Structural and Dielectric Properties of Nickel-Doped and Lanthanum-Chromium-Doped Barium Titanate Ceramics

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Nickel-doped BaTiO_3 (BaTi_<1-x>Ni_y O_<3-δ>: BTN) and lanthanum-chromium double-doped BaTiO_3 (BaTi_<1-x>Ni_y O_<3-δ>: BLTC) ceramtcs were synthesized and their symmetry and dielectric properties were studied. Samples were sintered at 1400℃ in air from stoichiometric amounts of BaCO_3 and other metal oxides. X-ray diffraction data were obtained at 20℃. Dielectric properties were measured in the temperature range of 78 K to 453 K. With the increase of dopant ratio y, Curie temperature T_c of BTN decreases, but when y exceeds about 0.01, a hexagonal phase appears and the dielectric constant becomes smaller. On the other hand, in the entire range of x, BLIC shows a perovskite stmcture and the compounds with larger x exhibit conductive rhombohedral or orthorhombic phases. In the range of x smaller than 0.1, BLTC shows a diffuse phase transition and a high dielectric constant with small tan I. The relaxor-like frequency dispersion was observed in BLIC at low temperatures.
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2002-11-30