Lead-free 0.955K_0.5Na_0.5NbO₃-0.045Bi_0.5Na_0.5ZrO₃ + 0.6%MnO (KNN-0.045BNZ + Mn0.6) ceramics have been prepared by a conventional solid-state sintering method in air. All the samples sintered at different temperatures possess a coexisting phase boundary (CPB) between rhombohedral (R) phase and tetragonal (T) phase. The increase of sintering temperature (T_s) increases the phase fraction of T phase in CPB region. Mn²⁺, Mn³⁺ and Mn⁴⁺ ions coexist in all the KNN-0.045BNZ + Mn0.6 ceramics sintered at 1110 °C to 1190 °C. High sintering temperature can induce a transformation from ${\mathrm{M}\mathrm{n}}_{\mathrm{N}\mathrm{b}}^{\text{'}\text{'}}$ defects to ${\mathrm{M}\mathrm{n}}_{\mathrm{N}\mathrm{b}}^{\text{'}}$ defects. The samples with fine grain show stable octahedral structure. The KNN-0.045BNZ + Mn0.6 ceramics with fine grain possess excellent temperature stability of $d_{33}^{*}$ due to the wide phase transition region. The increase of sintering temperature induces the (R-T) phase transition temperature to move to room temperature.

无铅0.955K _0.5 Na _0.5 NbO ₃ -0.045Bi _0.5 Na _0.5 ZrO ₃  + 0.6％MnO（KNN-0.045BNZ + Mn0.6）陶瓷已通过常规的固态烧结方法在空气中制备。在不同温度下烧结的所有样品在菱形（R）相和四方（T）相之间都存在共存的相界（CPB）。烧结温度（T _s）的增加增加了CPB区域中T相的相分数。Mn 2 ⁺，Mn ³⁺和Mn ⁴⁺离子共存于1110°C至1190°C烧结的所有KNN-0.045BNZ + Mn0.6陶瓷中。较高的烧结温度会引起${\mathrm{中号}\mathrm{ñ}}_{\mathrm{ñ}\mathrm{b}}^{\text{'}\text{'}}$ 缺陷 ${\mathrm{中号}\mathrm{ñ}}_{\mathrm{ñ}\mathrm{b}}^{\text{'}}$缺陷。具有细晶粒的样品显示出稳定的八面体结构。具有细晶粒的KNN-0.045BNZ + Mn0.6陶瓷具有出色的温度稳定性$d_{33}^{*}$由于相变区域较宽。烧结温度的升高引起（RT）相变温度移至室温。