Patent ID: 8178456

Claim:
A sintered dielectric ceramic formed from a batch powder comprising: a titanate comprising at least one of CaTiO 3 , SrTiO 3 , or Ca x Sr 1-x TiO 3 where x=0 to 1, wherein the titanate is non-ferroelectric and is substantially free of MgTiO 3 ; a sintering aid in an amount greater than 0 wt. % up to about 20 wt. %, comprising boron oxide and at least one of zinc oxide, barium oxide, aluminum oxide, lithium oxide, copper oxide, silicon oxide, calcium oxide, strontium oxide, potassium oxide, lithium fluoride, zinc fluoride, or barium fluoride, or combinations thereof, wherein the sintering aid is adapted to facilitate sintering at temperatures of about 1050° C. or less; and an acceptor additive in the form of an oxide or oxide precursor and comprising at least one cation of manganese, magnesium, chromium, iron, cobalt, gallium, aluminum, or lithium, or combinations thereof and being present in an amount of between about 0.01 wt. % and about 0.1 wt. %, the cation of the acceptor additive substituting for titanium in the at least one of CaTiO 3 , SrTiO 3 , or Ca x Sr 1-x TiO 3 to suppress electrical conductivity in the sintered dielectric ceramic; wherein the titanate forms the balance of the ceramic; and wherein the sintered dielectric ceramic is substantially free of bismuth, lead, and cadmium.