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Citation: WANG Gui-Ling, ZHANG Mi-Lin, ZHAO Hui, HUO Li-Hua, SUN Li-Ping, GAO Shan. Synthesis and Conducting Mechanism of Ca_2+xLa_8-x(SiO₄)₆O_2-0.5x[J]. Chinese Journal of Applied Chemistry, ;2006, 23(7): 782-785. shu

Synthesis and Conducting Mechanism of Ca_2+xLa_8-x(SiO₄)₆O_2-0.5x

WANG Gui-Ling ^a,b ,
ZHANG Mi-Lin ^a ,
ZHAO Hui ^b,, ,
HUO Li-Hua ^b ,
SUN Li-Ping ^b ,
GAO Shan ^b

1.
a College of Chemical Engineering, Harbin Engineering University, Harbin;
2.
b School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080

Corresponding author: ZHAO Hui,
Received Date: 28 August 2005
Available Online: 12 January 2006
Fund Project: 黑龙江省自然科学基金重点项目(ZJG03-4) (ZJG03-4)黑龙江省海外学人基金(1054HQ003) (1054HQ003)

The silicate oxyapatites Ca_2+xLa_8-x(SiO₄)₆O_2-0.5x(x=0,0.5,1.0 and 2.0) were synthesized via a sol-gel method.The apatite phases were characterised by means of X-ray diffraction(XRD). Cell parameters a and c decreased with increasing composition parameter x.Conducting mechanism was studied via electrochemistry impedance spectroscopy(EIS),it indicated that oxygen ion migration in Ca_2+xLa_8-x(SiO₄)₆O_2-0.5x was via a vacancy conduct mechanism.With increasing the amount of O^2-,the conductivity is consi-derably enhanced,and activation energy is lowered;however,when the amount of O^2- is 2,the conductivity is reduced,and activation energy is increased.The conductivity is almost independent of the oxygen partial pressure,this suggests that the silicate apatites are pure oxygen ionic conductors.
- sol-gel method,
- silicate oxyapatite,
- vacancy conducting mechanism,
- electrochemistry impedance spectroscopy(EIS)
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Synthesis and Conducting Mechanism of Ca_2+xLa_8-x(SiO₄)₆O_2-0.5x