Patent ID: 8062775

Claim:
An article comprising: a coating disposed on a metal substrate, wherein the coating comprises an oxide, the oxide having up to about 25 atomic percent of its total cation content as tetravalent cations, with the oxide having a composition defined by the chemical formula (A x B 1-x ) 2 O 3 ; wherein A comprises Yb or Eu, and B comprises Gd, Sm, Dy, or Tb; and wherein x is in the range from about 0.01 to about 0.99; subject to the following: (a) provided that, where A consists essentially of Yb, B consists essentially of Gd; and (b) provided that, where A consists essentially of Eu and B comprises Sm, Dy, or Tb, x is in the range from about 0.5 to about 0.99.