Thin film heterostructures
AssigneeIndian Institute of Technology Kanpur
InventorsAshish GARG, Rajesh KATOCH, Rajeev GUPTA
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Abstract
Bismuth ferrite-lead titanate heterostructures and methods for their preparation are disclosed. Heterostructures may include a metal coated substrate contacting a first ferroelectric layer made of lead titanate; and a second ferroelectric layer contacting the first ferroelectric layer, the second ferroelectric layer having the composition (BiFeO3)1-x—(PbTiO3)x, wherein 0.25≦x≦0.35.
Claims34
A method of making a heterostructure, the method comprising:
- mixing a solution of a bismuth salt with a solution of a ferric acetylacetonate to obtain a bismuth ferrite solution;
- mixing a solution of a lead salt with a solution of a titanium compound to obtain a lead titanate solution;
- mixing the bismuth ferrite solution and the lead titanate solution to obtain bismuth ferrite-lead titanate solution (BF-PT solution);
- contacting a substrate with the lead titanate solution to obtain a lead titanate coated substrate;
- and
- contacting the lead titanate coated substrate with the BF-PT solution to obtain the hetero structure.
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21-22. (canceled)
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27-31. (canceled)
The method of claim 31, wherein contacting the lead titanate coated substrate with the BF-PT solution results in the heterostructure comprising a BF-PT coating having a composition (BiFeO3)1-x—(PbTiO3)x, wherein 0.25≦x≦0.35.
A heterostructure comprising:
- a metal coated silicon substrate;
- a first ferroelectric layer comprising lead titanate, wherein the first ferroelectric layer is in contact with the metal coated silicon substrate;
- and
- a second ferroelectric layer comprising (BiFeO3)1-x—(PbTiO3)x, wherein 0.25≦x≦0.35, wherein the second ferroelectric layer is in contact with the first ferroelectric layer, and wherein the thickness of the first ferroelectric layer is 30 nanometers, and the heterostructure has a dielectric constant of about 400 to about 1000 when measured at a temperature of about 20° C. to about 30° C.
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Dependencies are inferred from the claim text.