Zn-Ti联合取代对LiZnTiMn铁氧体微结构和旋磁性能的影响

Effect of Zn-Ti substitution on the microstructure and gyrpmagnetic properties of LiZnTiMn ferrite

用固相反应法制备Zn-Ti联合取代的Li_(0.42)Zn_(x)Ti_(x-0.16)Fe_(2.637-2x)Mn_(0.1)Bi_(0.003)O_(4)(LiZnTiMn铁氧体,x=0.16~0.50),分析了材料的相结构、微观结构和旋磁性能。890℃烧结样品获得了单一的尖晶石结构。Zn-Ti联合取代有促进烧结的作用,并且可以改变材料的磁晶各向异性常数和Fe2+离子含量,从而降低了铁磁共振线宽和介电损耗;同时,分子磁矩减小和超交换作用减弱导致材料的饱和磁化强度和居里温度下降。在Zn-Ti取代量x=0.35、烧结温度为890℃的条件下,获得了高饱和磁化强度(约3913 G)、高居里温度(约304℃)、低铁磁共振线宽(约97 Oe)、低介电损耗(损耗正切约3.82×10^(-4))的材料。

Li_(0.42)Zn_(x)Ti_(x-0.16)Fe_(2.637-2x)Mn_(0.1)Bi_(0.003)O_(4)(LiZnTiMn ferrite,x=0.16-0.50)was synthesized by solid state reaction method.The phase composition,microstructure and gyromagnetic properties of the material were analyzed.The single spinel structure was obtained for sample sintered at 890℃.Zn-Ti substitution can promote sintering,and change the magnetocrystalline anisotropy constant and Fe^(2+) ion content of materials,thus reducing the ferromagnetic resonance linewidth and dielectric loss of.Meanwhile,the saturation magnetization and Curie temperature decrease due to the decrease of molecular magnetic moment and the weakening of superexchange.Under the conditions of Zn-Ti substitution x=0.35 and sintering temperature of 890℃,the materials with high saturation magnetization(about 3913 G),high Curie temperature(about 304℃),low ferromagnetic resonance linewidth(about 97 Oe)and low dielectric loss(tanδ_(ε) of about 3.82×10^(−4))were obtained.