【摘要】：采用傳統(tǒng)固相合成法制備了(1-x)(0.97Na0.5K0.5NbO3+0.03LiTaO3)+xBiInO3[(1-x)(KNN+LT)+xBI]無鉛壓電陶瓷,研究了該體系的晶體結(jié)構(gòu)、壓電、鐵電與介電性能。結(jié)果表明:(1-x)(KNN+LT)+xBI陶瓷的晶體結(jié)構(gòu)在室溫下為正交相和四方相兩相共存,隨著BI含量的增加,四方相含量逐漸增多,居里溫度Tc降低,但是正交四方相轉(zhuǎn)變溫度To-t呈現(xiàn)升高趨勢,晶格參數(shù)逐漸增大。隨著BI含量的繼續(xù)增加,Bi在高溫下的揮發(fā)導(dǎo)致氧空位的增多,從而使材料性能下降。在x=0.0015時(shí)得到組分的最佳性能,其居里溫度Tc、相轉(zhuǎn)變溫度To-t、壓電常數(shù)d33、剩余極化Pr、矯頑場Ec分別達(dá)到400℃、126℃、160 pC/N、19.26μC/cm2和7.75 kV/cm。
[Abstract]:Lead-free piezoelectric ceramics (1-x) (0.97Na0.5K0.5NbO3 0.03LiTaO3) xBiInO3 [(1-x) (KNN LT) xBI)] were prepared by conventional solid-state synthesis. The crystal structure, piezoelectric, ferroelectric and dielectric properties of the system were studied. The results show that the crystal structure of (1-x) (KNN LT) xBI) ceramics coexists at room temperature with two phases: orthotropic phase and tetragonal phase. With the increase of BI content, the tetragonal phase content increases and the Curie temperature (Tc) decreases, but the quadrature tetragonal phase transition temperature (To-t) increases. The lattice parameters are gradually increasing. With the increase of BI content, the volatilization of Bi at high temperature leads to the increase of oxygen vacancies, which leads to the decrease of the properties of the materials. The optimum properties of the component were obtained at x = 0.0015. The Curie temperature Tc, phase transition temperature To-t, piezoelectric constant d33 and the remanent polarization Pr, coercive field Ec reached 400 鈩，

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