CAJ | 학술논문

采用固相反应法制备了Mg1-xCuxFe2O4(x=0, 0.4, 0.6和0.8)系多晶铁氧体,分别采用X射线衍射(XRD)、扫描电镜(SEM)和振动样品磁强计(VSM)对样品的结构和静态磁性能进行了表征,并测试了磁环在 10 kHz~1MHz范围的磁导率、品质因数以及功率损耗.结果表明,Cu含量x= 0~0.6时,样品均为单相立方尖晶石结构,Cu含量进一步增加至x= 0.8时呈现大量的四方相另相;晶粒尺寸和密度均随x值增加逐渐增大,而电阻率则呈减小趋势;饱和磁化强度由20.7 Axm2/kg逐渐增大到30.4 Axm2/kg,矫顽力先减小后增大,在x = 0.6时具有最小值445.7 A/m.利用适量的Cu2+取代Mg2+可以提高Mg1-xCuxFe2O4铁氧体的磁导率并降低其品质因数,样品的功耗相应地明显增大;在交变磁场频率为370kHz时,磁通密度低于20 mT范围内,Mg0.4Cu0.6Fe2O4具有相对较高的功耗.
채용고상반응법제비료Mg1-xCuxFe2O4(x=0, 0.4, 0.6화0.8)계다정철양체,분별채용X사선연사(XRD)、소묘전경(SEM)화진동양품자강계(VSM)대양품적결구화정태자성능진행료표정,병측시료자배재 10 kHz~1MHz범위적자도솔、품질인수이급공솔손모.결과표명,Cu함량x= 0~0.6시,양품균위단상립방첨정석결구,Cu함량진일보증가지x= 0.8시정현대량적사방상령상;정립척촌화밀도균수x치증가축점증대,이전조솔칙정감소추세;포화자화강도유20.7 Axm2/kg축점증대도30.4 Axm2/kg,교완력선감소후증대,재x = 0.6시구유최소치445.7 A/m.이용괄량적Cu2+취대Mg2+가이제고Mg1-xCuxFe2O4철양체적자도솔병강저기품질인수,양품적공모상응지명현증대;재교변자장빈솔위370kHz시,자통밀도저우20 mT범위내,Mg0.4Cu0.6Fe2O4구유상대교고적공모.
Polycrystalline Mg1-xCuxFe2O4(x=0, 0.4, 0.6 and 0.8) were prepared using solid-state reaction technique. The structure and static magnetic properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). Furthermore, the permeability, quality factor and core loss were measured within 10 kHz-1 MHz. The results indicate that the sintered Mg1-xCuxFe2O4 ferrites withx= 0~0.6 show a single-phase cubic spinel structure, but the sample withx = 0.8 exhibits an another phase with tetragonal structure. Moreover, it is observed that both grain size and density substantially increase with increasingx, whereas the resistivity shows a decrease. The saturation magnetization of the samples gradually increases from 20.7 Axm2/kg (x=0) to 30.4 Axm2/kg (x=0.8), while the coercivity decreases initially, reaches a minimum value of 445.7 A/m atx=0.6, and then increases with further increase in Cu content. A proper Cu2+ substitution for Mg2+ in the Mg1-xCuxFe2O4ferrites can improve the magnetic permeability and decrease the quality factor. Accordingly, the Cu-doped MgFe2O4 ferrites exhibit a significant increase in the core loss. At the frequency of 370 kHz, the Mg0.4Cu0.6Fe2O4ferritecan realize relatively high loss under an AC magnetic flux density below 20 mT.