Effect of sintering atmosphere on ferroelectric properties of SBT ferroelectric ceramics
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The effect of sintering atmosphere on the properties of SBT ferroelectric ceramics was studied by sol-gel method and interlayerannealing process. It was found that the sintered samples in oxygen atmosphere had more a-axis-oriented grains and moregrains which are perpendicular to the plane than those in air atmosphere. The Curie temperature of the samples obtained bysintering in oxygen and air atmosphere is Tc = 273 oC and Tc = 265 oC, and the conductivating energy Ea = 0.94 eV and Ea =0.66 eV, respectively. The residual polarization intensity of the samples sintered in air atmosphere is 2Pr = 15.3 μC/cm2, thecorresponding coercive field is Ec = 51 kV/cm; the residual polarization intensity of the sample sintered in oxygen atmosphereis 2Pr = 16.6 μC/cm2, and the corresponding coercive field is about Ec = 45 kV/cm. That is because the samples sintered in theoxygen atmosphere has larger lattice distortion, lower oxygen vacancy concentration and larger a-axis oriented grains, whichare favorable for the increase of the remnant polarization and reduction of the coercive field.
Abstract
The effect of sintering atmosphere on the properties of SBT ferroelectric ceramics was studied by sol-gel method and interlayerannealing process. It was found that the sintered samples in oxygen atmosphere had more a-axis-oriented grains and moregrains which are perpendicular to the plane than those in air atmosphere. The Curie temperature of the samples obtained bysintering in oxygen and air atmosphere is Tc = 273 oC and Tc = 265 oC, and the conductivating energy Ea = 0.94 eV and Ea =0.66 eV, respectively. The residual polarization intensity of the samples sintered in air atmosphere is 2Pr = 15.3 μC/cm2, thecorresponding coercive field is Ec = 51 kV/cm; the residual polarization intensity of the sample sintered in oxygen atmosphereis 2Pr = 16.6 μC/cm2, and the corresponding coercive field is about Ec = 45 kV/cm. That is because the samples sintered in theoxygen atmosphere has larger lattice distortion, lower oxygen vacancy concentration and larger a-axis oriented grains, whichare favorable for the increase of the remnant polarization and reduction of the coercive field.
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