Patent ID: 7711022

Claim:
An article comprising: an oxide having a polycrystalline structure and comprising type A lattice sites and type B lattice sites, the oxide having a formula of ABO 3 , wherein A represents material occupying the type A lattice sites and B represents material occupying the type B lattice sites; wherein A comprises a plurality of elements, the plurality of elements comprising lutetium, wherein the lutetium is present in an amount of at least about 0.5 mole fraction of the oxide yttrium, wherein the yttrium is present in an amount in the range from about 0.0025 mole fraction to about 0.5 mole fraction; and a rare earth element, wherein the rare earth element is present in an amount in the range from about 0.0025 mole fraction to about 0.5 mole fraction; and wherein B comprises aluminum.