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中文摘要：
通过固相法合成Na0．5Bi0.5TiO3＋xmol％Co^3＋（简写为：NBT-xC）体系无铅压电陶瓷，并对其相结构、压电、介电及铁电性能进行了研究。XRD分析结果表明，所有组成均形成三方钙钛矿结构。SEM扫描电镜照片显示CO2O3的引入有利于晶粒长大，提高致密度。随着Co含量的增加，陶瓷的压电常数如，机电耦合系数Kp都略有下降，机械品质因素Qm有明显提高，在x=3时达到极大值：Qm=934，同时介电损耗出现极小值：tgδ=0．02（1kHz），综合得出Co离子起“硬性掺杂”作用。
英文摘要：
Lead-free piezoelectric ceramics Na0.5Bi0.5TiO3＋xmol%Co3＋（abbreviated as： NBT-xC）are prepared by the solid state reaction method. Effects of the amount of Co3＋ on the phase structure and electrical properties are studied. X-ray diffraction （XRD） indicates that each composition forms a pure rhombohedral perovskite phase. Scanning electron microscope （SEM） photographs show a remarkable growth of grains and compact structures are obtained with Co3＋. doped. The doping with Co^3＋ enhances the mechanical quality factor Qm significantly, whereas the dissipation factor tgδ has a minimum value at x=3. Meanwhile, addition of Co3＋ leads to small decreases of piezoelectric constant d33 and planar electromechanical coupling kp. The composition of NBT-3C ceramics exhibit maximum mechanical mechanical quality factor Qm of 934, dissipation factor tgδ of 0.02 at lkHz. These results demonstrate that the doping of Co3＋ makes a ＂hard doping＂ effect.
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