Regulation of Super Lattice Structure of Ferroelectrics by Homogeneous Precipitation Method with Polymer and Their Dielectric Property

放松或铁电在居里温度上有一个宽峰，即对dielectric constant due to the differuse phase transition在居里温度上的温度依赖。It is difficult to prepare the single phase of perovskite structure for the typical relaxtors such as Pb（Mg型D21/3型D2 Nb型D22/3型D2）O型D23型D2 （PMN）， Pb（Ni型D21/3型D2 Nb型D22/3型D2）O型D23型D2（PNN）， and Pb（Zn型D21/3型D2 Nb型D22/3型D2）O型D23型D2 （PZN）。The temperature dependence of the dielectric constant depends on the cation arrangement in the B site of the perovskite structure。在本研究中，聚乙烯醇（PEG）被用于放松剂的制备。PEG可以通过配方进行协调，也可以解决金属盐的各种类型。PEG-cation复合体被用于对PEG金属硝酸盐水合物溶液的热处理。根据PEG复合体的分子重量，cation arrangement取决于PEG-cation complex。用B站点的放松器的B站点中心被氧化化了的PEG-cation复合体。这些氧化物包含了一个网站，其中氧化物是由PEG-cation复合体的氧化物混合而成的，因此PMN、PNN和La。PPN被发现了。PEG-cation复合体中的氯化物排列与被吸收的perovskite相位的数量之间的关系;当PMN是由PEG-cation复合体的氧化物准备的，而Perovskite单一阶段在较低的温度下获得的，而不是使用的干燥方法。在被掺杂的PMN增加的聚乙二醇分子重量的增加中的超晶格结构的形成数量。PMN的非线性常数的温度依赖性也依赖于PEG的分子重量。PNN的单个相位（perovskite structure of PNN was obtained by adding 1 mol% BaTiO D23）D2 and the oxidation of PEG-cation complex。

The relaxor ferroelectrics have a broad peak on the temperature dependence of the dielectric constant due to the diffuse phase transition at the curie temperature. It is difficult to prepare the single phase of perovskite structure for the typical relaxtors such as Pb(MgィイD21/3ィエD2NbィイD22/3ィエD2)OィイD23ィエD2 (PMN), Pb(NiィイD21/3ィエD2NbィイD22/3ィエD2)OィイD23ィエD2(PNN), and Pb(ZnィイD21/3ィエD2NbィイD22/3ィエD2)OィイD23ィエD2 (PZN). The temperature dependence of the dielectric constant depends on the cation arrangement in the B site of the perovskite structure. In this study, the polyethylene glycol (PEG) was used for the preparation of the relaxers. PEG can be coordinated by the cations and can dissolve various kinds of metal salts. The PEG-cation complex was obtained the heat treatment of the PEG solution of the metal nitrate hydrate. The cation arrangement in the PEG-cation complex depended on the molecular weight of PEG. The PEG-cation complex consisted with the B site cations of the relaxers was oxidized. The oxides which contains the A site cations were mixed with the oxides obtained by the oxidation of the PEG-cation complex so that PMN, PNN, and La. Doped PMN was obtained. The relation between the cation arragement in the PEG-cation complex and the amount of the obtained perovskite phase.When PMN was prepared by the oxidation of PEG-cation complex, the perovskite single phase was obtained at lower temperture than that the dry method was used. The formed amount of the super lattice structure in the La doped PMN increased with an increase of the molecular weight of PEG. The temperature dependence of the dielectric constant of PMN also depended on the molecular weight of PEG. The single phase of the perovskite structure of PNN was obtained by adding 1 mol% BaTiOィイD23ィエD2 and the oxidation of PEG-cation complex.