半化学法制备（Bi2-xNdx）（Zn1/3Nb2/3）2O7微波介电陶瓷与介电性能的研究

Structure and properties of （Bi2-xNdx）（Zn1/3Nb2/3）2O7 ceramics prepared by semichemical method

采用半化学法制备微波介电陶瓷（Bi2-xNdx）（Zn1/3Nb2/3）2O7（0≤x≤0.6），系统地研究了陶瓷的相结构及低频介电性能。结果表明：当Nd^3＋取代量较少伍≤0．25）时，样品的相结构仍然保持单斜焦绿石单相，随着Nd^3＋取代量的进一步增加，样品中出现立方焦绿石相，样品结构呈现单斜相与立方相的共存。同时，样品的介电性能随Nd^3＋取代量的变化为：介电常数先增大后减小，而介电损耗先减小后增大，在X=0.25处取得最佳电性能，分另1是εr=83，tanδ=0．0029（100kHz）。

The structure and dielectric properties of （Bi2-xNdx）（Zn1/3Nb2/3）2O7 microwave dielectric ceramics prepared by semichemical method were investigated. It shows that the crystal structure of the samples is still monoclinic pyrochlore for the lower Nd^3＋ content （x≤0.25）. With the increase of Nd^3＋ content, cubic pyrochlore phase is formed in the crystal structure, the crystal structure of the sample is composed of monoclinic pyrochlore and cubic pyrochlore. With increasing Nd2O3 substitute, the dielectric constant increase at first, and then decrease, moreover, the dielectric loss shows decrease at first, and then increase, The results show that the optimized dielectric properties measured at 100kHz are obtained by x=-0.25 Nd2O3 substitute, which are listed as follows：εr=83,tanδ=0.0029.