The Sb2O3-doped TiO2 varistors were obtained by conventional ceramic processing. The 0.75mol%Sb2O3 99.25 mol%TiO2 varistor has a nonlinear coefficient α = 7 and a minimum breakdown electrical field of 6 V/mm. The non...The Sb2O3-doped TiO2 varistors were obtained by conventional ceramic processing. The 0.75mol%Sb2O3 99.25 mol%TiO2 varistor has a nonlinear coefficient α = 7 and a minimum breakdown electrical field of 6 V/mm. The nonlinear electrical behaviour of TiO2.Sb2O3 ceramics was explained by the introduction of defects in the crystal lattice that are responsible for the formation of Schottky potential barriers at grain boundaries.展开更多
The nonlinear properties and the dielectric properties of a new TiO_(2)-based varistor system,TiO_(2)·Y_(2)O_(3)·Nb_(2)O_(5),have been investigated.The(Nb,Y)-doped TiO_(2)ceramics have nonlinear coefficients...The nonlinear properties and the dielectric properties of a new TiO_(2)-based varistor system,TiO_(2)·Y_(2)O_(3)·Nb_(2)O_(5),have been investigated.The(Nb,Y)-doped TiO_(2)ceramics have nonlinear coefficients of α=5-8 and a lower breakdown electrical field of 6-12V·mm^(-1),in which the varistor of(99.3mol%)TiO_(2).(0.6mol%)Y_(2)O_(3).(0.1mol%)Nb_(2)O_(5)composite sintered at 1400℃ has a nonlinear coefficient of α=7.8 and a maximum breakdown electrical field of 12 V·mm^(-1) at 1 mA·cm^(-2).Also,the relative dielectric constants of the composite reach more than 85000,which is almost unchanged within the temperature range from-20 to 280℃ and the frequency range of 0.5 K-2 MHz.Due to these properties the(Nb,Y)-doped TiO_(2)varistors has varistor capacitance bifunctional components,which are quite useful in the situation that the voltage protection and high frequency noise absorption are meanwhile required.展开更多
基金Supported by the Basis Science Talent Training Foundation of China,。
文摘The Sb2O3-doped TiO2 varistors were obtained by conventional ceramic processing. The 0.75mol%Sb2O3 99.25 mol%TiO2 varistor has a nonlinear coefficient α = 7 and a minimum breakdown electrical field of 6 V/mm. The nonlinear electrical behaviour of TiO2.Sb2O3 ceramics was explained by the introduction of defects in the crystal lattice that are responsible for the formation of Schottky potential barriers at grain boundaries.
基金Supported by the National Natural Science Foundation of China under Grant No.50072013.
文摘The nonlinear properties and the dielectric properties of a new TiO_(2)-based varistor system,TiO_(2)·Y_(2)O_(3)·Nb_(2)O_(5),have been investigated.The(Nb,Y)-doped TiO_(2)ceramics have nonlinear coefficients of α=5-8 and a lower breakdown electrical field of 6-12V·mm^(-1),in which the varistor of(99.3mol%)TiO_(2).(0.6mol%)Y_(2)O_(3).(0.1mol%)Nb_(2)O_(5)composite sintered at 1400℃ has a nonlinear coefficient of α=7.8 and a maximum breakdown electrical field of 12 V·mm^(-1) at 1 mA·cm^(-2).Also,the relative dielectric constants of the composite reach more than 85000,which is almost unchanged within the temperature range from-20 to 280℃ and the frequency range of 0.5 K-2 MHz.Due to these properties the(Nb,Y)-doped TiO_(2)varistors has varistor capacitance bifunctional components,which are quite useful in the situation that the voltage protection and high frequency noise absorption are meanwhile required.
