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.
采用原位化学反应(in-situ chemical reaction)法制备了Nafion-TiO2复合膜,利用X射线衍射(XRD)、红外衰减全反射法(FT-IR-ATR)和红外(FT-IR)压片法对Nafion膜及Nafion-TiO2复合膜的结构进行了表征。首次用砂纸打磨的方法制备了Nafion膜的粉末试样,并成功地应用于红外光谱的测试与分析。研究表明砂纸打磨的方法操作更简便,并且所获得的复合膜的结构信息更全面。Nafion膜的孔腔内掺入了纳米级TiO2粒子,TiO2粒子的加入对膜的主体结构没有改变。
