期刊
SCIENCE OF SINTERING
卷 42, 期 1, 页码 69-79出版社
INT INST SCIENCE SINTERING (I I S S)
DOI: 10.2298/SOS1001069P
关键词
BaTiO3 doped ceramics; Sintering; Microstructures; Dielectric properties
资金
- Investigation of the relation in triad: synthesis-structure-properties for functional materials [142011G]
- Serbian Ministry for Science and Technological Development
A series of La/Mn, Sm/Mn and Dy/Mn codoped BaTiO3 samples were prepared by the conventional solid state procedure with dopant concentrations ranging from 0.1 up to 2.0 at%. The specimens were sintered at 1320 degrees C and 1350 degrees C in an air atmosphere for two hours. The low doped samples demonstrated a mainly uniform and homogeneous microstructure with average grain sizes ranging from 0.3 mu m to 5.0 mu m. The appearance of secondary abnormal grains in the fine grain matrix and core-shell structure were observed in highly doped La/BaTiO3 and Dy/BaTiO3 sintered at 1350 degrees C. The low doped samples, sintered at 1350 degrees C, display a high value of dielectric permittivity at room temperature, 6800 for Sm/BaTiO3, 5900 for Dy/BaTiO3 and 3100 for La/BaTiO3. A nearly flat permittivity-response was obtained in specimens with 2.0 at% additive content. Using a modified Curie-Weiss law the Curie-like constant C' and a critical exponent gamma were calculated. The obtained values of gamma pointed out the diffuse phase transformation in heavily doped BaTiO3 samples.
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