| Ca2-3xLa8+2x□x(SiO4)6O2的合成及其导电性能的研究 | |
| Synthesis and Conducting Properties on Ca2-3xLa8+2x□x(SiO4)6O2 | |
| 摘要: | |
| 关键词: 溶胶凝胶法 硅酸盐氧基磷灰石 氧离子传导机理 电化学阻抗谱 | |
| 基金项目: | |
| Abstract: The silicate oxyapatites Ca2-3xLa8+2x□x(SiO4)6O2(x=0, 0.17, 0.33, 0.50, 0.67) was synthesized via a sol-gel method at low temperature. The apatite phases have been characterised by X-ray diffraction (XRD), conducting properties was studied by electrical chemistry impedance spectroscopy (EIS). The conductivity of La9.33□0.67(SiO4)6O2 is 1.58×10-3 S·cm-1 at 700 ℃, it is higher about 4 270 times than that of Ca2La8(SiO4)6O2, the activation energy is decreasing from 1.37 eV to 0.84 eV. With cation vacancies increasing,the conducting mechanism is gradually translation from a direct linear pathway free oxygen ion conduction to a curve pathway interstitial oxygen ion conduction. The electrical conductivities is almost independent of the oxygen partial pressure, this suggests that the oxyapatites exhibited almost pure O2- ion conduction over a wide range of oxygen partial pressure. | |
| Keywords: sol-gel method silicate oxyapatite oxide ionic conducting mechanism electrical chemistry impedance spectroscopy (EIS) | |
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| 王贵领,张密林,赵辉,霍丽华,孙丽萍,高山.Ca2-3xLa8+2x□x(SiO4)6O2的合成及其导电性能的研究[J].无机化学学报,2006,22(5):881-884. | |
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