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Correlation among local structure, magnetic, structural and electronic properties in polyol synthesized iron sulfide (FeS2) nanoparticles
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jallcom.2020.157977
J. Tripathi , G.S. Chandrawat , J. Singh , S. Tripathi , A. Sharma

Abstract A comparatively new and important cost and time effective Polyol method has been utilized for the preparation of FeS2nanoparticles (NPs), while their crystallite size, bonding as well as nearest neighbor atomic information was obtained from XRD, FTIR, Mossbauer, FE-SEM, EDX spectroscopy techniques. The average crystallite size was found to be ∼ 28 nm and a very small tangential strain due to the spherical shape of the particle was seen in the prepared sample. The bond length of Fe-S bond was estimated to be ∼ 0.29 nm and that of S-S bond was ∼0.22 nm using VESTA software confirming the Pyrite FeS2 structure in agreement with the XRD of these NPs. Also, the sample shows an octahedral geometry. Both XRD and Mossbauer spectra indicate that no impurity phase is present in these Pyrite NPs. Using Mossbauer, the average electric Quadrupole splitting (ΔEQ) and average isomer shift (δ), for Pyrite FeS2 at 300 K are found to be 0.596 ± 0.0039 mm/s and 0.311 ± 0.0023 mm/s respectively. From the Isomer shift, +2 oxidation state is confirmed. The FTIR revealed various vibrations modes of FeS2 nanoparticles (Fe=S, S-S and Fe-S bonds at their respective positions). Corresponding FE-SEM and EDX measurements revealed the formation of agglomerated spherical particles with the Fe:S ratio of ∼1:1.46 confirming the pyrite structure.

中文翻译:

多元醇合成硫化铁 (FeS2) 纳米粒子的局部结构、磁性、结构和电子特性之间的相关性

摘要 一种相对较新且重要的成本和时间有效的多元醇方法已被用于制备 FeS2 纳米颗粒 (NPs),而它们的微晶尺寸、键合以及最近邻原子信息是从 XRD、FTIR、Mossbauer、FE-SEM、 EDX 光谱技术。发现平均微晶尺寸约为 28 nm,并且在制备的样品中看到由于颗粒的球形形状而产生的非常小的切向应变。Fe-S 键的键长估计约为 0.29 nm,SS 键的键长约为 0.22 nm,使用 VESTA 软件确认黄铁矿 FeS2 结构与这些 NP 的 XRD 一致。此外,该示例还显示了八面体几何形状。XRD 和 Mossbauer 光谱均表明这些黄铁矿 NP 中不存在杂质相。使用 Mossbauer,发现黄铁矿 FeS2 在 300 K 下的平均电四极分裂 (ΔEQ) 和平均异构体位移 (δ) 分别为 0.596 ± 0.0039 mm/s 和 0.311 ± 0.0023 mm/s。从异构体位移,确认+2氧化态。FTIR 揭示了 FeS2 纳米粒子的各种振动模式(Fe=S、SS 和 Fe-S 键在它们各自的位置)。相应的 FE-SEM 和 EDX 测量结果表明形成了团聚的球形颗粒,其中 Fe:S 的比例约为 1:1.46,证实了黄铁矿结构。
更新日期:2020-11-01
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