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采用溶胶-凝胶法(sol-gel)制备了Gd3+掺杂钛酸钡纳米粉体,借助XRD、SEM及矢量网络分析仪等分析测试手段对试样晶相、颗粒粒径、表面形貌及吸波特性进行了研究。结果表明:煅烧温度为1 150℃可获得Gd3+掺杂钛酸钡,是顺电相与铁电相的混合相,Gd3+掺杂钛酸钡可产生间隙杂质能级及电偶极子畴壁共振和弛豫共振的改变,影响吸收特性;网状结构的PPy微观具有更大的离域空间,利于形成导电链和局部导电网络,提高导电率,促进电磁波损耗;Gd3+掺杂BaTO3/PPy复合材料,在5.25 GHz左右有最大回损-32 dB,小于-5 dB的频宽达到1.70 GHz。
Gd3 + doped barium titanate nanopowders were prepared by sol-gel method. The crystal phase, particle size, surface morphology and morphology of the samples were characterized by means of XRD, SEM and vector network analyzer. Absorption characteristics were studied. The results show that Gd3 + -doped barium titanate is obtained at calcination temperature of 1 150 ℃, which is a mixed phase of paraelectric phase and ferroelectric phase. Gd3 + -doped barium titanate can generate interstitial impurity level and electric dipole domain wall resonance Relaxation of the resonance changes, affecting the absorption characteristics; PPy microstructure of the network structure has a larger delocalization space conducive to the formation of conductive chains and local conductive network to improve conductivity and promote electromagnetic loss; Gd3 doped BaTO3 / PPy composite, With a maximum return loss of -32 dB at around 5.25 GHz, the bandwidth below -5 dB reaches 1.70 GHz.