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Apatite-type lanthanum silicate with special conduction mechanism via interstitial oxygen has attracted considerable interest in recent years. In this work, pure powder of La9.33-2x/3MxSi6O26 (M=Mg, Ca, Sr) is prepared by the sol-gel method with sintering at 1000°C. The powder is characterized by X-ray diffraction (XRD) and scan-ning electron micrograph (SEM). The apatite can be obtained at relatively low temperature as compared to the con-ventional solid-state reaction method. The measurements of conductivity of a series of doped samples La9.33-2x/3MxSi6O26 (M=Ca, Mg, Sr) indicate that the type of dopant and the amount have a significant effect on the conductivity. The greatest decrease in conductivity is observed for Mg doping, following the Ca and the Sr doped apatites. The effect is ultimately attributed to the amount of oxygen interstitials, which is affected by the crystal lat-tice distortion arising from cation vacancies.
Apatite-type lanthanum silicate with special conduction mechanism via interstitial oxygen has attracted considerable interest in recent years. In this work, pure powder of La9.33-2x / 3MxSi6O26 (M = Mg, Ca, Sr) was prepared by the sol- gel method with sintering at 1000 ° C. The powder is characterized by X-ray diffraction (XRD) and scan-ning electron micrograph (SEM). The apatite can be at relatively low temperature as compared to the con -ventional solid-state reaction The measurements of conductivity of a series of doped samples La9.33-2x / 3MxSi6O26 (M = Ca, Mg, Sr) indicate that the type of dopant and the amount have a significant effect on the conductivity. The greatest decrease in conductivity is observed for Mg doping, the following the Ca and the Sr doped apatites. The effect is ultimately attributed to the amount of oxygen interstitials, which is affected by the crystal lat-tice distortion arising from cation vacancies.