The invention disclosed relates to novel materials of the general formula
(Sr.sub.1-1.5xM1.sub.x).sub.1-y/2Ti.sub.1-yM2.sub.yO.sub.3 [I] wherein
M1 is a first trivalent dopant metal atom replacing some of the strontium
atoms on a strontium sub-lattice, x is a mole percent of said dopant
atoms M1 on the strontium sublattice and 0