中文摘要：

采用固相法合成了Sn0.9Mg0.1P2O7用扫描电子显微镜（SEM）、X射线衍射（XRD）测试方法对样品进行了表征．粉末XRD结果表明，该样品为单一立方相SnP2O7结构．采用多种电化学方法研究了样品在中温范围内（323—523K）质子和氧离子导电性．样品在湿润氢气气氛中423K下，电导率达到最大值（5．04×10-2S·cm-1）．该样品在氢气气氛中的离子、质子、氧离子和电子迁移数（Ｎ1）分别为0．95—1．00、0．84—0．96、0．04-0．10和0．00-0．05，该样品在氢气气氛中几乎是一个纯离子导体，其中，质子导电为主，同时具有一定的氧离子导电和少量的电子导电．以该样品为燃料电池固体电解质，组装氢气，空气燃料电池，在398、423和448K时最大输出功率密度分别为18.7、27．7和33．9mW·cm-2．

英文摘要：

Sn0.9Mg0.1P2O7was synthesized in a solid state reaction and characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The XRD pattern indicated that the sample exhibited a single cubic phase. The protonic and oxide-ionic conduction were investigated using various electrochemical methods including AC impedance spectroscopy and gas concentration cells at intermediate temperatures （323-523 K）. The highest conductivity observed was 5.04x 10-2 S-cm-1 in a wet H2 atmosphere at 423 K. The ionic, protonic, oxide-ionic, and electronic transport numbers （N,） were 0.95-1.00, 0.84-0.96, 0.04-0.10, 0.00-0.05, respectively, in a wet hydrogen atmosphere. The results indicate thatSn0.9Mg0.1P2O7 is an almost pure ionic conductor, has dominant protonic conduction, some limited oxide-ionic conduction, but little electronic conduction. A H2/air fuel cell using Sn0.9Mg0.1P2O7as the electrolyte （thickness： 1.5 mm） generated maximum power densities of 18.7 mW.cm-2 at 398 K, 27.7 mW. cm-2 at 423 K. and 33.9 mW. cm-2 at 448 K.