La_xSr_(1-x)MnO_3氧化物的导电和吸收特性

Conducting and Absorbing Properties of La_xSr_(1-x)MnO_3

对LaxSr1 -xMnO3氧化物的导电和吸收特性进行了研究。x =0 5时 ,其电阻率随着温度升高而上升 ,呈现金属导电特性 ,室温电阻率很低 ,为 3× 10 - 5Ω·cm。在 8～ 12GHz频率范围的微波电磁场中 ,它的吸收特性最佳 ,在涂层厚度 2 2 1mm时 ,吸收峰高 2 5dB ,峰宽 3GHz ,这是由于La0 .5Sr0 .5MnO3氧化物是一种铁磁材料 ,在上述频率范围内具有较大的磁损耗和介电损耗。

The conducting and absorbing properties of La x Sr 1- x MnO 3 oxides were investigated. When x =0 5, the sample shows metallic conductivity and its resistivity is very little at room temperature. The sample shows optimal microwave absorption in the frequency range of 8～12 GHz. The microwave absorption peak reaches to 25 dB.