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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

La9(SiO4)6-x(VO4)xO1.5+0.5x的合成及其导电性能的研究

王贵领1,2, 张密林1, 赵辉2,
霍丽华2, 孙丽萍
  

  1. 1. 哈尔滨工程大学化工学院, 哈尔滨 150001; 2. 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
  • 收稿日期:2005-10-11 修回日期:2005-12-21 出版日期:2006-09-20 网络出版日期:2006-09-20

Synthesis and Conducting Properties of La9(SiO4)6-x(VO4)xO1.5+0.5x

WANG Gui-Ling1,2, ZHANG Mi-Lin1, ZHAO Hui2, HUO Li-Hua2, SUN Li-Ping2   

  1. 1. College of Chemical Engineering, Harbin Engineering University, Harbin 150001, China; 2. Laboratory Functional Materials, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
  • Received:2005-10-11 Revised:2005-12-21 Published:2006-09-20 Online:2006-09-20

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摘要： 利用溶胶-凝胶法低温合成了钒掺杂硅酸盐氧基磷灰石La9(SiO4)6-x(VO4)xO1.5+0.5x (x=0、0.5 和1), 经XRD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, V的掺杂使电导率大大提高, 700℃C时La9(SiO4)5(VO4)O2电导率为5.23×10-3S·cm-1, 与未掺杂V的La9(SiO4)6O1.5相比提高了5倍. 氧分压PO2=105～1Pa时, La9(SiO4)6O1.5的电导率不改变, 而La9(SiO4)_5(VO4)O2的电导率则随着氧分压的降低而稍有增加, 表明钒的掺杂在体系中引入n型电子导电.

关键词: 溶胶-凝胶法, 氧基磷灰石, 间隙氧传导, 电化学阻抗谱

Abstract: The V-doped silicate oxyapatites La9(SiO4)6-x(VO4)xO1.5+0.5x (x=0, 0.5 and 1) were synthesized successfully via a sol-gel method at 800circC. The apatite phases were characterized by X-ray diffraction (XRD). Conducting properties were studied by electrochemical impedance spectroscopy (EIS). It is found that the conductivities are influenced by increasing vanadium content, the conductivity of La9(SiO4)5(VO4)O2 is 5.23×times 10-3S·cm-1 at 700circC, it is about 5 times higher than La9(SiO4)6O1.5.
The electrical conductivity of La9(SiO4)6O1.5 is almost independent
of the oxygen partial pressure from 105 to 1Pa, but that of La9(SiO4)_5(VO4)O2
is minor increased. This result may indicate n-type electron conduction
generated in the vanadium doped system.

Key words: sol-gel method, oxyapatite, interstitial oxygen ion conduction, electrochemical impe-dance spectroscopy (EIS)

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