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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Influence of Al3+ doping on structural and magnetic properties of CoFe2-xAlxO4 Ferrite nanoparticles
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Influence of Al3+ doping on structural and magnetic properties of CoFe2-xAlxO4 Ferrite nanoparticles

机译：Al3 +掺杂对CoFe2-xAlxO4铁氧体纳米颗粒结构和磁性的影响

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摘要

A series of Al3+ substituted CoFe2-xAlxO4 (x = 0.0 to 0.9) ferrite nanoparticles were synthesized via autocombustion method. XRD data show that all the samples exhibit single phase cubic spinel structure where the lattice parameter was observed to decrease linearly with increasing Al3+ content. Structurally Al3+ doping was observed to bring in grain refinement and increase dislocation density in CoFe2-xAlxO4. The magnetic parameters namely saturation magnetization, M-S, coercive field, H-C, and remanent magnetization, M-r vary significantly with Al3+ doping. The Al3+ doping resulted in reduction in Ms and Hc due to magnetic dilution effect and reduction in anisotropy constant K1, respectively. Room temperature Mossbauer spectra were analyzed to extract cation distribution and hyperfine parameters. The hyperfine magnetic field decreases at both tetrahedral (A) and octahedral (B) interstitial sites with the increase in Al3+ content. The Mossbauer spectral analysis reveals that Al3+ has preference for the tetrahedral A site and Co2+ prefers B sites. (C) 2016 Published by Elsevier B.V.
机译：通过自动燃烧法合成了一系列Al3 +取代的CoFe2-xAlxO4（x = 0.0至0.9）铁氧体纳米粒子。 XRD数据表明，所有样品均表现出单相立方尖晶石结构，其中观察到的晶格参数随Al3 +含量的增加而线性降低。在结构上观察到Al3 +掺杂可以使晶粒细化并增加CoFe2-xAlxO4中的位错密度。磁参数，即饱和磁化强度，M-S，矫顽场，H-C和剩余磁化强度，M-r随Al3 +掺杂而显着变化。 Al 3+掺杂分别由于磁稀释效应和各向异性常数K1的降低而导致Ms和Hc的降低。分析了室温的莫斯鲍尔光谱，以提取阳离子分布和超精细参数。随着Al3 +含量的增加，超细磁场在四面体（A）和八面体（B）间隙位置均减小。 Mossbauer光谱分析显示，Al3 +具有四面体A位点的优先权，而Co2 +具有B位点的优先权。 （C）2016由Elsevier B.V.发布

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