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首页> 外文期刊>Physica, B. Condensed Matter >The effect of Ni substitution on magnetic, dielectric and magnetoelectric properties in BiFe_(1-x)Ni_xO_3 system
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The effect of Ni substitution on magnetic, dielectric and magnetoelectric properties in BiFe_(1-x)Ni_xO_3 system

机译：Ni替代对BiFe_（1-x）Ni_xO_3体系的磁，介电和磁电性能的影响

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摘要

Multiferroic nanoceramics BiFe_(1-x)Ni_xO_3 (where x=0, 0.15, 0.20, and 0.25) were prepared by the solgel method. XRD analysis of samples calcined at a low temperature of 400 °C for 2 h shows the formation of a single phase perovskite rhombohedral structure. Average particle size was observed to be ～50 nm by TEM measurement. Magnetization was found to increase with increase in the concentration of Ni. Dielectric constant and dielectric loss were measured up to 1 MHz frequency. Variation of dielectric constant with temperature shows a peak at ～395 °C (Neel temperature) for x=0.15 and the peak shifts towards lower temperature at a higher concentration of Ni with diffused type of phase transition. Magnetocapacitance was found to decrease with magnetic field. For BiFe _(1-x)Ni_xO_3 (with x=0.15, 0.20, 0.25) nanoceramics, the fractional change of the magnetic field induced a change in the dielectric constant, which may well be approximated by Δε/ε= γM~2, (where γ (magnetoelectric interaction) is small and negative). A linear fit gave the value of γ of ～-2.14×10 ~(-3), -2.11×10~(-3), and -2.09×10~(-3) for BiFe_(1-x)Ni_xO_3 nanoceramics, with x=0.15, 0.20, and 0.25, respectively.
机译：通过溶胶凝胶法制备多铁纳米陶瓷BiFe_（1-x）Ni_xO_3（其中x ＝ 0、0.15、0.20和0.25）。在400°C的低温下煅烧2 h的样品的XRD分析表明，形成了单相钙钛矿菱面体结构。通过TEM测量观察到平均粒径为〜50nm。发现磁化随着Ni浓度的增加而增加。在高达1 MHz的频率下测量介电常数和介电损耗。介电常数随温度的变化在x = 0.15时在〜395°C（Neel温度）处出现一个峰，并且当Ni的浓度较高时，该峰向较低温度移动，具有扩散型相变。发现磁电容随磁场而降低。对于BiFe _（1-x）Ni_xO_3（x = 0.15，0.20，0.25）纳米陶瓷，磁场的分数变化引起介电常数的变化，可以很好地近似为Δε/ε=γM〜2， （其中γ（磁电相互作用）较小且为负）。对于BiFe_（1-x）Ni_xO_3纳米陶瓷，线性拟合得出的γ值为〜-2.14×10〜（-3），-2.11×10〜（-3）和-2.09×10〜（-3）， x分别为0.15、0.20和0.25。

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