采用溶胶凝胶法制备了钙钛矿型氧化物La1-xNaxCoO3(0≤x≤0.3)超微粉末,用XDR分析该材料的相结构,表明样品为R-3C单相结构.用SEM表征了该材料的微观形貌,观察到样品颗粒尺寸随着掺杂量的增加而增大.用PPMS物性检测仪测量了该材料低温磁滞回线,证明样品存在复杂相结构.用AV3618型微波矢量网络分析仪测试了样品在2～18 GHz范围内的微波吸收特性.当材料涂层厚度为1.8 mm,x=0.1时,La1-xNaxCo03的吸波性能最佳.在测试频段,最高的吸收峰在11.4 GHz处,峰值高达33.1 dB.
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