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磁铁矿FeO纳米颗粒中不寻常的半导体-金属-半导体转变

Unusual semiconductor-metal-semiconductor transitions in magnetite FeO nanoparticles.

作者信息

Rehman Atta Ur, Atif M, Younas M, Rafique T, Wahab H, Ul-Hamid A, Iqbal N, Ali Z, Khalid W, Nadeem M

机构信息

Functional Materials Lab, Department of Physics, Air University PAF Complex E-9 Islamabad Pakistan

Polymer Composite Group, Physics Division, Directorate of Science, PINSTECH P.O. Nilore Islamabad Pakistan.

出版信息

RSC Adv. 2022 Apr 25;12(20):12344-12354. doi: 10.1039/d2ra00530a. eCollection 2022 Apr 22.

DOI:10.1039/d2ra00530a
PMID:35480359
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9036052/
Abstract

Magnetite (FeO) nanoparticles were successfully prepared by a co-precipitation method. Rietveld refinement on the X-ray diffraction pattern confirmed the development of a single-phase cubic spinel structure with space group 3̄. However, Fe Mössbauer spectroscopy suggested the presence of Fe and Fe (mixed Fe and Fe) ions at the tetrahedral and octahedral sites of the inverse spinel structure, respectively. Impedance spectroscopy measurements showed a discontinues variation in the temperature dependence of the sample's resistive behavior, indicating the appearance of semiconductor-metal-semiconductor like transitions between the temperature range of 293 and 373 K. A similar dual transition was also observed from the dielectric and conductivity measurements around the same temperature regions. The observed unusual transition is explained in term of the competitive effects among the hopping of localized/delocalized and short-range/long-range charge carriers present in the sample. Moreover, the prepared sample exhibits colossal dielectric permittivity (∼10), reduced tangent loss (∼0.2) and moderate conductivity (>10 S cm) values, making FeO nanoparticles a potential candidate for electromagnetic absorbing materials.

摘要

通过共沉淀法成功制备了磁铁矿（FeO）纳米颗粒。对X射线衍射图谱进行的Rietveld精修证实了具有空间群3̄的单相立方尖晶石结构的形成。然而，Fe穆斯堡尔光谱表明，在反尖晶石结构的四面体和八面体位点分别存在Fe和Fe（Fe和Fe混合）离子。阻抗谱测量显示，样品电阻行为的温度依赖性存在不连续变化，表明在293至373 K的温度范围内出现了类似半导体-金属-半导体的转变。在相同温度区域附近的介电和电导率测量中也观察到了类似的双重转变。观察到的异常转变是根据样品中存在的局域/非局域和短程/长程电荷载流子跳跃之间的竞争效应来解释的。此外，所制备的样品表现出巨大的介电常数（10）、降低的损耗角正切（0.2）和适度的电导率（>10 S cm）值，使得FeO纳米颗粒成为电磁吸收材料的潜在候选者。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/cf45c1130087/d2ra00530a-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/a237dd967f0f/d2ra00530a-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/25a1cbf5b1f3/d2ra00530a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/b398bb33ccfa/d2ra00530a-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/2ea065db7aa7/d2ra00530a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/f18d1a603f0d/d2ra00530a-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/80bfdfea89af/d2ra00530a-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/cf45c1130087/d2ra00530a-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/a237dd967f0f/d2ra00530a-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/6f2d5b1c1f3e/d2ra00530a-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/beb3dea162b3/d2ra00530a-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/25a1cbf5b1f3/d2ra00530a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/b398bb33ccfa/d2ra00530a-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/2ea065db7aa7/d2ra00530a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/f18d1a603f0d/d2ra00530a-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/80bfdfea89af/d2ra00530a-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3d05/9036052/cf45c1130087/d2ra00530a-f9.jpg

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