金属铁诱导复相铁氧体材料的制备和磁性能
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摘要
六角铁氧体是一种广泛应用在微波信号处理领域的重要材料,如何大幅度调控饱和磁化强度和矫顽力一直是此类材料研究的重点。本文以金属铁作为诱发剂、采用放电等离子体烧结(SPS)技术制备了一系列饱和磁化强度和矫顽力均可大幅度调控的M型、W型和Z型钡铁氧体诱变复相铁氧体材料,重点研究了复相铁氧体的物相组成、结晶反应机制、显微结构和磁性能。
通过优化SPS烧结的温度、保温时间和压力,确定了制备M型钡铁氧体(BaM)诱变复相铁氧体材料的优化SPS工艺为900℃、保温30 min和压力20MPa。利用该工艺,以名义组成为xFe+BaFe_(12)O_(19)(0≤x≤1.0,△x=0.1)的共沉淀前驱体制备了BaM诱变复相铁氧体材料。0 在900℃、保温30 min和20 MPa的SPS条件下,分别用金属铁粉与单相BaM、BaCo_2Fe_(16)O_(27)(Co_2W)和Ba_3Co_2Fe_(24)O_(41)(Co_2Z)粉体构成的xFe+BaFe_(12)O_(19)、xFe+BaCo_2Fe_(16)O_(27)和xFe+Ba_3Co_2Fe_(24)O_(41)(0≤x≤1.0,△x=0.1)的均匀混合物制备了系列M型、W型和Z型钡铁氧体诱变复相铁氧体材料。
BaM诱变复相铁氧体随x增加其晶粒尺寸、瓯和皿逐渐减小但致密度逐渐增大,物相组成为BaM、Fe_3O_4和Fe_2Y时结晶反应为BaM与Fe生成Fe_2Y和Fe_3O_4,为Fe_3O_4、Fe_2Y和BaFe_2O_4时结晶反应为BaM与Fe生成Fe_2Y和Fe_3O_4,Fe与Fe_2Y生成BaFe_2O_4和Fe_3O_4;CO_2W诱变复相铁氧体随x增加其致密度逐渐增大、σ_s逐渐降低、H_c先增大后降低,物相组成为Co_2W、Ba_2Co_2Fe_(12)O_(22)(Co_2Y)、CoFe_2O_4和Fe_3O_4时结晶反应为Co_2W与Fe生成Co_2Y、CoFe_2O_4和Fe_3O_4,为BaFe_2O_4、Fe_3O_4、CoFe_2O_4和Co_2Y时结晶反应为Co_2W与Fe生成CoFe_2O_4、Co_2Y和Fe_3O_4,Fe与Co_2Y生成BaFe_2O_4、Fe_3O_4和CoFe_2O_4;Co_2Z诱变复相铁氧体随x增加其致密度和H_c增大、σ_s降低,物相组成由Co_2Z、Fe_3O_4、BaFe_2O_4和Co_2Y组成,但x=1.0时Co_2Z消失,结晶反应为Co_2Z与Fe生成Co_2Y、Fe_3O_4和BaFe_2O_4。
The hexaferrite is an important material which is widely used in microwave processing, and how to regulate the saturation magnetization and the coercivity of the hexaferrite in large range is a significant research topic in preparing this microwave processing materials, In this paper, spark plasma sintering (SPS) technique was used to synthesize a series of M-type, W-type and Z-type barium ferrites induced multiphase ferrite mateials in large range to regulate saturation magnetizations and coercivities with metal iron as an induced agent. The phase composition, crystallization reaction mechanism, microsturcture and magnetic properties of the multiphase ferrite materials were comprehensively studied.
By regulating the SPS sintering temperature, holding time and pressure, the optimized condition is holding 30 min at 900℃and 20 MPa for synthesizing M-type barium ferrite (BaM) induced multiphase ferrite materials. M-type barium ferrite induced multiphase ferrite materials were synthesized by sintering the coprecipitation precursors with nominal composition of xFe + BaFe_(12)O_(19)(0≤x≤1,△x=0.1) under the optimized SPS condition. The multiphase ferrite mat1erials were composed of BaM, Fe_3O_4 and Ba_2Fe_(14)O_(22) (Fe_2Y) for 0 A series of M-type, W-type and Z-type barium ferrite induced multiphase ferrite materials fabricated by sintering the mixtures of irons and single phase BaM, BaCo_2Fe_(16)O_(27) (Co_2W) and Ba_3Co_2Fe_(24)O_(41) (Co_2Z) powders with nominal composition of xFe+BaFe_(12)O_(19), xFe + BaCo_2Fe_(16)O_(27) and xFe + Ba_3Co_2Fe_(24)O_(41) (0≤x≤1,△x=0.1) using SPS method at 900℃and 20 MPa holding for 30 min, respectively.
To the M-type barium ferrite induced multiphase ferrite materials, the grain size, the saturation magnetization and the coercivity reduced gradually, but the density increased with the x increasing. The crystallization reaction is BaM and Fe to form Fe_2Y and Fe_3O_4, when multiphase ferrite materials were composed of BaM, Fe_3O_4 and Fe_2Y; the crystallization reaction are BaM and Fe to form Fe_2Y and Fe_3O_4, Fe and Fe_2Y to form BaFe_2O_4 and Fe_3O_4, when the multiphase ferrite materials were composed of Fe_3O_4, Fe_2Y and BaFe_2O_4. To the W-type barium ferrite induced multiphase ferrite materials, the density increased, the saturation magnetization reduced and the coercivity increased and then reduced with the x increasing. The crystallization reaction is Co_2W and Fe to form Ba_2Co_2Fe_(12)O_(22)(Co_2Y), CoFe_2O_4 and Fe_3O_4 when multiphase ferrite materials were composed of Co_2W, Fe_3O_4, Co_2Y and CoFe_2O_4; the crystallization reaction are Co_2W and Fe to form Co_2Y, CoFe_2O_4 and Fe_3O_4, Fe and Co_2Y to form BaFe_2O_4, Fe_3O_4 and CoFe_2O_4 when the multiphase ferrite materials were composed of Fe_3O_4, Co_2Y, BaFe_2O_4 and CoFe_2O_4. To the Z-type barium ferrite induced multiphase ferrite materials, the density and the coercivity increased but the saturation magnetization reduced with the x increasing. The multiphase ferrite materials were composed of Co_2Z, Fe_3O_4, BaFe_2O_4 and Co_2Y, the Co_2Z disappeared with x=1.0. The crystallization reaction mechanism is Co_2Z and Fe to form Co_2Y, Fe_3O_4 and BaFe_2O_4.
通过优化SPS烧结的温度、保温时间和压力,确定了制备M型钡铁氧体(BaM)诱变复相铁氧体材料的优化SPS工艺为900℃、保温30 min和压力20MPa。利用该工艺,以名义组成为xFe+BaFe_(12)O_(19)(0≤x≤1.0,△x=0.1)的共沉淀前驱体制备了BaM诱变复相铁氧体材料。0
BaM诱变复相铁氧体随x增加其晶粒尺寸、瓯和皿逐渐减小但致密度逐渐增大,物相组成为BaM、Fe_3O_4和Fe_2Y时结晶反应为BaM与Fe生成Fe_2Y和Fe_3O_4,为Fe_3O_4、Fe_2Y和BaFe_2O_4时结晶反应为BaM与Fe生成Fe_2Y和Fe_3O_4,Fe与Fe_2Y生成BaFe_2O_4和Fe_3O_4;CO_2W诱变复相铁氧体随x增加其致密度逐渐增大、σ_s逐渐降低、H_c先增大后降低,物相组成为Co_2W、Ba_2Co_2Fe_(12)O_(22)(Co_2Y)、CoFe_2O_4和Fe_3O_4时结晶反应为Co_2W与Fe生成Co_2Y、CoFe_2O_4和Fe_3O_4,为BaFe_2O_4、Fe_3O_4、CoFe_2O_4和Co_2Y时结晶反应为Co_2W与Fe生成CoFe_2O_4、Co_2Y和Fe_3O_4,Fe与Co_2Y生成BaFe_2O_4、Fe_3O_4和CoFe_2O_4;Co_2Z诱变复相铁氧体随x增加其致密度和H_c增大、σ_s降低,物相组成由Co_2Z、Fe_3O_4、BaFe_2O_4和Co_2Y组成,但x=1.0时Co_2Z消失,结晶反应为Co_2Z与Fe生成Co_2Y、Fe_3O_4和BaFe_2O_4。
The hexaferrite is an important material which is widely used in microwave processing, and how to regulate the saturation magnetization and the coercivity of the hexaferrite in large range is a significant research topic in preparing this microwave processing materials, In this paper, spark plasma sintering (SPS) technique was used to synthesize a series of M-type, W-type and Z-type barium ferrites induced multiphase ferrite mateials in large range to regulate saturation magnetizations and coercivities with metal iron as an induced agent. The phase composition, crystallization reaction mechanism, microsturcture and magnetic properties of the multiphase ferrite materials were comprehensively studied.
By regulating the SPS sintering temperature, holding time and pressure, the optimized condition is holding 30 min at 900℃and 20 MPa for synthesizing M-type barium ferrite (BaM) induced multiphase ferrite materials. M-type barium ferrite induced multiphase ferrite materials were synthesized by sintering the coprecipitation precursors with nominal composition of xFe + BaFe_(12)O_(19)(0≤x≤1,△x=0.1) under the optimized SPS condition. The multiphase ferrite mat1erials were composed of BaM, Fe_3O_4 and Ba_2Fe_(14)O_(22) (Fe_2Y) for 0
To the M-type barium ferrite induced multiphase ferrite materials, the grain size, the saturation magnetization and the coercivity reduced gradually, but the density increased with the x increasing. The crystallization reaction is BaM and Fe to form Fe_2Y and Fe_3O_4, when multiphase ferrite materials were composed of BaM, Fe_3O_4 and Fe_2Y; the crystallization reaction are BaM and Fe to form Fe_2Y and Fe_3O_4, Fe and Fe_2Y to form BaFe_2O_4 and Fe_3O_4, when the multiphase ferrite materials were composed of Fe_3O_4, Fe_2Y and BaFe_2O_4. To the W-type barium ferrite induced multiphase ferrite materials, the density increased, the saturation magnetization reduced and the coercivity increased and then reduced with the x increasing. The crystallization reaction is Co_2W and Fe to form Ba_2Co_2Fe_(12)O_(22)(Co_2Y), CoFe_2O_4 and Fe_3O_4 when multiphase ferrite materials were composed of Co_2W, Fe_3O_4, Co_2Y and CoFe_2O_4; the crystallization reaction are Co_2W and Fe to form Co_2Y, CoFe_2O_4 and Fe_3O_4, Fe and Co_2Y to form BaFe_2O_4, Fe_3O_4 and CoFe_2O_4 when the multiphase ferrite materials were composed of Fe_3O_4, Co_2Y, BaFe_2O_4 and CoFe_2O_4. To the Z-type barium ferrite induced multiphase ferrite materials, the density and the coercivity increased but the saturation magnetization reduced with the x increasing. The multiphase ferrite materials were composed of Co_2Z, Fe_3O_4, BaFe_2O_4 and Co_2Y, the Co_2Z disappeared with x=1.0. The crystallization reaction mechanism is Co_2Z and Fe to form Co_2Y, Fe_3O_4 and BaFe_2O_4.
引文
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