用溶胶-凝胶法制备BiFe1-xCoxO3样品,用X射线衍射仪、扫描电镜、能谱分析对样品的结构、微观形貌、元素组成进行了表征,用微波矢量网络分析仪测试了样品在2～18 GHz微波频率范围的复介电常数、复磁导率,并计算了损耗角正切及微波反射率.结果表明,当掺杂量x=0、x=0.1、x=0.2,煅烧温度800℃时,产物的主相为钙钛矿型BiFeO3,同时还有杂相Bi25 FeO40,颗粒形貌为尺寸约1.5 μm的立方形;Co的掺入有利于提高体系的微波吸收性能.当样品厚度为1.8mm,x=0.2时,吸收峰值为-26.5 dB,带宽为2.08 GHz,在高频段有良好的微波吸收,材料兼具介电损耗和磁损耗但介电损耗相对较强.
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