为了进一步改善羰基铁的低频吸波性能,采用溶胶-凝胶法制备了BaTiO_3表面改性羰基铁的复合吸波剂,并通过X射线衍射仪、SEM、EDS和矢量网络分析仪等手段对复合吸波剂的微观形貌、结构组成、电磁性能和吸波性能进行了分析和研究。结果表明...为了进一步改善羰基铁的低频吸波性能,采用溶胶-凝胶法制备了BaTiO_3表面改性羰基铁的复合吸波剂,并通过X射线衍射仪、SEM、EDS和矢量网络分析仪等手段对复合吸波剂的微观形貌、结构组成、电磁性能和吸波性能进行了分析和研究。结果表明,随包覆量的增加,BaTiO_3吸附在羰基铁表面并逐渐团聚,介电常数显著增大,磁导率略微下降,低频段阻抗匹配性能及电磁波衰减能力得到提升。搅拌时间为10 min的复合吸波剂在3~5 GHz范围内反射率均小于-10 d B。通过BaTiO_3对羰基铁表面改性能够调节介电常数并显著提升材料的低频吸波性能。展开更多
The title complex,(1S)-1,1'-bis{[N-ethyl-N-(1-methylethyl)-amino]carbonyl}-2-(hydroxyldiphenylmethyl)-ferrocene([Fe(C_(24)H_(22)NO_(2))(C_(11)H_(16)NO)]_(2)·H_(2)O,Mr=1207.13),was synthesized via(-)-Sparteine...The title complex,(1S)-1,1'-bis{[N-ethyl-N-(1-methylethyl)-amino]carbonyl}-2-(hydroxyldiphenylmethyl)-ferrocene([Fe(C_(24)H_(22)NO_(2))(C_(11)H_(16)NO)]_(2)·H_(2)O,Mr=1207.13),was synthesized via(-)-Sparteine-mediated enantioselective directed ortho-lithiation of 1,1‘-bis{[N-ethyl-N-(1-methylethyl)-amino]carbonyl}-2-(hydroxydiphenylmethyl)-ferrocene.The structure of the rifle compound was determined by X-ray single-crystal diffraction.The crystal belongs to the orthorhombic system,space group P2_(1)2_(1)2_(1),with a=10.266(2),b=17.676(4),c=34.097(7)A,V=6187(2)A3,Z=4,C_(70)H_(86)Fe_(2)N_(4)O_(7),Dc=1.296 g/cm^(3),μ=0.527 mm^(-1),T=113(2)K,F(000)=2568,the final R=0.0469 and wR=0.0984 for 13940 observed reflections with I〉2σ(I).The neighboring ferrocene derivatives are joined into dimers via O-H…O=C intermolecular hydrogen bonding by a water molecule.Besides,the dimers form neat rows along the a axis.展开更多
文摘为了进一步改善羰基铁的低频吸波性能,采用溶胶-凝胶法制备了BaTiO_3表面改性羰基铁的复合吸波剂,并通过X射线衍射仪、SEM、EDS和矢量网络分析仪等手段对复合吸波剂的微观形貌、结构组成、电磁性能和吸波性能进行了分析和研究。结果表明,随包覆量的增加,BaTiO_3吸附在羰基铁表面并逐渐团聚,介电常数显著增大,磁导率略微下降,低频段阻抗匹配性能及电磁波衰减能力得到提升。搅拌时间为10 min的复合吸波剂在3~5 GHz范围内反射率均小于-10 d B。通过BaTiO_3对羰基铁表面改性能够调节介电常数并显著提升材料的低频吸波性能。
基金supported by the Major Program of National Natural Science Foundation of China(200572009)Beijing Natural Science Foundation Program and Scientific Research Key Program of Beijing Municipal Commission of Education(KZ200610011006)
文摘The title complex,(1S)-1,1'-bis{[N-ethyl-N-(1-methylethyl)-amino]carbonyl}-2-(hydroxyldiphenylmethyl)-ferrocene([Fe(C_(24)H_(22)NO_(2))(C_(11)H_(16)NO)]_(2)·H_(2)O,Mr=1207.13),was synthesized via(-)-Sparteine-mediated enantioselective directed ortho-lithiation of 1,1‘-bis{[N-ethyl-N-(1-methylethyl)-amino]carbonyl}-2-(hydroxydiphenylmethyl)-ferrocene.The structure of the rifle compound was determined by X-ray single-crystal diffraction.The crystal belongs to the orthorhombic system,space group P2_(1)2_(1)2_(1),with a=10.266(2),b=17.676(4),c=34.097(7)A,V=6187(2)A3,Z=4,C_(70)H_(86)Fe_(2)N_(4)O_(7),Dc=1.296 g/cm^(3),μ=0.527 mm^(-1),T=113(2)K,F(000)=2568,the final R=0.0469 and wR=0.0984 for 13940 observed reflections with I〉2σ(I).The neighboring ferrocene derivatives are joined into dimers via O-H…O=C intermolecular hydrogen bonding by a water molecule.Besides,the dimers form neat rows along the a axis.
