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首页> 外文期刊>IEEE Transactions on Magnetics >Structure and Magnetic Properties of ${hbox{Ba}}_{1hbox{-}{rm x}}{hbox{La}}_{rm x}{hbox{Fe}}_{12}{hbox{O}}_{19}$ Prepared by ${hbox{Ba}}_{1hbox{-}{rm x}}{hbox{La}}_{rm x}{hbox{Fe}}_{2}{hbox{O}}_{4}$
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Structure and Magnetic Properties of ${hbox{Ba}}_{1hbox{-}{rm x}}{hbox{La}}_{rm x}{hbox{Fe}}_{12}{hbox{O}}_{19}$ Prepared by ${hbox{Ba}}_{1hbox{-}{rm x}}{hbox{La}}_{rm x}{hbox{Fe}}_{2}{hbox{O}}_{4}$

机译：$ {hbox {Ba}} _ {1hbox {-} {rm x}} {hbox {La}} _ {rm x} {hbox {Fe}} _ {12} {hbox {O}}的结构和磁性_ {19} $由$ {hbox {Ba}} _ {1hbox {-} {rm x}} {hbox {La}} _ {rm x} {hbox {Fe}} _ {2} {hbox {O }} _ {4} $

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摘要

M-type Barium hexaferrite (${hbox{BaFe}}_{12}{hbox{O}}_{19}$ ) with substitution of ${hbox{Ba}}^{2+}$ by rare earth metal ${hbox{La}}^{3+}$ were prepared by solid state synthesis method from as-prepared powder of barium monoferrite (${hbox{Ba}}_{1hbox{-}{rm x}}{hbox{La}}_{rm x}{hbox{Fe}}_{2}{hbox{O}}_{4}$) (${rm x}=$0.0, 0.1 and 0.2). The structural and magnetic properties of ${hbox{Ba}}_{1hbox{-}{rm x}}{hbox{La}}_{rm x}{hbox{Fe}}_{12}{hbox{O}}_{19}$ were investigated by X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and Mössbauer spectroscopy. The refined XRD patterns suggests the formation of single phase hexaferrite. With increased La substitution (x), the saturation magnetization increased and reached maximum at ${rm x}=0.1$ and decreased at ${rm x}=0.2$ , without any noticeable change in coercivity. Fitted Mössbauer spectra of ${hbox{Ba}}_{1hbox{-}{rm x}}{hbox{La}}_{rm x}{hbox{Fe}}_{12}{hbox{O}}_{19}$ showed increase in hyperfine field and a transition from ${hbox{Fe}}^{3+}$ ion to ${hbox{Fe}}^{2+}$ ion at $2b$ site. The present work demonstrates a new methodology for two stage substitution.
机译：M型钡铁氧体（$ {hbox {BaFe}} _ {12} {hbox {O}} _ {19} $）被稀土金属$$ {hbox {Ba}} ^ {2 +} $替代{{hbox {La}} ^ {3 +} $是通过固态合成方法从钡铁氧体（$ {hbox {Ba}} _ {1hbox {-} {rm x}} {hbox {La }} _ {rm x} {hbox {Fe}} _ {2} {hbox {O}} _ {4} $）（$ {rm x} = $ 0.0、0.1和0.2）。 $ {hbox {Ba}} _ {1hbox {-} {rm x}} {hbox {La}} _ {rm x} {hbox {Fe}} _ {12} {hbox {O}的结构和磁性} _ {19} $通过X射线衍射（XRD），振动样品磁力计（VSM）和Mössbauer光谱学进行了研究。精制的XRD图谱表明形成了单相六铁氧体。随着La置换（x）的增加，饱和磁化强度在$ {rm x} = 0.1 $处增大并达到最大值，而在$ {rm x} = 0.2 $处减小，而矫顽力没有明显变化。 $ {hbox {Ba}} _ {1hbox {-} {rm x}} {hbox {La}} _ {rm x} {hbox {Fe}} __ {12} {hbox {O}} _的拟合Mössbauer谱{19} $显示超精细场的增加，并且在$ 2b $位置从$ {hbox {Fe}} ^ {3 +} $离子过渡到$ {hbox {Fe}} ^ {2 +} $离子。本工作展示了一种用于两阶段替代的新方法。

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