CAJ | 학술논문

用磁场辅助水热法合成镍单质纳米晶材料。未加磁场合成的镍材料由匕首状晶粒构成树枝状微结构，外加磁场下合成的样品由棒状以及片状晶粒构成，而且部分晶粒呈平行排列。外加磁场下合成的样品其磁导率和介电常数在8 GHz处同时为负，具有明显的左手材料特性，而且，还具有良好的微波吸收性能，最大反射衰减为-25 dB,衰减低于-8 dB的频率范围为10.32～13.52GHz，与未加磁场合成的镍样品相比，微波吸收峰从8 GHz处移向12 GHz。
용자장보조수열법합성얼단질납미정재료。미가자장합성적얼재료유비수상정립구성수지상미결구，외가자장하합성적양품유봉상이급편상정립구성，이차부분정립정평행배렬。외가자장하합성적양품기자도솔화개전상수재8 GHz처동시위부，구유명현적좌수재료특성，이차，환구유량호적미파흡수성능，최대반사쇠감위-25 dB,쇠감저우-8 dB적빈솔범위위10.32～13.52GHz，여미가자장합성적얼양품상비，미파흡수봉종8 GHz처이향12 GHz。
Ni nanocrystallites were prepared by hydrothermal method in the presence of applied magnetic field. For Ni sample without applying magnetic field branch-like microstructure composed with sword-like flake was observed. For Ni sample prepared under applied magnetic field, the particles are composed of nano-rod and flake grains, with part particles parallelly ordering. The latter exhibits simultaneously negative permittivity and permeability at 8 GHz and presents remarkable left-handed materials properties. Moreover, it presents a good microwave absorbing performance, with maximum reflection loss of-11 dB at 8.32 GHz and bandwidth less than-8 dB covering a frequency range of 10.32-13.52 GHz. Compared to Ni sample without applying magnetic field, the microwave absorption peak shifts from 8 GHz to 12 GHz for the Ni sample with applying magnetic field.