Effects of the Co_(3)O_(4)nanoparticle on the phase formation,microstructure and dielectric properties of barium titanate ceramics are investigated in this study.Co_(3)O_(4)-doped BaTiO_(3)ceramics were prepared by th...Effects of the Co_(3)O_(4)nanoparticle on the phase formation,microstructure and dielectric properties of barium titanate ceramics are investigated in this study.Co_(3)O_(4)-doped BaTiO_(3)ceramics were prepared by the conventional mixed oxide method followed by normal sintering in air.Systematic studies of X-ray diffraction(XRD),scanning electron microscopy and dielectric spectroscopy with varying doping levels were performed.The cell parameters,tetragonality and crystallite size of doped ceramics also were calculated from XRD data.Results showed that the single phase of BaTiO_(3)gave no evidence of unwanted peak forms in any of the samples.Cubic phase occurred after adding Co_(3)O_(4)at 0.25 mol%.Various grain sizes and shapes were found in this system.Finally,adding Co_(3)O_(4)in BaTiO_(3)ceramics resulted in shifting of the Curie point to a lower temperature.The composition,x=0.25,showed different dielectric behavior,which related to appearance of the cubic phase and¯ne grain microstructure.展开更多
文摘Effects of the Co_(3)O_(4)nanoparticle on the phase formation,microstructure and dielectric properties of barium titanate ceramics are investigated in this study.Co_(3)O_(4)-doped BaTiO_(3)ceramics were prepared by the conventional mixed oxide method followed by normal sintering in air.Systematic studies of X-ray diffraction(XRD),scanning electron microscopy and dielectric spectroscopy with varying doping levels were performed.The cell parameters,tetragonality and crystallite size of doped ceramics also were calculated from XRD data.Results showed that the single phase of BaTiO_(3)gave no evidence of unwanted peak forms in any of the samples.Cubic phase occurred after adding Co_(3)O_(4)at 0.25 mol%.Various grain sizes and shapes were found in this system.Finally,adding Co_(3)O_(4)in BaTiO_(3)ceramics resulted in shifting of the Curie point to a lower temperature.The composition,x=0.25,showed different dielectric behavior,which related to appearance of the cubic phase and¯ne grain microstructure.
