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利用溶胶-凝胶法在850℃合成了硅酸盐氧基磷灰石CaxLa9.67-2x/3(SiO4)6O2.5(x=0,0.25,0.50,0.75和1.00)。经X射线衍射、红外光谱和扫描电镜等表征所得样品为磷灰石相。以电化学阻抗谱研究了CaxLa9.67-2x/3(SiO4)6O2.5的导电性能,发现阳离子空位越多,体系的电导率越大,活化能却越小。700℃时,La9.67(SiO4)6O2.5的电导率为2.09×10-3 S/cm,是CaLa9(SiO4)6O2.5的3倍。离子迁移数和氧分压对电导率的研究表明:主要的电荷载体是O2-。
Silicate oxyapatite CaxLa9.67-2x / 3 (SiO4) 6O2.5 (x = 0,0.25,0.50,0.75 and 1.00) was synthesized by sol-gel method at 850 ℃. The samples were characterized by X-ray diffraction, infrared spectroscopy and scanning electron microscopy. The electrochemical properties of CaxLa9.67-2x / 3 (SiO4) 6O2.5 were investigated by electrochemical impedance spectroscopy. The more cationic vacancies, the higher the conductivity of the system, the lower the activation energy. At 700 ℃, the conductivity of La9.67 (SiO4) 6O2.5 is 2.09 × 10-3 S / cm, which is three times that of CaLa9 (SiO4) 6O2.5. Ion transport number and partial pressure of oxygen on the conductivity of the study showed that: the main charge carrier is O2-.