摘要
采用固相法工艺,以钇铁石榴石(Y3Fe5O12,YIG)和钛酸锶钡(Ba0.5Sr0.5TiO3,BST)为原料,制备出了一系列YIG/BST铁磁/铁电复合介质.利用XRD和SEM对复合介质的物相和微观形貌进行了观察,并对其介电性能、磁性能进行了详细研究.结果表明:在一定温度下烧结所得的复合介质,铁电相和铁磁相两相独立存在.(1-x)YIG-xBST(x=0.1,0.2,0.3,0.4,0.5)复合介质具有良好的介电性能:室温下,随着频率的升高(10^2~10^6 Hz),各组分复合介质的介电常数和介电损耗逐步下降;频率为1 M Hz时,随着BST含量的增加,复合介质的介电常数升高,介电损耗先急剧减小而后趋于稳定;随着温度的升高(0~400℃),不同频率下各组分复合介质的介电常数、介电损耗逐步增加.复合介质表现出典型软磁体的磁滞回线形状,随着BST含量的增加,饱和磁化强度(Ms)逐渐降低,磁导率减小.同时,对复合介质超材料结构的微波性能进行了研究,结果表明超材料结构可实现磁可调.
A series of YIG/BST ferromagnetic/ferroelectric composites were prepared by solid-state reaction using yttrium iron garnet(Y3Fe5O12)and barium titanate(Ba0.5Sr0.5TiO3).The phase and microstructure of the composites were investigated by XRD and SEM,and the dielectric and magnetic property were studied in detail.The results show that the ferroelectric phase and ferromagnetic phase exist independently when the composite is sintered at a certain temperature;(1-x)YIG-xBST(x=0.1,0.2,0.3,0.4,0.5)composites possess great dielectric properties:at room temperature,with increasing frequency(102-106Hz),the dielectric constant of each component composite and the dielectric loss decreases gradually;when the frequency is 1 MHz,the dielectric constant of the composite increases with the increase of BST content,and the dielectric loss first drops and then stabilizes;with the increase of temperature(0-400℃),the dielectric constant and dielectric loss of each composite at different frequencies gradually increase.The composites exhibit the hysteresis loop shape of a typical soft magnet.As the BST content increases,the saturation magnetization(Ms)gradually decreases,and the magnetic permeability decreases.The microwave property of the composite based metamaterial structure was studied.The results show that it can realize magnetic tunability.
作者
郭鸿霞
张家萌
王青敏
毕科
GUO Hong-xia;ZHANG Jia-meng;WANG Qing-min;BI Ke(School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2020年第6期43-49,共7页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(61774020,51972033)。
关键词
铁磁/铁电复合介质
钛酸锶钡
钇铁石榴石
介电性能
磁性能
微波性能
ferromagnetic/ferroelectric composite media
barium titanate
strontium iron garnet
dielectric property
magnetic property
microwave property
