enters the lattice at both barium and titanium sites.