Anisotropically shaped SrTiO3 single crystal particles
AssigneeThe Penn State Research Foundation
InventorsGary L. Messing, Susan Trolier-McKinstry, Koji Watari
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Abstract
The disclosed invention relates to unsupported, anisotropically shaped, cubic SrTiO3 single crystal particles and their method of manufacture. The particles have a rectangular face and measure about 10-40 micron in edge length, and about 2-5 micron in thickness. The anisotropically shaped, cubic SrTiO3 single crystal particles are made by reacting tabular Sr3Ti2O7 with TiO2 in the presence of a molten alkali salt.
Claims21
An unsupported, anisotropically shaped, cubic SrTiO3 single crystal particle.
A method of manufacture of unsupported, anisotropically shaped SrTiO3 particles comprising,
- reacting SrCO3 and TiO7 in a first molten alkali metal salt to produce tabular SrTi2O7 particles,
- reacting the tabular Sr3Ti2O7 particles with TiO3 in the presence of a second molten alkali metal salt to produce a fired product that includes anisotropically shaped, single crystal SrTiO3.
- cooling the fired product to a temperature below the melting point of the second alkali metal salt, and
- treating the fired product with water to remove the second alkali metal salt to yield unsupported, anisotropically shaped, single crystal SrTiO3 particles.
A method of manufacture of oriented, cubic (Bi0.5Na0.5)TiO3 grains comprising,
- forming a slurry of Na2CO3, Bi2O3, BaCO3, and TiO2 in a polar alcohol solvent,
- drying the slurry to produce a dried powder
- firing the dried powder at 800° C.,
- mixing the dried powder with a binder, anisotropically shaped, single crystal SrTiO3 platelets, and an organic solvent to form a second slurry
- casting the second slurry onto a substrate to produce a tape,
- drying the tape to produce a dried tape, and
- firing the dried tape to produce oriented, cubic (Bi0.5Na0.5)TiO3.
A method of manufacture of textured BaTiO3 comprising,
- forming a mixture of BaTiO3 powder and acid,
- washing the BaTiO3 powder,
- drying the BaTiO3 powder,
- forming a slurry of the dried BaTiO3 powder, organic solvent polymeric binder and anisotropically shaped, single crystal SrTiO3 platelets to produce a SrTiO3/BaTiO3 slurry,
- forming a tape of the SrTiO3/BaTiO3 slurry,
- heating the tape to remove the polymeric binder, and sintering the tape.
Dependencies are inferred from the claim text.