Production methods of dielectric layer and dielectric element, dielectric element, and piezoelectric transformer

A method of producing a dielectric element comprising a dielectric layer comprising a polycrystalline dielectric material having anisotropy in the coefficient of thermal expansion and electrodes formed in parallel with a surface of the dielectric layer and disposed on the surface and/or in the interior of the dielectric layer, wherein:

• the method includes a compact forming process of producing a laminar compact from the aggregate of oriented raw material particles which are raw material particles having a crystal lattice oriented in a prescribed direction and a shape the longitudinal direction of which forms a prescribed angle with the prescribed direction, and an incinerating process of producing the dielectric layer by incinerating the compact;
• and
• the compact forming process includes a process of applying shearing force to the aggregate.

A dielectric element having a first electrode and a second electrode formed in parallel with a surface of a dielectric layer, wherein the dielectric layer comprises a polycrystalline dielectric material having a difference in the coefficient of thermal expansion between the a axis direction and the c axis direction of the crystal lattice.

A piezoelectric transformer having a dielectric layer, a first electrode and a second electrode aligned in the direction of the thickness of the dielectric layer and disposed in parallel with each other, and a third electrode to output voltage generated between the third electrode and the second electrode due to a piezoelectric effect caused by stress generated in the dielectric layer when input voltage is applied between the first electrode and the second electrode, wherein the dielectric layer comprises a polycrystalline dielectric material having a difference in the coefficient of thermal expansion between the a axis direction and the c axis direction of the crystal lattice.