Ferroelectric fluoride compositions and methods of making and using same
AssigneeUniversity of Houston System
InventorsP. Shiv Halasyamani, Hong-Young Chang
Life of this patent
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Abstract
A method for synthesis of a ferroelectric material characterized by the general formula AxByFz where A is an alkaline earth metal, B is transition metal or a main group metal, x and y each range from about 1 to about 5, and z ranges from about 1 to about 20 comprising contacting an alkaline earth metal fluoride, a difluorometal compound and a fluoroorganic acid in a medium to form a reaction mixture; and subjecting the reaction mixture to conditions suitable for hydrothermal crystal growth.
Claims24
A method for synthesis of a ferroelectric material characterized by the general formula AxByFz where A is an alkaline earth metal, B is transition metal or a main group metal, x and y each range from about 1 to about 5, and z ranges from about 1 to about 20 comprising:
- contacting an alkaline earth metal fluoride, a difluorometal compound and a fluoroorganic acid in a medium to form a reaction mixture;
- and
- subjecting the reaction mixture to conditions suitable for hydrothermal crystal growth comprising a temperature of from about 150° C. to about 250° C. and a pressure of from about 5 atm to about 75 atm.
A method for synthesis of a ferroelectric material characterized by the general formula AXByFz where A is an alkaline earth metal, B is transition metal or a main group metal, x and y each range from about 1 to about 5, and z ranges from about 1 to about 20 comprising:
- contacting an alkaline earth metal fluoride, a difluorometal compound and a fluoroorganic acid in a medium to form a reaction mixture;
- and
- subjecting the reaction mixture to conditions suitable for hydrothermal crystal growth wherein the ferroelectric material has a piezoelectric charge constant of from about 5 pC/N to about 200 pC/N and the hydrothermal reaction being carried out at a temperature of 150-250° C. and a pressure of 5 atm to 75 atm.
Dependencies are inferred from the claim text.