【摘要】 用固相法制备Li0.45Zn0.3Ti0.2Mn0.03Mn0.03Fe1.99O4铁氧体,研究了CaO-ZnO-B2O3(CZB)玻璃助烧剂对磁性能和结构的影响。结果表明,适量的CZB玻璃相可促进固相反应,显著降低烧结温度。通过X线衍射(XRD)和扫描电镜(SEM)分析表明,CZB玻璃没有影响LiZn铁氧体的尖晶石相结构,且其可促进晶粒生长。磁性能变化规律表明,CZB的质量分数为0.25%时,饱和磁感应强度(Bs)达最大,矫顽力(Hc)降低。Hc在质量分数为2.5%时达到最小,随后有所上升。微掺杂时,毛细管力起主导作用,少量掺杂时,液相中的扩散起主导作用,两者都促进了固相反应。过量掺杂时,玻璃相阻碍晶粒生长,各项异性场增大,导致Bs下降、Hc和铁磁共振线宽(ΔH)增大。添加CZB的LiZn铁氧体在910℃时具有较好的磁性能,可兼容低温共烧技术应用于移相器的设计。更多还原

【Abstract】 The influences of CZB(CaO-ZnO-B2O3)(CZB)glass addition on magnetic properties and structures of ferrite(Li0.45Zn0.3Ti0.2Mn0.03Mn0.03Fe1.99O4)prepared by the standard solid state reaction method was investigated.The results show that the sintering temperature of ferrites was reduced due to the induction of appropriate amount of CZB.X-Ray diffraction(XRD)and scanning electron microscopy(SEM)analysis reveals that the glass phase doping has no effect on the structure of LiZn ferrite.Meanwhile,the grain size achieves a significant growth.The magnetic curve shows that the CZB can not only exhibit the maximal Bs at 0.25% but also low Hcvalues distinctly.With the increasing of CZB glass,the coercivity(Hc)decreases,reaching a minimum at 2.5%and then increases slightly.The solid-phase reaction was promoted due to the key roles of the capillary pressure with few CZB glass addition.Doping small CZB glass,the solid-phase reaction was also promoted.This could be attributed to a dominant diffusion effect in liquid.When the glass was added to excess,glass phase will obstruct the grain in growth so that anisotropy field was increased at the same time,in which a increase in HcandΔH and a decrease in Bs.The LiZn ferrite with CZB glass addition obtains well magnetic properties at sintering temperature of 910 ℃.As a result,this could apply to a design for phase shifter by using LTCC technology.更多还原