中南大学学报（自然科学版）2012，Vol.43Issue(3)：906-910,5.
尖锥八面体Fe3O4的水热合成及微波吸收性能
Hydrothermal synthesis and microwave absorption of sharp octahedral Fe3O4 crystals
摘要
Abstract
With mixed solution of PEG-6000 and water as a reaction medium, Fe3O4 crystal particles were synthesized by hydrothermal method from Fe(OH)2 precursor oxidized by Na2S2O3 in alkaline conditions. The crystal structure and surface morphology of the products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The complex dielectric constant and complex permeability of Fe3O4 samples were measured by microwave vector network analyzer in the frequency range from 2 to 18 GHz. The microwave reflection coefficients of the samples were calculated according to measurements and the microwave absorbing mechanism was discussed. The results show that monodisperse spinel-type Fe3O4 crystal particles with regular sharp octahedral shape and flat surface are obtained by hydrothermal reaction in a certain time, and the microwave reflection coefficient peak of the sample with 2.8 mm thickness is -35 dB at 7.1 GHz frequency and the absorption bandwidth less than -10 dB is 7.9 GHz after hydrothermal growth of 12 h. The microwave absorption is caused by magnetic loss mainly and dielectric loss secondly in the low-frequency range of 2-13 GHz, while dielectric loss mainly but magnetic loss weakly in the high-frequency range of 13-18 GHz. So, the sharp micro-octahedral Fe3O4 is an excellent microwave absorption material with low reflectivity and broadband.关键词
水热反应/Fe3O4/微波吸收/电磁损耗Key words
hydrothermal reaction/ Fe3O4/ microwave absorption/ electromagnetic loss分类
信息技术与安全科学引用本文复制引用
周克省,卢玉娥,尹荔松,秦宪明,邓联文,翟志彩,夏辉..尖锥八面体Fe3O4的水热合成及微波吸收性能[J].中南大学学报（自然科学版）,2012,43(3):906-910,5.基金项目
国家自然科学基金资助项目(60771028) （60771028）
湖南省自然科学基金资助项目(10JJ5049) （10JJ5049）
