ABSTRACT The Mn-substituted NBT ceramics were prepared by the conventional ceramic fabrication technique. X-ray diffraction (XRD) studies indicated the formation of perovskite phase with rhombohedral symmetry and with small amount of second phase. It was found that 0.5mol% and 0.1mol% dopant concentration enhances piezoelectric coefficients of d33 and k33, increases the depolarization temperature Td and decreases the dielectric loss. Dielectric study showed the existence of a diffuse phase transition at Tm ≈ 320°C. It was shown that a prior electric field poling process changes the character of ϵ(T) and tanδ(T) functions, as well as shifts of Td and Tm to higher temperature. The effects are mainly caused by the reinforcement of polarization/domain ordering and by the change of content rhombohedral/tetragonal phases by electric field action. The results were discussed in terms of lattice distortion and change of defect concentration.

中文翻译：

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Mn取代Na0.5Bi0.5TiO3陶瓷在非极化和极化状态下的电性能

摘要 Mn 取代的 NBT 陶瓷是通过传统的陶瓷制造技术制备的。X 射线衍射 (XRD) 研究表明钙钛矿相的形成具有菱面体对称性和少量的第二相。发现0.5mol%和0.1mol%的掺杂浓度提高了d33和k33的压电系数，提高了去极化温度Td，降低了介电损耗。介电研究表明，在 Tm ≈ 320°C 时存在扩散相变。结果表明，先前的电场极化过程会改变 ϵ(T) 和 tanδ(T) 函数的特征，以及 Td 和 Tm 向更高温度的移动。这些影响主要是由极化/畴有序性的增强和由电场作用引起的菱形/四方相含量的变化引起的。