用柠檬酸和乙二醇做络合剂和燃料, 硝酸盐做氧化剂, 用氨水调节溶胶pH值, 通过溶胶凝胶-自燃烧法一步合成了可用于固体氧化物燃料电池(SOFC)的新型固体电解质La9.33Si6O26. 用XRD、TEM等分析方法对合成粉体进行了物相测定与形貌观察, 并初步考察了粉体的烧结性能. 结果表明:通过工艺参数的有效设计, 溶胶-凝胶和自燃烧过程可以在短时间内达到合成所需要的高温, 一步合成粒径约为150～300nm的单相La9.33Si6O26超细粉体, 其烧结温度比固相法制备的粉体的烧结温度约低200℃.
Single-phase and ultrafine La9.33Si6O26 powders were directly synthesized by a sol-gel self-combustion method using citric acid and ethylene alcohol as chelating reagents and fuels, nitrate as oxidant and ammonia to adjust the pH value of the system. XRD and TEM were employed for the phase identification and morphological observations of the obtained powders, which sintering performance was also studied. The results show that single-phase La.33Si6O26 powders with particles sizes ranging from 150nm to 300nm can be directly and rapidly synthesized through sol-gel and self-combustion processes without ary additional thermal solid reactions on the properly selected reaction conditions. The ultrafine powders possess very high sintering activities, and can be well sintered at 200℃ lower than the sintered temperature of the powders derived from conventional solid reactions.
参考文献
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