| ALa9(SiO4)6O2.5(A=Ca，Sr，Ba)的合成及其电性能 |
| Synthesis and Conducting Properties of Silicate Apatites ALa9(SiO4)6O2.5(A=Ca, Sr and Ba) |
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| 摘要: 利用溶胶-凝胶法在850 ℃合成了硅酸盐氧基磷灰石ALa9(SiO4)6O2.5(A=Ca、Sr和Ba)，经XRD表征所得产品为磷灰石相。以电化学阻抗谱研究了ALa9(SiO4)6O2.5的导电性能，发现A的原子半径越大，体系的电导率越高，活化能却减小。在700 ℃时BaLa9(SiO4) |
| 关键词: 硅酸盐磷灰石 溶胶-凝胶法 间隙氧传导 电化学阻抗谱 |
| 基金项目: |
| Abstract: Silicate apatites ALa9(SiO4)6O2.5(A=Ca, Sr and Ba) were synthesized via a sol-gel method at 850 ℃, the apatite phases have been characterized by X-ray diffraction (XRD), and conducting properties was studied by electrochemical impedance spectroscopy(EIS). It is found that the electrical conductivities of ALa9(SiO4)6O2.5(A=Ca, Sr, Ba) increases with increasing radius of A2+ cations, whilst the activation energy decreases. At 700 ℃, the conductivity of BaLa9(SiO4)6O2.5 is 5.57×10-3 S·cm-1, it is about 8.5 times higher than that of CaLa9(SiO4)6O2.5. Transport number of oxygen ion and the dependence of electrical conductivity on oxygen partial pressure indicate that the charge carriers of the silicate oxyapatite are oxygen ions. |
| Keywords: silicate apatites sol-gel method interstitial oxygen ionic conduction electrochemical impedance spectroscopy (EIS) |
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| 王贵领,赵辉,高山,霍丽华.ALa9(SiO4)6O2.5(A=Ca，Sr，Ba)的合成及其电性能[J].无机化学学报,2008,24(4):576-580. |
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