The urea-nitrates combustion was introduced to prepare the high purity apatite type alkali earth doped La-9.33Mr (SiO4)sO2+δ(M are Sr, Ca and Mg) conductor at 600 - 800 ℃. The as-prepared samples were investigated by X-Ray Diffraction, Scanning Electron Microscope and Electrochemical Impedance Spectroscopy. The results show that the powders transform into p6-3/m apatite-type after burning. The microcosmic appearance of sintered LSO is altered with the different doping content x. LSO sintered body possesses excellent resistors reversibility and stability. The conductivity is improved efficiently with the doping amounts of the alkali earth metal ions, and the optimal doping content is 0. 2. Under the same doping contents, three kinds of alkali earth metal ions also have effects on the anductivity performance. As the ionic radius increases, doping effect becomes better.%采用尿素-硝酸盐燃烧法在600～800 ℃下制备了较高纯度无杂质相的碱土掺杂磷灰石型La9.33Mx(SiO4)6O2+δ(M为Sr,Ca,Mg)电解质.通过X射线衍射、扫描电镜和交流阻抗测试,对样品的晶体结构、表面微观形貌及电导性能进行了研究.结果表明,燃烧合成的电解质粉体La9.33(SiO4)6O2(LSO)具有p63/m磷灰石型晶体结构;LSO烧结体的微观形貌随x值的不同而出现了细微变化;LSO烧结体具有良好的电阻可逆性和稳定性.适当的掺杂量能有效提高LSO的离子电导率,最佳掺杂浓度为0.2.相同掺杂量下,三种碱土金属阳离子掺杂对电导性能也有一定的影响,随着离子半径的增大,掺杂效果越来越好.
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