EFFECT OF ANTIMONY DOPING ON PROPERTIES OF BARIUM TITANATE CERAMICS

Nanopowders of pure and antimony doped barium titanate were synthesized by polymeric precursors method. Sintering was performed at 1300 oC for 8 h. XRD analysis showed formation of cubic crystal structure in all nanopowders and tetragonal in ceramics. The influence of antimony concentration on structure change and microstructure development was analyzed. The significant dielectric properties modification as a consequence of antimony doping was noticed. The electrical resistivity measurements pointed out that antimony concentration influenced on materials change from insulator to semiconductor

Broadband dielectric and Mössbauer studies of BaTiO3–NiFe2O4 composite multiferroics

A broadband dielectric investigation and Mossbauer studies were performed on 0.7BaTiO(3)-0.3NiFe(2)O(4) composite ceramics prepared from chemically obtained barium titanate and nickel ferrite powders. Dielectric spectroscopy revealed a Debye-type relaxation at frequencies between 10 GHz and 1 THz. The relaxation time slows down on cooling according to the Arrhenius law which can be attributed to the transformation of the system from the paraelectric to the ferroelectric phase through an intermediate relaxor state. The temperature dependence of the center shift of the Mossbauer spectrum was analyzed by applying Debye and Einstein models. Its deviation from these models can be attributed to the anharmonicity. It is also possible that the center shift is affected by the Fe atoms incorporated in BaTiO3 lattice or at the interfaces between BaTiO3 and NiFe2O4