Rising Tc in Bi and Cu co-doped BaTiO_3

摘要

The solid solution (Ba_(1-2x)Bi_(2x))(Cu_xTi_(1-x))O_3 (0.00.040 a small amount of an unknown impurity phase appeared in addition to a tetragonal perovskite-type phase. The Curie temperature Tc increased to 140 ℃ at x = 0.010. Rising Tc was confirmed by temperature dependence of the dielectric constants and the endothermic peaks observed in DTA curves. This is the first example for rising Tc in the solid solution based on BaTiO_3 except for doping of Pb~(2+) ion.