采用固相法获得了Mn改性的Na0.5Bi2.5Nb2O9(NBN+xmol%MnCO3, 0≤x≤10.0)铋层状压电陶瓷, 并系统地研究了Mn(掺杂)对NBN基陶瓷显微结构与电性能的影响. 结果表明, 所有获得的样品都是居里点在700℃以上的单一相铁电体. 加入Mn显著地提高了NBN系列陶瓷的机械品质因素Qm, 明显改善了陶瓷的压电与机电性能. 当MnCO3掺杂量为8.0mol%时, 陶瓷获得最佳电性能: tanδ=0.749%, d33=20 pC/N, Qm=3120, kp=12.37%, kt=21.09%, Pr=7.01 μC/cm2. NBN+xmol% MnCO3(x=8.0)陶瓷经700℃退极化处理后, 其d33保持为原来的75%(~15 pC/N), 表明该材料在高温领域下具有良好的应用前景.
Bismuth layer-structured ferroelectric ceramics Na0.5Bi2.5Nb2O9(NBN+xmol% MnCO3, 0≤x≤10.0) were synthesized by traditional solid state reaction. The effects of Mn addition on the microstructure and electrical properties of ceramics were investigated in detail. The results showed that all the ceramic samples were single-phase ferroelectrics with high Curie points (Tc≥700℃). With the addition of MnCO3, the mechanical quality factor, piezoelectric activity and electromechanical properties of Na0.5Bi2.5Nb2O9-based ceramics are enhanced significantly. Besides, the NBN+8.0mol% MnCO3 ceramic exhibits the optimum electrical properties: tanδ=0.749%, d33=20 pC/N, Qm=3120, kp=12.37%, kt=21.09%, Pr=7.01 μC/cm2. After annealing at 700℃, the d33 value of NBN+8.0mol% MnCO3 ceramic remains 75%(~15 pC/N), which indicates that this ceramic is a promising material for high temperature applications.
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