Abstract: There is provided a piezoelectric ceramics, including a perovskite compound of a non-stoichiometric composition represented by a composition formula (KxNa1-x)y(Nb1-zTaz)O3 (0<x?1, 0<y<1, 0?z?0.5); and a sintering aid which includes an oxide containing K, Co, and Ta.

Abstract: There is provided a piezoelectric ceramics, including a perovskite compound of a non-stoichiometric composition represented by a composition formula (KxNa1-x)y(Nb1-zTaz)O3 (0<x<1?1, 0<y<1, 0?z?0.5); and a sintering aid which includes an oxide containing K, Co, and Ta.

Abstract: A lead-free piezoelectric ceramic composition wherein a suitable amount of Cu is contained in a perovskite compound of a non-stoichiometric composition represented by a formula (KxA1-x)y(Nb1-zBz)O3, wherein “A” represents at least one of Na and Bi, while “B” represents at least one of Ta and Ti, and wherein 0<x?1, 0<y<1, and 0?z?1, so that by-products such as KaCubNbcOd and KaCubTacOd are produced as a result of reaction of (Nb1-zBz) with Cu in the process of calcination of a starting material, and the by-products restrict melting and abnormal grain growth of (KxNa1-x)(Nb1-zTaz) O3 during firing of a calcined body, thereby improving sinterability of the fired body, while restricting volatilization of alkali components and melting of KNbO3, thereby increasing the density and improving the piezoelectric properties of the fired body.

Abstract: A lead-free piezoelectric ceramic composition wherein a suitable amount of Cu is contained in a perovskite compound of a non-stoichiometric composition represented by a formula (KxA1−x)y(Nb1−zBz)O3, wherein “A” represents at least one of Na and Bi, while “B” represents at least one of Ta and Ti, and wherein 0<x≦1, 0<y<1, and 0≦z≦1, so that by-products such as KaCubNbcOd and KaCubTacOd are produced as a result of reaction of (Nb1−zBz) with Cu in the process of calcination of a starting material, and the by-products restrict melting and abnormal grain growth of (KxNa1-x)(Nb1−zTaz) O3 during firing of a calcined body, thereby improving sinterability of the fired body, while restricting volatilization of alkali components and melting of KNbO3, thereby increasing the density and improving the piezoelectric properties of the fired body.

Abstract: The present invention provides a ceramic film with a variety of structures having one-dimensional through channels which can be utilized favorably in the separation of molecules or microparticles or as a support film for a catalyst with a large surface area or for a catalyst of high activity, and also provides a method for manufacturing this film efficiently and with good reproducibility, and the present invention relates to a ceramic film having one-dimensional through channels, which is a porous ceramic film having nanometer-size pores that go through one-dimensionally from one surface of the film to the other surface, characterized in that the porous ceramic film is formed on a substrate of glass, ceramic, or a heat-resistant metal; and relates to a method for manufacturing the above-mentioned ceramic film.