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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (12): 1411-1416. 上一篇    下一篇

研究论文

La10(SiO4)6－x(GaO4)xO3－0.5x的合成及其导电性能

王贵领a 赵 辉*,b 霍丽华b 高 山b   

  1. (a哈尔滨工程大学材料科学与化学工程学院 哈尔滨 150001)
    (b黑龙江大学化学化工与材料学院功能材料省高校重点实验室 哈尔滨 150080)
  • 投稿日期:2007-10-09 修回日期:2007-12-20 发布日期:2008-06-28
  • 通讯作者: 赵 辉

Synthesis and Conducting Properties of La10(SiO4)6－x(GaO4)xO3－0.5x

WANG, Gui-Ling a ZHAO, Hui *,b HUO, Li-Hua b GAO, Shan b   

  1. (a College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001)
    (b Laboratory of Functional Materials, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080)
  • Received:2007-10-09 Revised:2007-12-20 Published:2008-06-28
  • Contact: ZHAO, Hui

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以溶胶-凝胶法合成前驱体, 在950 ℃时烧结制得La10(SiO4)6－x(GaO4)xO3－0.5x (x＝0, 0.5, 1.0, 1.5和2.0)陶瓷样品, 通过TG-DTA, XRD, IR和SEM表征, 所得产品为磷灰石相. 以电化学阻抗谱研究了其导电性能, 发现决定电导率大小的因素有两种, 一是间隙氧的数量, 二是晶胞的大小, 两种因素的综合作用, 使得La10(SiO4)5(GaO4)O2.5的电导率最大, 在700 ℃时其电导率达到4.66×10－2 S•cm－1. 离子迁移数和氧分压对电导率的研究表明, 其主要的电荷载体是O2－离子.

关键词: 硅掺杂磷灰石, 溶胶-凝胶法, 自由氧传导, 间隙氧传导, 电化学阻抗谱

La10(SiO4)6－x(GaO4)xO3－0.5x (x＝0, 0.5, 1.0, 1.5 and 2) was successfully synthesized via a sol-gel method at 950 ℃, their apatite phases have been characterized by TG-DTA, XRD, IR and SEM, and their conducting properties were studied by electrochemical impedance spectroscopy. It was found that the conductivity was mostly influenced by both interstitial oxygen concentration and the volume of a unit cell, and the conductivity of La10(SiO4)5(GaO4)O2.5 was highest among all the synthesized oxyapatites, being 4.66×10－2 S•cm－1 at 700 ℃. Transport number of oxygen ions and the dependence of electrical conductivity on oxygen partial pressure indicate that the charge carriers of the silicate oxyapatite are oxygen ions.

Key words: Si-doped apatite, sol-gel method, free oxygen ion conduction, interstitial oxygen ion conduction, electrochemical impedance spectroscopy