以柠檬酸为络合剂,采用溶胶-凝胶(sol-gel)自燃烧方法制备了La0.5Sr0.5MnO3纳米晶体.使用FT-IR,DSC-TG,XRD,波导方法对反应、反应产物以及反应产物的电磁性能进行了研究.结果表明,在凝胶中,金属离子与柠檬酸以络合物的形式存在.凝胶在273℃基本完成自燃烧反应.生成的La0.5Sr0.5MnO3纳米晶体为钙钛矿结构,随着反应温度的提高,产物的粒径逐渐增大.电磁性能结果表明,La0.5Sr0.5MnO3在8 GHz～12 GHz的微波范围内具有明显的介电损耗.随着厚度的增加,混合媒质的反射率逐渐增加,反射率吸收峰随着厚度的增加向低频移动.
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