CAJ | 학술논문

采用球磨法制备了由四方晶系结构的金红石TiO2和面心立方结构的 NiCo 组成的(NiCo)/TiO2纳米复合材料,并在500℃氩气氛围中对样品进行0．5 h退火处理.应用X射线衍射仪、扫描电镜、振动样品磁强计及微波矢量网络分析仪对纳米复合材料的相组成、形貌、磁性和电磁参数进行了分析.与球磨态样品相比,退火样品 NiCo 的布拉格衍射峰明显变窄,表明晶粒尺寸增加,微观应力减小；与此同时饱和磁化强度增加,矫顽力减小.制备态样品呈现明显的介电共振及磁共振行为,退火导致样品在12~16 GHz内的界面极化和极化损耗显著加强,使样品在厚度为8 mm时,最大损耗由-6．4 dB降至-14．8 dB.同时,退火样品在2．6和5．3 GHz 处的自然共振及10．5,13和15．6 GHz处的交换共振明显增强.
채용구마법제비료유사방정계결구적금홍석TiO2화면심립방결구적 NiCo 조성적(NiCo)/TiO2납미복합재료,병재500℃아기분위중대양품진행0．5 h퇴화처리.응용X사선연사의、소묘전경、진동양품자강계급미파시량망락분석의대납미복합재료적상조성、형모、자성화전자삼수진행료분석.여구마태양품상비,퇴화양품 NiCo 적포랍격연사봉명현변착,표명정립척촌증가,미관응력감소；여차동시포화자화강도증가,교완력감소.제비태양품정현명현적개전공진급자공진행위,퇴화도치양품재12~16 GHz내적계면겁화화겁화손모현저가강,사양품재후도위8 mm시,최대손모유-6．4 dB강지-14．8 dB.동시,퇴화양품재2．6화5．3 GHz 처적자연공진급10．5,13화15．6 GHz처적교환공진명현증강.
(NiCo)/TiO2 nanocomposites composed of tetragonal TiO2 (rutile)and cubic NiCo were prepared by ball milling in Ar atmosphere and then annealed at 500 ℃ for 0.5 h.The phase structure,morphology,the magnetic properties and the electromagnetism parameters of the (NiCo)/TiO2 nanocomposites were examined by X-ray diffraction,scanning electron microscope,vibrating sample magnetometer and vector net work analy-zer.Compared with the as-milled samples,the Bragg reflections of NiCo for the annealed sample are clearly nar-rowed,suggesting a larger grain size and a smaller microstrain,leading to an increase of saturation magnetiza-tion intensity,and a decrease of coercive force.The samples show the behavior of dielectric relaxation and mag-netic resonance,and annealing optimizes the microstructure,which leads to significant strengthen of interface polarization and polarization loss in frequency range 12-16 GHz,while the optimal reflection loss decrease from-6.4 to -14.8 dB for 8 mm thickness.After annealing the nature resonance peaks at 2.6,5.3 GHz,and the ex-change resonance peaks at 10.5,13,15.6 GHz are greatly enhanced.