Y_2O_3-BaTiO_3-ZnO陶瓷的制备及其性能的研究

Study on High Temperature Mechanical Properties of Layered Strong Interface Boron Carbide Ceramics

笔者采用传统的固相反应法,制备了掺入Y_2O_3的BaTiO_3-ZnO陶瓷,通过对所制备陶瓷样品的结构、常温介电、压电、铁电性能的分析发现:(1)与未掺入Y_2O_3的BaTiO_3-ZnO陶瓷相比,Y_2O_3的掺入减小了BaTiO_3-ZnO陶瓷的径向收缩率、密度和晶胞体积,同时使材料的晶系结构由立方相转变为四方相结构,Y^(3+)进入BaTiO_3-ZnO陶瓷晶格中并与之形成了固溶体;(2)Y_2O_3的掺入可以提高样品的矫顽场(Ec),但对材料压电系数变化不大,介电常数总体在减小,当未掺入Y_2O_3时,样品的介电常数最大(ε′=2577),样品的介电损耗最小(tanδ=0.0083)。

Traditional solid phase reaction was used for the preparation of （ 1- x%- 6% ）BaTiO3 ＋ 6 （at） % ZnO＋ x （at）% Y2O3 （x =0.05,0.10,0.15,0.20） ceramics. XRD equipment, PM300 piezoelectric analyzer and TF2000 ferroclectric analyzer were used for testing the structure detection of the structure, dielectric, piezoelectricity and ferroelectric properties of samples, with the following conclusions drawn： （1）compared with BaTiO ZnO ceramics without Y20 , the radial shrinkage rate, density and cell volume of BaTiO3- ZnO ceramics decrease when doped Y2O3. At the same time, the crys tal structure of material phase transforms from cubic structure to tetragonal structure; （2）Y2O3 doped can increase the coer cive field and dielectric loss of the samples, but a little change on the piezoelectric coefficient of materials, and reduce the dielectric constant of BaTiO3- ZnO ceramics. Pure BaTiO3- ZnO ceramics have maximum dielectric constant（ε＇= 257 7） , minimum dielectric loss （tanδ= 0.008 3）.