铁微量掺杂对二钛酸钡陶瓷介电性能的影响 |
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引用本文: | 徐 军,周 淼,赵焕校.铁微量掺杂对二钛酸钡陶瓷介电性能的影响[J].武汉工程大学学报,2014(5):25-28. |
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作者姓名: | 徐 军 周 淼 赵焕校 |
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作者单位: | 武汉工程大学材料科学与工程学院,湖北武汉430074 |
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基金项目: | 教育部留学回国人员科研启动资金;湖北省教育厅科学研究重点项目(D20L01504) |
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摘 要: | 采用常规固相反应法,以碳酸钡、二氧化钛和三氧化二铁为原料,制备微量铁掺杂的二钛酸钡陶瓷,研究了铁掺杂含量对二钛酸钡陶瓷的相纯度、相对密度和介电性能的影响.采用X射线粉末衍射仪检测二钛酸钡陶瓷的相成分,利用精密阻抗分析仪测量其介电性能.结果表明,微量铁元素进入了二钛酸钡晶格,能够获得单相二钛酸钡陶瓷的最大铁掺杂量在0.5%~1%之间.随着铁含量的增加,铁电相变居里温度快速减小,从未掺杂时的415℃降至铁含量为0.02%时的376℃和铁含量为0.5%时的324℃.同时介电常数逐渐减小,介电峰不断发生宽化,但并没有导致弛豫性铁电体的出现.微量铁元素的掺杂在实验测量误差范围内对陶瓷的密度影响不大.
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关 键 词: | 二钛酸钡 铁元素掺杂 介电性能 |
Influence of light-doped Fe on dielectric properties of barium dititantate ceramics |
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Authors: | XU Jun ZHOU Miao ZHAO Huan-xiao |
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Affiliation: | (School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430074,China) |
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Abstract: | To investigate the influence of Fe-doping on the dielectric properties,the phase purity and the relative density of BaTi2O5 ceramics,single-phased Fe-doped BaTi2O5 ceramics were synthesized from BaCO3,TiO2 and Fe2 O3 powders by conventional solid-state reaction.The specimens were characterized by powder X-ray diffraction and Fe contents that can yield pure phase BaTi2 O5 were determined.The dielectric properties were measured by precesion impedance analyzer in a wide temperature range.The results show that light amount of Fe element enteres BaTi2 O5 lattice and the solution limit of Fe-doping in BaTi2 O5 ceramics is between 0.5 % and 1 % ; upon Fe doping,the ferroelectric phase transition temperature of the BaTi2O5 ceramics decrease rapidly,from 415 ℃ at x=0 to 376 ℃ at x=0.02% and 324 ℃ at x=0.5 %.The dielectric constant decreased and dielectric peaks became broadened without dielectric relaxation.Fe doping has little effect on the density of BaTi2 O5 ceramics within the limit of the experimental errors. |
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Keywords: | barium dititantate Fe-doped dielectric property |
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