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›› 2011, Vol. 11 ›› Issue (5): 851-856.

• 材料工程专栏 • 上一篇    下一篇

聚合物前驱体法合成SmAlO3及其微波介电性能

李家茂 丘泰 樊传刚 徐鹏   

  1. 安徽工业大学材料科学与工程学院 南京工业大学材料科学与工程学院 安徽工业大学材料科学与工程学院 南京工业大学 材料科学与工程学院
  • 收稿日期:2011-08-02 修回日期:2011-09-27 出版日期:2011-10-20 发布日期:2011-10-20
  • 通讯作者: 李家茂

Synthesis of SmAlO3 by Polymeric Precursor Method and Its Microwave Dielectric Properties

LI Jia-mao, QIU Tai FAN Chuan-gang， XU Peng   

  1. School of Materials Science and Engineering, Anhui University of Technology College of Materials Science and Engineering, Nanjing University of Technology School of Materials Science and Engineering, Anhui University of Technology College of Materials Science and Engineering, Nanjing University of Technology
  • Received:2011-08-02 Revised:2011-09-27 Online:2011-10-20 Published:2011-10-20
  • Contact: LI Jia-mao,

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被引次数

3

摘要： 以EDTA为络合剂，采用聚合物前驱体法合成了SmAlO3微波介质陶瓷粉体，并研究了SmAlO3的制备过程、热分解机理，表征了粉体性质. 结果表明，添加乙二醇制备的干凝胶在550℃以上基本分解完全，800℃煅烧2 h获得正交钙钛矿结构的SmAlO3单相，合成温度从传统固相反应法的1400℃大幅下降到800℃，所得粉体颗粒呈球形，分散性良好，平均粒径约30 nm. 合成粉体可显著提高SmAlO3的烧结性能，SmAlO3陶瓷在1550℃即可烧结致密，相对密度达97.5%，并显示出优良的微波介电性能，相对介电常数为21, 品质因数为77400 GHz, 谐振频率温度系数为-73.2′10-6 ℃-1.

关键词: SmAlO3, 聚合物前驱体法, 乙二胺四乙酸, 乙二醇, 烧结性, 微波介电性能

Abstract: SmAlO3 microwave dielectric ceramic powder was successfully synthesized by the polymeric precursor method using EDTA as a chelating agent. The polymeric decomposition mechanism of the precursor, the formation process of SmAlO3 and the properties of the particles were characterized. The results show that the dried gel including EG addition is decomposed completely up to 550℃ and single SmAlO3 phase with orthorhombic perovskite structure is found when the calcining temperature is increased to 800℃. Compared with the conventional solid-state reaction route, the synthesis temperature is sharply decreased from 1400 to 800℃. With the average particle size of about 30 nm, the particles of the as-synthesized powder are uniform and spherical. Using the as-synthesized powder as raw material, the sample sintered at 1550℃ for 2 h possesses the highest relative density of 97.5% and exhibits excellent microwave dielectric properties of relative permittivity er=21, quality factor Qf=77400 GHz and temperature coefficient of resonant frequency τf=-73.2′10-6 ℃-1.

Key words: SmAlO3, polymeric precursor method, ethylenediaminetetraacetic acid, ethylene glycol, sinterability, microwave dielectric property

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