Piezoelectric composite material
First Claim
1. A ferroelectric, pyroelectric or piezoelectric composite material comprising a mixture of one or more polymers and a ferroelectric ceramic powder which contains 90% or more grains in a particle size range of about 1 μ
- m to about 3 mm at a ceramic powder;
polymer(s) mixing ratio of about 1;
9 to 9;
1 by volume, said ferroelectric ceramic powder comprising microcrystals having virtually single domains and being prepared by mixing starting powders in amounts corresponding to the desired chemical composition of the ferroelectric ceramic powder, subjecting the mixed powders to a solid phase reaction, mechanically grinding the reaction product into powder, whereby multiple domains or distorted phases are formed, and then heat annealing the ground powder at a temperature sufficient to reform the multiple domains or distorted phases to virtually single domains.
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Abstract
A piezoelectric composite material having excellent piezoelectric property and workability, which is prepared by compounding in a specific mixing ratio a ferroelectric ceramic powder comprising microcrystals having uniform size and virtually a single domain and a polymer. The ceramic powder is obtained by preparing a ceramic having a desired composition by causing the appropriate mixture of starting powders to undergo a solid phase reaction, grinding the reaction product, annealing the resulting powder under heat and optionally chemically etching it.
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Citations
22 Claims
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1. A ferroelectric, pyroelectric or piezoelectric composite material comprising a mixture of one or more polymers and a ferroelectric ceramic powder which contains 90% or more grains in a particle size range of about 1 μ
- m to about 3 mm at a ceramic powder;
polymer(s) mixing ratio of about 1;
9 to 9;
1 by volume, said ferroelectric ceramic powder comprising microcrystals having virtually single domains and being prepared by mixing starting powders in amounts corresponding to the desired chemical composition of the ferroelectric ceramic powder, subjecting the mixed powders to a solid phase reaction, mechanically grinding the reaction product into powder, whereby multiple domains or distorted phases are formed, and then heat annealing the ground powder at a temperature sufficient to reform the multiple domains or distorted phases to virtually single domains. - View Dependent Claims (2, 3, 4, 5)
- m to about 3 mm at a ceramic powder;
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6. A ferroelectric, pyroelectric or piezoelectric composite material comprising a mixture of one or more polymers and a ferroelectric ceramic powder which contains 90% or more grains in a particle size range of about 1 μ
- m to about 3 mm at a ceramic powder;
polymer(s) mixing ratio of about 1;
9 to 9;
1 by volume, said ferroelectric ceramic powder comprising microcrystals having virtually single domains and being prepared by mixing starting powders in amounts corresponding to the desired chemical composition of the ferroelectric ceramic powder, subjecting the mixed starting powders to a solid phase reaction, mechanically grinding the reaction product into powder, whereby multiple domains or distorted phases are formed, then heat annealing the ground powder at a temperature sufficient to reform the multiple domains or distorted phases to virtually single domains, and further subjecting the annealed powder to chemical etching in an etching solution under mild conditions such that the distorted phases and amorphous phases present are removed. - View Dependent Claims (7, 8, 9, 10, 11, 12)
- m to about 3 mm at a ceramic powder;
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13. A ferroelectric, pyroelectric or piezoelectric composite material comprising a mixture of one or more polymers and ferroelectric single crystal powder which contains 90% or more grains in a particle size range of about 1 μ
- m to about 3 mm at a single crystal powder;
polymer(s) mixing ratio of about 1;
9 to 9;
1 by volume, said ferroelectric single crystal powder comprising microcrystals having virtually single domains and being prepared by grinding a single crystal until the resulting powder has the desired particle size, whereby multiple domains or distorted phases are formed, and heat annealing the thus ground powder at a temperature sufficient to reform the multiple doamins or distorted phases to virtually single domains. - View Dependent Claims (14, 15, 16)
- m to about 3 mm at a single crystal powder;
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17. A ferroelectric, pyroelectric or piezoelectric composite material comprising a mixture of one or more polymers and a ferroelectric single crystal powder which contains 90% or more grains in a particle size range of about 1 μ
- m to about 3 mm at a single crystal powder;
polymer(s) mixing ratio of about 1;
9 to 9;
1 by volume, said ferroelectric single crystal powder comprising microcrystals having virtually single domains and being prepared by grinding a single crystal until the resulting powder has the desired particle size, whereby multiple domains or distorted phases are formed, heat annealing the thus ground powder at a temperature sufficient to reform the multiple domains or distorted phases to virtually single domains and further subjecting the annealed powder to chemical etching in an etching solution under mild conditions such that the distorted phases and amorphous phases present are removed. - View Dependent Claims (18, 19, 20, 21, 22)
- m to about 3 mm at a single crystal powder;
Specification