摘要
采用溶胶-凝胶法制备了(1-x)BaFe12O19/xBaTiO3复合吸波材料(x=0、0.1、0.3、0.5、0.7、0.9、1)。研究了钛酸钡含量对复合样品晶体结构、微观形貌以及微波性能的影响。结果表明,于900℃煅烧的样品形成了BaFe12O19相和BaTiO3相共存的BaFe12O19/BaTiO3复合体系;当钛酸钡含量在0.3～0.7时,复合样品的介电损耗和磁损耗显著增强,提高了微波吸收性能,拓宽了有效吸收频带;当厚度为3mm时,x=0.5的复合样品在频率为13GHz处的最强吸收峰为14.8dB,x=0.7的复合样品的有效吸收频宽可达3.4GHz。
（1--x）BaFe12O19 /xBaTiO2 composites （x=0,0. 1,0. 3,0.5,0. 7,0. 9,1） were prepared by sol-gel method. The effect of the barium titanate content on structure, morphology and microwave properties of the composites was investigated. The results show that composites calcined at 900℃ have formed a BaFe12 O19/BaTiO3 composite system coexisting of BaFe12O19 and BaTiO3 phases. When the barium titanate content is between 0. 3 and 0. 7, both dielectric loss and magnetic loss of the composites are enhanced significantly, the microwave absorbing properties are improved, and the effective absorption bandwidth is broadened. When the thickness of sample is 3mm and x=0. 5, the composite＇s strongest absorption peak is 14. 8dB at 13GHz, while the effective absorption bandwidth reaches up to 3.4GHz when x= 0. 7.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2012年第24期30-33,40,共5页
Materials Reports
基金
国家自然科学基金(60571043)
湖南省科学计划项目(2011FJ3193)
湖南省自然科学基金(07JJ3103)
关键词
复合材料溶胶-凝胶法
电磁性能
微波吸收
composites, sol-gel method, electromagnetic properties, microwave absorption
