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中文摘要：
用网相法制备了MnC03掺杂的0.824（Na0.5Bi0.5）TiO3-0．08（K0．5Bi0.5）TiO3-0．018BaTiO3-0．078SrTiO3（简称（1-x）NKBS—xMn）无铅压电陶瓷，研究了不吲掺杂量的MnCO3（x=0，0．5％，1．0％，1．5％，2．0％摩尔分数）对NKBS陶瓷的结构及电性能的影响。结果表明：所有样品均形成单-的钙钛矿结构；掺杂MnCO3后，促进了陶瓷晶粒的长大，提高了陶瓷的致密度，降低了介质损耗。当掺杂适量的MnCO3（x=0．5％），既能提高陶瓷的平面机电耦合系数kp，也能提高其机械品质因子Qm，表现“软硬双性”的掺杂效应。该系陶瓷具有介电弛豫特性，MnCO3的引入在-定程度上提高了其弥散因子γ。
英文摘要：
Mn-modified 0.824（Na0.5Bi0.5）TiO3-0.08（K0.5Bi0.5）TiO3-0.018BaTiO3-0.078SrTiO3 （abbreviated as （1-x）NKBS-xMn） leadfree piezoelectric ceramics were prepared by the solid state reaction method. The effect of MnCO2 content （0≤x≤2.0%） on the microstructure and electrical properties of the ceramics were studied carefully. It is found that all the samples exhibit a pure perovskite phase. The grain size of those materials increases with the doping of MnCO3. MnCO3 doping can increase the relative density of NKBS ceramics and decrease the dielectric loss tan6. The electromechanical planar coupling factor kp and the mechanical quality factor Qm increase with x=0.5% compared with pure NKBS. This means that the dopant of MnCO3 has ＂soft and hard dopant properties＂. The （1-x）NKBS-xMn system shows relaxor characteristics. The values of the dispersion factor y increase with the MnCO3 content increasing.
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