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

doi:10.3724/SP.J.1077.2006.01258

Abstract

Abstract: 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.

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

CLC Number:

O614
TM911

WANG Gui-Ling,ZHANG Mi-Lin,ZHAO Hui,HUO Li-Hua,SUN Li-Ping. Synthesis and Conducting Properties of La₉(SiO₄)_6-x(VO₄)_xO_1.5+0.5x[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.01258.

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

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