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利用溶胶-凝胶法在800℃合成了硅酸盐氧基磷灰石La10-x(SiO4)6O3-1.5x(x=0,0.17,0.33,0.50和0.67),经XRD表征所得产品为磷灰石相。以电化学阻抗谱研究了硅酸盐氧基磷灰石的导电性能,体系的电导率随着间隙氧和阳离子空位数量的增多而加大,La9.33(SiO4)6O2的电导率较La9.5(SiO4)6O2.25大,是由于前者有较多的阳离子空位所致,700℃时La10(SiO4)6O3的电导率为7.98×10-3S.cm-1,比La9.33(SiO4)6O2的电导率提高了5倍。氧分压从105~1 Pa变化时电导率保持不变,证明硅酸盐氧基磷灰石在较宽的氧分压范围内为O2-导电。
Silicate oxyapatite La10-x (SiO4) 6O3-1.5x (x = 0, 0.17, 0.33, 0.50 and 0.67) was synthesized by sol-gel method at 800 ℃. The product was characterized by XRD Graystone. The electrical conductivity of silicate-apatite was studied by electrochemical impedance spectroscopy. The conductivity of the system increased with the increase of interstitial oxygen and cation vacancies. The conductivity of La9.33 (SiO4) 6O2 was higher than that of La9. 5 (SiO4) 6O2.25 is due to the more cationic vacancies in the former. The conductivity of La10 (SiO4) 6O3 is 7.98 × 10-3S.cm-1 at 700 ℃, which is higher than that of La9.33 (SiO4) The conductivity of 6O2 has been increased by 5 times. The conductivity remained unchanged when the partial pressure of oxygen changed from 105 to 1 Pa, indicating that silicate apatite was O2-conductive over a wide oxygen partial pressure range.