权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

聚合物均匀沉淀法调控铁电体超晶格结构及其介电性能

基本信息

批准号：
10650661
负责人：
KAKEGAWA Kazuyuki
金额：
$ 1.47万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650661/
关键词：
Relaxer Pervskite Structure Super Lattice Structure Polyethylene Glycol Dry Method ペロブスカイト型構造

项目摘要

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.

由于居里温度下的扩散相变，弛豫铁电体在介电常数的温度依赖性上有一个宽峰。很难准备的单相钙钛矿结构等典型的relaxtors Pb (MgィイD21/3ィエD2NbィイD22/3ィエD2) Oィイc15ィエD2(中性粒细胞)、Pb (NiィイD21/3ィエD2NbィイD22/3ィエD2) Oィイc15ィエD2(并)和Pb(锌ィイD21/3ィエD2NbィイD22/3ィエD2) Oィイc15ィエD2 (PZN)。介电常数的温度依赖性取决于钙钛矿结构B位阳离子的排列。本研究采用聚乙二醇（PEG）制备松弛剂。聚乙二醇能与阳离子配位，并能溶解各种金属盐。对硝酸金属水合物的聚乙二醇溶液进行热处理，得到聚乙二醇阳离子配合物。聚乙二醇-阳离子配合物中的阳离子排列取决于聚乙二醇的分子量。由松弛剂B位阳离子组成的peg -阳离子配合物被氧化。将含有A位阳离子的氧化物与聚乙二醇阳离子络合物氧化得到的氧化物混合，得到PMN、PNN和La。得到了掺杂的PMN。peg -阳离子配合物中阳离子排列与钙钛矿相数量的关系。用peg -阳离子络合物氧化法制备PMN时，在较低的温度下得到了钙钛矿单相。La掺杂PMN中超晶格结构的形成量随着PEG分子量的增加而增加。PMN介电常数的温度依赖性也取决于PEG的分子量。对所测试的单相钙钛矿结构获得了通过添加1摩尔% BaTiOィイc15ィエD2和PEG-cation复杂的氧化。