Piezoelectric/electrostrictive material and process for production thereof
AssigneeNGK Insulators, Ltd.
InventorsHirofumi Yamaguchi, Takaaki Koizumi
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Abstract
A piezoelectric/electrostrictive material is made of a BaTiO3-based porcelain composed mainly of BaTiO3, and a strain (S4000) of transversal direction is 650×10−6 or more in an electric field of 4,000 V/mm. This porcelain has a Curie temperature of 110 to 130° C., and its crystal phase at ambient temperature consists essentially of tetragonal and cubic phases. The piezoelectric/electrostrictive material being composed of this porcelain is superior in strain to conventional products, and can be suitably used in an actuator or a sensor.
Claims10
A piezoelectric/electrostrictive material made of a BaTiO3-based porcelain composed mainly of BaTiO3 and containing CuO and Nb2O5, characterized in that a strain (S4000) of transversal direction is 650×10−6 or more, in an electric field of 4,000 V/mm.
A piezoelectric/electrostrictive material made of a BaTiO3-based porcelain composed mainly of BaTiO3 and containing CuO and Nb2O5, characterized in that it has a Curie temperature of 110 to 130° C.
A piezoelectric/electrostrictive material made of a BaTiO3-based porcelain composed mainly of BaTiO3 and containing CuO and Nb2O5, characterized in that crystal phase of the porcelain at ambient temperature consists essentially of tetragonal phase and cubic phase.
A process for producing a piezoelectric/electrostrictive material made of a BaTiO3-based porcelain composed mainly of BaTiO3 and containing CuO and Nb2O5, characterized by weighing individual raw materials so as to give a predetermined composition, mixing and grinding them, calcinating the resulting mixed powder in the air at 850 to 950° C., then grinding the resulting calcinated material until the ground material comes to have a specific surface area of 7 m2/g or less, and molding and firing the ground material.
Dependencies are inferred from the claim text.