Sc_2O_3掺杂ZrO_2电解质材料的水热合成及其电性能

Hydrothermal Synthesis and Electrical Properties of Sc_2O_3 Doped ZrO_2 Materials

采用水热法合成了SSZ(Sc2O3掺杂的ZrO2)纳米粉体,经成型、烧结得到电解质烧结体。对样品晶相组成、微观形貌、结构进行了表征,并对烧结体进行了电性能分析。研究表明:所得粉体于1500℃下烧结4h可形成致密度达97%的立方萤石结构烧结体,比传统固相方法和Sol-gel法低200℃以上。随烧结温度升高和Sc2O3含量的增加,SSZ样品的电导率先增加后降低,经1500℃烧结的8mol%Sc2O3-ZrO2样品在900℃时电导率为0.23S/cm,800℃为0.13S/cm,优于采用固相法、共沉淀法、Sol-gel等方法制备的同类材料。

Used for the electrolyte of solid oxide fuel cell （SOFC）, Sc2O3-doped zirconia （SSZ）powder with nanoscale, less aggloneration is synthesized by hydrothermal method. SSZ ceramics samples are fabricated by sintering of green compact at 1400- 1600℃. The phase, morphology, structure, and electrical property of SSZ samples are investigated by XRD, SEM, TEM, BET and four-point probe methods. The relative density of the cubic phase sample sintering at 1500℃ for 4 hours is 97% ,and the sintering temperature is 200℃ lower than solid statereaction and sol-gel method. The conductivity of the ceramics is strongly influenced by sintering temperature and Sc2O3 contents. The conductivities of 8mol% Sc2O3 doped zirconia are 0. 23S/cm and 0. 13S/cm at 900℃ and 800℃, respectivey. These conductivity values are much higher than that of similar samples synthesized by solid state reaction, co-precipitation and Sol-gel method.