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中文摘要：
用传统固相法制备（K0.48-xNa0.52）（Nb0.93-xSb0.07）O3-xLiTaO3体系无铅压电陶瓷，X射线衍射物相分析结果表明：该体系陶瓷正交一四方转变的准同型相界位于0．035〈x〈0．04，在室温具有较高的压电性能。用传统烧结方法很难得到致密的压电陶瓷，用两步烧结工艺可以得到致密化且晶粒尺寸均一的陶瓷，因此重点研究采用两步烧结技术对x=0．0375的陶瓷进行烧结工艺的改进和优化，研究微观组织结构与陶瓷压电性能之间的关系。最佳两步烧结工艺为：θ1=1120℃，t1=10min，05=1000℃，t2=5h。制备陶瓷的电学性能如下：压电常数d33=261pC／N，机械品质因数Qm=29，相对介电常数ετ=1659，平面机电耦合系数kp=0．47。
英文摘要：
Multi-component alkaline niobate （K0.48-xNa0.52）（Nb0.93-xSb0.07）O3-xLiTaO3lead-free piezoelectric ceramics were success- fully prepared by conventional solid-state method. Experimental results from X-ray diffraction patterns indicate that the existence of an orthorhombic-tetragonal morphotropie phase boundary at the composition of 0.035〈x〈0.04, exhibits a good piezoelectric coeffi- cient at room temperature. However, it is not easily sintered by ordinary sintering technique. A two-step sintering process has been developed for preparing ceramics which can achieve densification without grain growth during the final sintering stage and results in a uniform grain size. So this work investigated the fabrication of lead-free ceramics with the optimal composition ofx= 0.037 5 using two-step sintering method. The two-step sintering technique was optimized, and relationships between microstructure and piezoelec- tric properties were studied. Under the optimal sintering process： 01 = 1 120 ℃, t1 = 10 min, 02 = 1 000 ℃, t2 = 5 h, excellent properties of piezoelectric strain constant d33 = 261 pC/N, electromechanical quality factor Qm = 29, relative dielectric constant εr = 1 659, and electromechanical coupling coefficient kp = 0.47 were achieved.
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