Ca[(Li1/3Nb2/3)1-xTix]O3-δ(0.55≥x≥50) solid solutions with additives were fabricated to develop a new microwave resonator with a low sintering temperature. With the addition of 2.0wt.% B2O3, the maximum densities of Ca[(Li1/3Nb2/3)1-xTix]O-δ (0.15-50.3) ceramics were obtained after sintering at 1000℃. The Ca[(Li1/3Nb2/3)1-xTix]O3-δ ceramics exhibit an orthorhombic phase with the 1:2 ordered structure. As the x composition increases from 0 to 0.5, the dielectric constant, increases from 30 to 60, the quality factor, Q×f, decreases from 30 000 to 14 900 GHz, and the temperature coefficient of resonant frequency, tf, in creases from-17 to 83.6 ppm/℃. Typically, at x=0.2, the specimen shows the optimum dielectric properties: P=40, Q×f =20500GHz (at 8 GHz), and tf=4.7 ppm/℃. Furthermore, the addition of both B2O3 and Bi2O3 was found to be effective in reducing the sintering temperature of Ca[(Li1/3Nb2/3)0.7Ti0.3]O3-δ ceramics to 920℃ without a significant degradation of the microwave dielectric properties.

The electrical properties and phase transition behavior of (Pb0.87La0.02Ba0.1)(Zr0.6Sn0.4KxTix)O3 solid solutions (PLBZST, 0.04%x0.2) were investigated by the X-ray diffraction, permittivity, pyroelectric current, and P-E electric hysterisis loops. As the composition x increased from 0.04 to 0.2, the antiferroelectric ceramics (x%0.07, AFE) with tetragonal phase changed to the ferroelectric relaxors (RFE, 0.09%x). AFE ceramics showed a peculiar diffuse phase transition and dielectric relaxation at the low temperature (down to K100 8C) due to a frustration between AFE and FE state. With an increase in composition x, electrically field-induced AFE-FE switching field (EAFE-FE) and AFE-paraelectric (PE) phase transition temperature (Tc) are depressed in the temperature (T)-Ti composition (x) phase diagram, a FE-AFE-PE triple phase point (Ttr) with the lowest transition temperature occurred at xZ0.09. The pyroelectric currents under an application of various external electric field (E) were measured to identify a T-E phase diagram of the PLBZST compound.

在-100-200℃温度范围内，测量了（Pb0.97La0.02）（Zr0.65Sn0.35-xTix）O3（PZST，0.1≤x≤0.14）反铁电陶瓷的热膨胀性质.实验结果表明，组分在0.1≤x≤0.12的试样室温下为反铁电（AFEt）四方相，热膨胀系数（α）在低温段发生“弯曲”，而变温x射线衍射谱（XRD）显示材料保持四方相结构；当Ti含量在0.125≤x≤0.14时，室温下是铁电三方相（FER），温度升高时FER→AFEt相变体积收缩，AFEt→立方顺电（PEc）相变体积增大；变温XRD谱证明了材料相结构随温度的转变过程.用多元复杂化合物存在纳米线度组分非均匀的观点解释了热膨胀性质随Ti含量演化的物理机理，并得到了该系统的温度2Ti（x）含量相图。

研究了B2O3对Ca（Lil/3Nb2/3）03-δ的烧结性能、物相和微波介电性能的影响。实验结果发现，添加0.5%～4%B2O3可使该陶瓷的烧结温度从1150℃降低到1000℃而不降低微波介电性能，X射线表明材料是正交相结构，但是非化学计量Ca（Lil/3Nb2/3）03-δ随着B2O3含量的增大向化学计量Ca（Lil/4Nb3/4）O3过渡；在Ca[（Lil/3Nb2/3）l-x，Tix]03-δ（O≤x≤0.5）系统中，Ti含量增大时介电常数K增大，Q•f值减小，而谐振频率温度系数（tr）从负变正，对于x=0.2的试样，得到K=40，Q•f=20500GHz，tr=O的一类新型中温烧结微波介质材料。

通过对（Pb0.87Ba0.1La0.02）（Zr0.6TixSn0.4-x）O3（0.04≤x≤0.20）固溶体的介电和偏压热释电性质的研究发现，当Ti含量0.04≤x≤0.07时，材料是反铁电四方相，而当0.09≤x≤0.20时，材料向弛豫型铁电体转化.在温度-Ti含量相图中，x=0.09附近形成了反铁电-铁电-顺电三相共存点（Ttr）。该点的相变温度最底；对于0.04≤x≤0.07的反铁电四方相，低温下呈现介电弛豫特征，并可被外电场诱导为亚稳铁电态，温度升高时，亚稳铁电→反铁电相变，反铁电→顺电相变引起两个热释电流峰，偏置电场下峰位和峰强均发生移动，在温度-电场相图中也形成了铁电-反铁电-顺电三相点。从复杂化合物纳米相分离的观点和晶格动力学出发，讨论了相变与电学性能随Ti含量（x）和外电场（E）变化的物理机理。