Tb在BaTiO3中的固溶和介电、绝缘性质的研究.doc

吉林化工学院毕业论文 Tb在BaTiO3中的的研究tudy on solid solution and dielectric and insulating Properties of Tb in BaTiO3 学生学号： 学生姓名： 专业班级： 应用物理0601 指导教师： 职 称： 教授 起止日期： 2009.9.25～2010.6.13 吉 林 化 工 学 院 Jilin Institute of Chemical Technology摘 要 以钛酸钡基固溶体为主晶相的铁电陶瓷，具有较高的介电常数，良好的铁电、压电、耐压和绝缘性能。通过研究发现，陶瓷电容器具有高介电常数、低介电损耗、低等效电阻以及低等效电感等优势，尤其是钛酸钡(BaTiO3)中介电性能的发现引起众多研究者的关注,并对多种氧化物分别掺杂后体系的介电及结构性能进行了研究。 BaTiO3体系中不同位置上取代离子的尺寸及类型对电容器介质的介电性能具有举足轻重的影响。因为铽离子半径居中，有+3、+4两种价位，可以对钛酸钡进行双位掺杂，且目前国际上尚无这方面的研究，所以本文主要研究了掺杂七氧化四铽（Tb4O7） 对BaTiO3体系介电性能的影响，开发新的陶瓷电容器材料。 本论文的主要内容包括： 1. 采用固相反应法的冷压陶瓷处理技术，以分析纯的碳酸钡、钛酸钡、二氧化钛、七氧化四铽为原料，按照一定的的化学配比，制备一系列铽掺杂钛酸钡陶瓷材料。 2. 利用XRD，IR，介电测试系统等测试分析技术对陶瓷材料的结构、微结构、介电温谱等进行分析。 关键词: 铽掺杂钛酸钡；XRD；IR；X7RAbstract Barium titanate dielectric ceramics containing BaTiO3 solid solutions as major crystal phase have high dielectric constant, good ferroelectric, piezoelectric, oltage-resistant, insulation, capabilities. Through the study, we can found that ceramic capacitors have many advantages such as high dielectric constant, low dielectric loss, low equivalent resistance and low equivalent inductance, especially the finding of dielectric property in barium titanate (BaTiO3) caused the attention of many researchers. They have studied the structure and dielectric properties of the system which is doped with many oxides respectively. The size and type of ions which replace in different. Because the ionic radius of Tb is placed in the middle, Tb has two valences,+3,+4, which determine that it can be dibit doped, and the research of this aspect has not been studied in the international, so this paper mainly studies the influence of dielectric system which is caused by Tb4O7 dopped in BaTiO3,develop new ceramic capacitor materials. The main work is as follows： 1. Using solid state reaction of the Cold pressed ceramics processing technology to the Fenxi Chun barium carbonate, titanium dioxide, Tb4O7 as raw material, in accordance with ce