【摘要】 采用传统陶瓷常压烧结工艺制备(0.996–x)KNN-0.004BM-xLS(x=0、0.01、0.02、0.03、0.04、0.05、0.06)无铅压电陶瓷,着重研究了LS的含量对(0.996–x)KNN-0.004BM-xLS陶瓷相结构和压电性能的影响。结果表明,当x≤0.02时,陶瓷具有单一的正交相结构;当0.03≤x≤0.05时,陶瓷具有正交相与四方相共存的过渡结构;当x=0.06时,陶瓷具有单一的四方相结构。陶瓷的MPB成分范围在0.03≤x≤0.05。随着LS含量的增加,陶瓷材料的d33和kp均先增加后减小,当x=0.05时,均达到最大值,分别为230 pC/N和0.42;陶瓷的To-t和Tc均向低温方向移动;当x=0时,陶瓷的To-t和Tc分别为455和215℃;当x=0.02时,陶瓷的To-t和Tc分别为385和150℃;当x=0.06时,To-t和Tc分别降至370℃和75℃。更多还原

【Abstract】 Lead-free(0.996–x)KNN-0.004BM-xLS(x=0,0.01,0.02,0.03,0.04,0.05,0.06) ceramics were prepared by the traditional ceramic sintering processing.The effect of LS content on the microstructure and piezoelectric properties of KNN-BM lead-free ceramics was investigated.The results show that the ceramics have a single orthorhombic phase structure when x≤0.02,a co-existed phases orthorhombic and tetragonal phases structure at 0.03 ≤x≤0.05,and a single tetragonal phase structure at x=0.06.The morphotropic phase boundary(MPB) for the ceramics is identified in the composition range of 0.03≤x≤0.05.With increasing the LS content,both d33 and kp of the ceramics firstly increase and then decrease.At x=0.05,d33 and kp reach their maximum values which are 230 pC/N and 0.42,respectively.The To-t and Tc of the ceramics shift to the low temperature with the increasing of the LS content.The To-t and Tc of the ceramics are 455 and 215℃ at x=0,385 and 150℃ at x=0.02,370 and 75℃ at x=0.06,respectively.更多还原