AB位掺杂铁酸铋陶瓷的光电性能研究

摘要铁电磁体是一种多铁性材料，具有比较高的介电常数以及较为显著的压电效应。因为这些特性，使得这类材料在信息存储，多状态存储器，磁数据存储介质，致动器，传感器，量子的电磁铁，微电子器件和自旋电子器件上具有很大的应用潜力。但是 BiFeO3具有漏电流大和磁电耦合效应小的缺点。本文对BiFeO3陶瓷进行合适的A、B位掺杂，期望获得更优秀的铁电和介电性能。
本文采用快速液相烧结方法，在A位掺了Sm3+，B位掺杂了Mn、Co和Ti，得出了在掺杂了Mn含量为2%的样品中，在外加极化电场为150 kv/cm时，获得了最大d33值，为40 pC/N。对于Mn含量为5%的样品中，在外加电场为140 kv/cm时剩于极化强度Pr最大，为14.7 μC/cm2。Mn4+的掺杂使陶瓷样品的剩于极化强度提高了较大的幅度。在低频下，掺杂使介电常数增大。22683
关键词铁电磁体掺杂快速烧结   剩余极化
毕业论文设计说明书（论文）外文摘要
Title    The Photoelectric Properties Research Of AB-Doped BiFeO3 Ceramics
Abstract
Ferroelectromagnets are a kind of multiferroic materials and they are also characterized by high dielectric constant, remarkable piezoelectric effects. Because of these characteristics，ferroelectromagnets have great potential in the field of information storage, multiple-state memories, magnetic data-storage media,actuators, transducers, sensors, quantum electromagnets, microelectronic devices, and spintronics devices. But BFO has also disadvantages of low magnetization,large leakage current and small magnetoelectronic coupling effect. In this paper,we hope that A-site and B-site doped ceramics can make better properties of ferroelectric and dielectric.
In this paper,we use the method of rapid liquid-phase sintering to prepare A-doped BiFeO3 by Sm taking the place of Bi atoms. And B-doped BiFeO3 by Mn、Co and Ti.In the sample of Mn-doped with content of 2%,when the poling electric field is 150 kv/cm, the maximum d33 value is 40 pC/N. In the sample of Mn-doped with content of 5%, the remnant polarization Pr is 14.7 μC/cm2 when the external electric field is 140 kv/cm.The ceramic of Mn-doped increases remnant polarization. At low frequencies, the dielectric constant increases with the doping content.
Keywords Ferroelectromagnets Doping Rapid Sintering   polarization
目   次
1   引言
    1.1 铁电磁材料.1
    1.2 铁电磁材料的发展和研究现状.3
    1.3 BiFeO3 .4
       1.3.1 BiFeO3的概述...4
       1.3.2 BiFeO3研究现状.5
    1.4 BiFeO3陶瓷的掺杂改性...5
1.5 本论文研究的内容和意义 6
2   实验方法及原理 ... 8
    2.1快速液相烧结法介绍 8
2.2 掺杂BiFeO3陶瓷的制备 . 8
         2.2.1 制备试剂与仪器 .. ... 8
         2.2.2 前驱体粉末配制 . 9         2.2.3 粉末压片 ... 9
2.2.4 陶瓷烧结.. . 9
         2.2.5 电极的制备 . 9
     2.3陶瓷性能表征. 10
         2.3.1 陶瓷物相分析... 10
         2.3.2 压电性能测试... 10 AB位掺杂铁酸铋陶瓷的光电性能研究:http://www.youerw.com/cailiao/lunwen_15399.html