Patent ID: 7309530

Claim:
A composition comprising: a ceramic matrix including an at least partially stabilized zirconia, wherein the at least partially stabilized zirconia includes an yttria first dopant; a pentavalent oxide second dopant in a concentration of about 0.8 mol percent, wherein the pentavalent second dopant includes one selected from niobia (Nb 2 O 5 ) and niobium oxide as a non-stoichiometric solid solution, in a major amount and at least one other pentavalent oxide of tantala; and an oxide third dopant in a concentration of about 0.6 mol percent neodymia, and wherein the pentavalent oxide second dopant is in a ratio to the oxide third dopant of less than or equal to about 1, and wherein the composition exhibits a thermal conductivity of about 1.6 W/(m K) after being heated to about 1,200° C. for about 2 hours.