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

无机材料学报, 2006, 21(5): 1258-1262. doi: 10.3724/SP.J.1077.2006.01258

La₉(SiO₄)_6-x(VO₄)_xO_1.5+0.5x的合成及其导电性能的研究

1.1. 哈尔滨工程大学化工学院, 哈尔滨 150001

2. 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

2. 2. Laboratory Functional Materials, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China

关键词：溶胶-凝胶法 , oxyapatite , interstitial oxygen ion conduction , electrochemical impe-dance spectroscopy (EIS)

Synthesis and Conducting Properties of La₉(SiO₄)_6-x(VO₄)_xO_1.5+0.5x

WANG Gui-Ling , ZHANG Mi-Lin , ZHAO Hui , HUO Li-Hua , SUN Li-Ping

Keywords： sol-gel method , 氧基磷灰石 , 间隙氧传导 , 电化学阻抗谱

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)_xO_1.5+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)₆O_1.5相比提高了5倍. 氧分压P_O₂=10⁵～1Pa时, La₉(SiO₄)₆O_1.5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.

The V-doped silicate oxyapatites La₉(SiO₄)_6-x(VO₄)_xO_1.5+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)O₂is 5.23×times 10^-3S·cm^-1 at 700circC, it is about 5 times higher than La₉(SiO₄)₆O_1.5.
The electrical conductivity of La₉(SiO₄)₆O_1.5 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.

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