Search for unusual magnetic, electric and dielectric phenomena with contributions of s-electrons

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6s electrons of Bi greatly act on the crystallographic structure and the banded structure of a compound, and affect the electrical property. We searched for unusual magnetic, electrical and the dielectric properties in the perovskite compound where such Bi ion was arranged on A-site. Several peculiar phenomena such as absence of the long-range magnetic order in Bi_3Mn_4O_<12>(NO_3), an insulator to metal transition accompanied with a negative thermal expansion in Bi_<0.95>La_<0.05>NiO_3 and the enhancement of the piezoelectric property in BiFe_<1-x>Co_xO_3 were found.