CAJ | 학술논문

采用固相法制备了(1-x){0.828(Na,Bi)0.5TiO3-0.06(K,Bi)0.5TiO3-0.021BaTiO3-0.091SrTiO3}-xCo2O3(简写为(1- x) NKBST-xCo，x为摩尔百分数)无铅压电陶瓷,研究了不同掺杂量的Co2O3对体系相结构与电性能的影响，XRD结果表明所有陶瓷样品均形成单一的钙钛矿固溶体结构，SEM结果表明少量Co的引入有利于晶粒生长，介电温谱表明Co的引入使得样品在Tm附近频率色散更加明显。室温下电性能表明：适量Co掺杂能够提高体系陶瓷的机械品质因子Qm，降低介质损耗tanδ，同时压电性能有所提高。当x=0.50mol%时，性能最佳：压电常数d33=226 pC/N，机械品质因子Qm=126，介质损耗tanδ=4.68%，平面机电耦合系数kp=33.4%。
채용고상법제비료(1-x){0.828(Na,Bi)0.5TiO3-0.06(K,Bi)0.5TiO3-0.021BaTiO3-0.091SrTiO3}-xCo2O3(간사위(1- x) NKBST-xCo，x위마이백분수)무연압전도자,연구료불동참잡량적Co2O3대체계상결구여전성능적영향，XRD결과표명소유도자양품균형성단일적개태광고용체결구，SEM결과표명소량Co적인입유리우정립생장，개전온보표명Co적인입사득양품재Tm부근빈솔색산경가명현。실온하전성능표명：괄량Co참잡능구제고체계도자적궤계품질인자Qm，강저개질손모tanδ，동시압전성능유소제고。당x=0.50mol%시，성능최가：압전상수d33=226 pC/N，궤계품질인자Qm=126，개질손모tanδ=4.68%，평면궤전우합계수kp=33.4%。
Lead-free piezoelectric ceramics (1-x) (0.828(Na, Bi)0.5 TiO3-0.06(K, Bi)0.5TiO3-0.021BaTiO3-0.091SrTiO3)-xCo2O3 (x~mol%) were prepared by the solid state route. Effects of the amount of Co2O3 on the electrical properties and phase transition were studied. The results of X-ray diffraction revealed that all the ceramic samples were pure perovskite phase;SEM indicated that the suitable Co2O3 addition was beneifcial to the growing of grain size. The temperature dependence of dielectric constant showed that the frequency dispersion was more obvious at the temperature near the Tm. The test results of electrical properties indicated that the addition of Co enhanced the mechanical quality factor Qm , reduced the dissipation factor tanδ, and meanwhile increased the piezoelectric property. The best comprehensive properties of such system can be obtained at x=0.50%:d33, Qm, tanδ, and kp were 226, 126, 4.68%and 33.4%respectively.