Abstract: A CaTiO3:Pr,M fluorescent material including 100 mol % of calcium titanate CaTiO3 as a host crystal; from 0.003 mol % to 0.05 mol % of praseodymium Pr which is added, as a first additive, to the host crystal; and at least one of aluminum Al, gallium Ga, indium In, zinc Zn, magnesium Mg, sodium Na, and potassium K which is added, as a second additive M, to the host crystal.

Abstract: A phosphor including a matrix in the form of titanate expressed by Ca1-xSrxTiO3 (0<x?0.5), and Pr (praseodymium) and Li (lithium) that are added to the matrix. The phosphor may further include Zn (zinc) that is added as well as the Pr and Li to the matrix. Also disposed is a process of manufacturing the phosphor, including: a mixing step of mixing a matrix material, a first additive material including Pr, and a second additive material including Li, so as to obtain a mixture; and a firing step of firing the obtained mixture at a firing temperature of from 1050 to 1250° C.

Abstract: A phosphor including a matrix in the form of titanate expressed by Ca1-xSrxTiO3 (0<x?0.5), and Pr (praseodymium) and Li (lithium) that are added to the matrix. The phosphor may further include Zn (zinc) that is added as well as the Pr and Li to the matrix. Also disposed is a process of manufacturing the phosphor, including: a mixing step of mixing a matrix material, a first additive material including Pr, and a second additive material including Li, so as to obtain a mixture; and a firing step of firing the obtained mixture at a firing temperature of from 1050 to 1250° C.

Abstract: A CaTiO3:Pr,M fluorescent material including 100 mol % of calcium titanate CaTiO3 as a host crystal; from 0.003 mol % to 0.05 mol % of praseodymium Pr which is added, as a first additive, to the host crystal; and at least one of aluminum Al, gallium Ga, indium In, zinc Zn, magnesium Mg, sodium Na, and potassium K which is added, as a second additive M, to the host crystal.

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.