Ce0.8Sm0.1Nd0.1O2-δ/La10Si6O27复合电解质材料的电学性能研究

Electrical Properties in Ce0.8Sm0.1Nd0.1O2-δ/La10Si6O27 Composite Electrolytes

摘要:

分别采用自蔓延燃烧法和溶胶凝胶法制备了Ce0.8Sm0.1Nd0.1O2-δ(SNDC) 与La10Si6O27(LSO) 粉体,按照不同的比例制备了SNDC/LSO复合材料。粉体进行模压成型、冷等静压处理,生坯在不同温度(1500℃,1550℃,1600℃)下烧结10h,获得致密的块体电解质材料。对样品进行物相、微观形貌、电导率测试并分析,结果表明：SNDC/LSO复合材料仍保持磷灰石相和萤石相,没有其他相生成,添加LSO使复合材料的晶粒尺寸减小。烧结温度升高有利于30%LSO样品电导率的提高,对于1500℃烧结的样品而言,LSO的添加降低了复合材料的电导率。

Abstract:

Samarium and neodymium co-doped ceria (Ce0.8Sm0.1Nd0.1O2-δ or SNDC) and apatite-type lanthanum silicate (La10Si6O27or LSO) powders were prepared by citric-nitrate self-combustion and Sol-gel method respectively.Composite materials were obtained by mixing two powders at different proportion.Powders were molded into shaps and isostatic cool pressed, then sintering at different temperature (1500℃,1550℃,1600℃) for 10 hours. Samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and electrical conductivity measurement. What we can know from the results is that no impurity phase exists in SNDC/LSO composites, and the grain size decreases with the addition of LSO. High sintering temperature can help to improve the conductivity of 30wt%LSO sample, moreover, the addition of LSO reduced the conductivity of composite electrolytes which sintered at 1500℃.