摘要
采用传统氧化物陶瓷工艺制备高介电常数、中等饱和磁化强度(4πM_(s))钇铁石榴石铁氧体Bi_(1.2)Y_(1.8-3x)Ca_(3x)Zr_(x)V_(x)Fe_(5-2x)O_(12)(x=0.410~0.455),研究不同烧结温度下Zr^(4+)-V^(5+)联合取代量对材料微观形貌、介电常数(ε′)和磁性能的影响。结果表明,965~985℃烧结样品均为纯石榴石相,随着取代量x的增加,965℃和975℃烧结样品的气孔率(P)先下降后上升,x=0.455时,气孔率最低;985℃烧结时,样品气孔率随x增大呈上升趋势;非磁性的Zr^(4+)-V^(5+)离子进入a、d亚晶格,使得4πM_(s)和磁晶各向异性常数(K_(1))逐渐下降,且Zr^(4+)-V^(5+)取代能促进晶粒生长,显著降低铁磁共振线宽(ΔH),但会引起介电常数下降。
Yttrium iron garnet ferrites Bi_(1.2)Y_(1.8-3x)Ca_(3x)Zr_xV_xFe_(5-2x)O_(12)(x=0.410~0.455)(x=0.410 to 0.455) with moderate saturation magnetization(4πM_s) were prepared by a traditional oxide ceramic process.Effects of Zr^(4+)-V^(5+) substitution on the microstructures,dielectirc constant(ε′) and magnetic properties of the materials sintered at different temperatures were studied.The results show that the samples sintered at 965 to 985 ℃ exhibit the pure garnet phase.With the increase in Zr^(4+)-V^(5+) substitution content x,the porosity(p) of the samples sintered at 965 ℃ and 975 ℃ decreases first and then increases.The sample has the minumum porosity when x=0.455 sintered at 985 ℃,the porosity of sintered samples goes up gradually with the increase of x,while the magnetocrystalline anisotropy constant(K_1) and saturation magnetization decline accordingly because the non-magnetic Zr^(4+)-V^(5+)ions replace Fe^(3+) ions on the a and d sites.In addition,Zr^(4+)-V^(5+) substitution promotes the grain growth and decreases the magnetocrystalline anisotropy constant,thus significantly reduces the ferromagnetic resonance linewidth(ΔH),but it results in the decrease in dielectric constant.
作者
黄鑫
蒋晓娜
孙科
张晓峰
李凌峰
张方远
余忠
邬传健
兰中文
HUANG Xin;JIANG Xiao-na;SUN Ke;ZHANG Xiao-feng;LI Ling-feng;ZHANG Fang-yuan;YU Zhong;WU Chuan-jian;LAN Zhong-wen(School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China;Dongyang First Magnetics Co,Ltd,Dongyang 322105,China)
出处
《磁性材料及器件》
CAS
2024年第4期1-6,共6页
Journal of Magnetic Materials and Devices
基金
四川省青年科技创新研究团队项目(2022JDTD0018)。