On the perovskite-related materials of high dielectric permittivity with small temperature dependence and low dielectric loss

Dielectric properties of quantum paraelectric materials, SrTiO3, CaTiO3 and (La1/2Na1/2)TiO3, were presented and discussed since they show the titled dielectric properties in the lowest temperature range. In order to show our strategy to obtain the titled materials for microwave resonator applications, dielectric properties of several solid solution systems, SrTiO3-LaAlO3, Sr2TiO4-SrLaAlO4 and BaTiO3-Ba(Mg1/3Ta1/3)O3 were exemplified. Concerning about relaxor ferroelectric materials, it is pointed out that a drastic broadening of ferroelectric phase transitions in the KNbO3-BaTiO3 and BaTiO3-Ba(Fe1/2Ta1/2)O3 solid solution systems is caused by a strong local field fractuation come from the randomly oriented permanent electric dipoles produced by the heterogeneous cationic charge distribution in the solid solution.