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US 11,179,682 B2Granted
Segregation resistant perovskite oxides with surface modification
AssigneeMassachusetts Institute of Technology
InventorsBilge Yildiz, Nikolai Tsvetkov, Qiyang Lu
Life of this patent
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Abstract
A method and a composition to stabilize the surface cation chemistry of the perovskite or related oxides, and thus, to minimize or completely avoid the detrimental segregation and phase separation of dopant cations at the surface can include modifying the surface with more oxidizable metal cations and/or more oxidizable metal oxides, thereby reducing the oxygen vacancy concentration at the very surface.
Claims25
A composition comprising:
- a base layer including a material of formula (I), (II) or (III), wherein the formula (I), (II) and (III) are:
- AxA′1−xByB′1−yO3±δ (I)
- (AxA′1−x)2(ByB′1−y)2O5 (II)
- (AxA′1−x)n+1(ByB′1−y)nO3n+1 (III)
- wherein each of A and A′, independently, is a rare earth metal or an alkaline earth metal, x is in the range of 0 to 1, each of B and B′, independently, is a transition metal, y is in the range of 0 to 1, δ is in the range of 0 to 1, and n is a number of layers;
- and
- a surface layer including a metal, a metal cation or an oxide of one or more metal elements, or a combination thereof,
- wherein the cation and the oxide of one or more metal element are more oxidizable, or more difficult to reduce, than the material of the formula (I, II, or III),
- wherein the material includes a perovskite oxide, brownmillerite or a Ruddlesden Popper and a deposited element that is dissolved into the base layer lattice at or near the surface.
6 more elements
A composition comprising:
- a layer including a material of formula (I)), (II) or (III), wherein the formula (I), (II) and (III) are:
- AxA′1−xByB′1−yO3±δ (I)
- (AxA′1−x)2(ByB′1−y)2O5 (II)
- (AxA′1−x)n+1(ByB′1−y)nO3n+1 (III)
- wherein each of A and A′, independently, is a rare earth metal or an alkaline earth metal, x is in the range of 0 to 1, each of B and B′, independently, is a transition metal, y is in the range of 0 to 1, δ is in the range of 0 to 1, and n is a number of layers;
- wherein a surface of the layer includes a metal, a metal cation or an oxide of one or more metal elements, or a combination thereof, wherein the material includes a perovskite or a brownmillerite or a Ruddlesden Popper, wherein the material further includes a deposited element that is dissolved into the layer lattice at or near the surface.
3 more elements
Dependencies are inferred from the claim text.