欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用固相法制备了Li掺杂K0.5Na0.5NbO3无铅压电陶瓷，即K0.5Na0.5NbO3＋x／2％Li2CO3（KNN—xL）。研究了不同Li摩尔分数（x分别为0，0．25，0．50，0．75，1.00，1．50）样品的物相组成、显微结构及电性能。结果表明，室温下所有样品都具有正交相的钙钛矿结构。随着Li摩尔分数的增加，样品的压电常数d33平面机电耦合系数k0、机械品质因数Qm及密度p都先升高后降低，介电损耗tanδ普遍比未掺杂的低，当x=0．5时综合性能达到最优，即d33=122pC／N，kp=41％，Qm=115，εr=548，tan δ=0．022，10—4．32g／cm3。另外正交到四方相变温度逐渐降低，居里温度逐渐升高。
英文摘要：
The piezoelectric Li-doped K0.5 Na0.5 NbO3 ceramics, namely K0.5 Na0.5 NbO3 ＋x/2% Li2CO3 （KNN- xL） ,were prepared by the solid state reaction. The phase, microstructure and electric properties Were studied for KNN-xL samples with different Li content （x being 0,s0. 25,0. 50, 0.75,1.00, and 1.50 respectively）. The results show that all samples possess perovskite structure with orthorhombic symmetry. The piezoelectric constant d33 ,planar coupling factor kp, mechanical quality factor Qm and bulk density p of the KNN-xL ceramic samples increased firstly and then decreased with the x content increase. While the dielectric losses tan δ of all modified ceramics were lower than that of pure KNN. The optimum electric properties （that is d33 = 122 pC/N, k p = 41 %, Qm = 115, εr = 548, tan 3= 0. 022 ,p= 4. 32 g/cm3） of the ceramic sample in the composition of x= 0.5 can be obtained. In addition, the phase transition temperature of the orthorhombic-to-tetragonal gradually decreased and the Curie temperature gradually increased with x content increase.
同期刊论文项目
同项目期刊论文
Electronic and Optical Properties of KNbO3,NaNbO3 and K0.5Na0.5NbO3 in Paraelectric Cubic Phase: a C
期刊信息
位置：