【摘要】 采用固相法制备了(Bi_0.5Na_0.5)_0.94Ba_0.06Ti_1-x(Yb_0.5Nb_0.5)_xO₃（BNBT-xYN,x=0.01、0.02、0.03、0.04、0.05、0.07）无铅陶瓷,系统研究了(Yb_0.5Nb_0.5)⁴⁺掺杂量对陶瓷相结构,表面微观结构,铁电、储能、应变及阻抗性能的影响。研究结果表明:(Yb_0.5Nb_0.5)⁴⁺均固溶进入BNBT陶瓷基体中,形成单一的钙钛矿结构。BNBT-xYN陶瓷具有致密的结构,类球形的晶粒随着(Yb_0.5Nb_0.5)⁴⁺掺杂量增加而明显细化。陶瓷由铁电体向弛豫铁电体转变,当x=0.02时可观察到类反铁电体的双电滞回线。掺杂使得陶瓷的储能密度和储能效率均得到提高,当x=0.03时陶瓷的储能密度和储能效率在70 kV/cm下分别达到0.62 J/cm³、50.16%;当x=0.02时BNBT-xYN陶瓷伴随着大的应变,应变量最大可达0.346%。(Yb_0.5Nb_0.5)⁴⁺的掺杂降低了陶瓷的铁电性,使其向弛豫铁电体转变,转变温度降低到室温以下,同时陶瓷有很好的绝缘性。更多还原

【Abstract】 Lead-free(Bi_0.5Na_0.5)_0.94Ba_0.06Ti_1-x(Yb_0.5Nb_0.5)_xO₃ ceramics（x=0.01, 0.02, 0.03, 0.04, 0.05, 0.07） were prepared by solid phase method. The influences of(Yb_0.5Nb_0.5)⁴⁺ doping amount on the phase structure, surface microstructure, ferroelectric, energy storage, strain and impedance properties were studied systematically. The results show that all(Yb_0.5Nb_0.5)⁴⁺ complex ions dissolve into BNBT ceramic matrix and form perovskite structure. BNBT-xYN ceramics have compact structure, and the spheroid-like grains are obviously refined with the increase of(Yb_0.5Nb_0.5)⁴⁺ doping content. The phase transition from ferroelectrics to relaxation ferroelectrics is observed at x=0.02. Complex ions doping improves the energy storage density and energy storage efficiency of BNBT-xYN ceramics. When doping amount is 0.03, the energy storage density and energy storage efficiency reach 0.62 J/cm³ and 50.16% respectively at 70 kV/cm. At doping content of 0.02, BNBT-xYN ceramics illustrate large strain of up to 0.346%.(Yb_0.5Nb_0.5)⁴⁺ doping reduces the ferroelectric properties of BNBT-xYN ceramics and makes it transform into relaxed ferroelectric. The phase transition temperature drops below room temperature. The BNBT-xYN ceramics have good insulation.更多还原