摘要
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.
The silicate oxyapatites Ca2-3xLA8＋2x□x（SiO4）6O2 （x=0, 0.17, 0.33, 0.50, 0.67） was synthesized via a solgel 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 La933□0.67 （SiO4）6O2 is 1.58 × 10^-3 S· cm^-1 at 700 ℃, it is higher about 4270 times than that of Ca2La3（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 O^2- ion conduction over a wide range of oxygen partial pressure.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2006年第5期881-884,共4页
Chinese Journal of Inorganic Chemistry
基金
黑龙江省自然科学基金重点项目(No.ZJG03-4)
黑龙江省科技攻关项目(No.GC04A207)
黑龙江省功能材料高校重点实验室基金项目资助
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
sol-gel method
silicate oxyapatite
oxide ionic conducting mechanism
electrical chemistry impedance spectroscopy （EIS）
