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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Effect of Reduced Particle Size on the Magnetic Properties of Chemically Synthesized BiFeO3 Nanocrystals
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Effect of Reduced Particle Size on the Magnetic Properties of Chemically Synthesized BiFeO3 Nanocrystals

机译：降低粒径对化学合成BifeO3纳米晶体磁性的影响

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摘要

Here, we report the effect of reduction in particle size on the temperature dependent magnetization of chemically synthesized BiFeO3 nanocrystals with average grain size of 55 nm. The X-ray photoelectron spectroscopy results show a significant broadening of binding energy peaks associated to Fe~(3+) 2p_(3/2) core levels due to the reduced size. Additionally, due to the nanosize effect, the M-H loops show a significant coercivity starting from 390 K with an anomaly located in the vicinity of 150 K in our H_c vs T as well as M_r/M_(s(50 kOe)) vs T curves. At this temperature, both H_c and M_r/M_(s(50 kOe)) undergo minima. Additionally, our results for the first time show the evidence of existence of a low temperature anomaly due to spin-glass transition in the range from 40-44 K in the field cooled magnetization curves. In bulk single crystals, this transition is reported to be situated at around 50 K, however, this transition remained so far undiscovered in the recent studies on BiFeO3 nanoparticles due to the insufficient temperature resolution. The significant shift in this transition toward lower temperature can be attributed to size dependent effects. Our results clearly present new information on the size dependent properties of BiFeO3 nanoparticles.
机译：在这里，我们报告了粒度降低对化学合成的BIFEO3纳米晶体的温度依赖性磁化，平均晶粒尺寸为55nm的效果。 X射线光电子能谱结果显示出由于尺寸减小而与Fe〜（3+）2P_（3/2）核心水平相关的结合能峰的显着扩展。另外，由于纳米化效果，MH环的显着矫顽力从390 k开始，在我们的H_C VS T的150 k附近的异常以及M_R / M_（S（50只koe））Vs曲线。在该温度下，H_C和M_R / M_（S（50只KOE））经过最小值。此外，我们首次的结果表明，由于场冷磁化曲线中40-44k的范围内的旋转玻璃过渡，所以存在低温异常的证据。在散装单晶中，据报道该转变为位于50克约50克，然而，这仍然是由于温度分辨率不足的BifeO3纳米颗粒的最近研究中未被发现。这种转变对较低温度的显着变化可归因于尺寸依赖性效果。我们的结果清楚地提出了关于BifeO3纳米颗粒的大小依赖性性质的新信息。

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