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用于电气应用的LaSmSrMnCrO的结构、电学和介电性能研究。

Investigation of the structural, electrical, and dielectric properties of LaSmSrMn Cr O for electrical application.

作者信息

Abdouli Khouloud, Hassini F, Cherif W, Prezas P R, Graça M P F, Valent M A, Messaoudi O, Elgharbi S, Dhahri Ahmed, Manai L

机构信息

Sfax University, Faculty of Sciences B. P. 1171 3000 Tunisia.

Research Unit of Valorization and Optimization of Exploitation of Resources, Faculty of Science and Technology of Sidi Bouzid, Kairouan University 9100 Sidi Bouzid Tunisia.

出版信息

RSC Adv. 2022 Jun 7;12(26):16805-16822. doi: 10.1039/d2ra01006b. eCollection 2022 Jun 1.

DOI:10.1039/d2ra01006b
PMID:35754884
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9171900/
Abstract

In the present research, polycrystalline samples of LaSmSrMn Cr O are prepared using the self-combustion method. Then, we have studied their crystalline structure, and dielectric and electrical properties. The X-ray diffraction study shows that all the samples exhibit a single phase with orthorhombic structure (space group ). The studied samples were also characterized by complex impedance spectroscopy in a wide range of temperatures and frequency. AC conductivity analyses are used to study the transport property of the investigated samples. These analyses indicate that the conduction mechanism is strongly dependent on temperature and frequency. It is also found that the conductivity decreases with Cr concentration. Complex impedance analysis confirms the contributions of grain and grain boundaries in the conduction mechanism. Finally, the impedance spectra, characterized by the appearance of semicircle arcs at different temperatures, were well modeled in terms of equivalent electrical circuits to explain the impedance results.

摘要

在本研究中，采用自燃烧法制备了LaSmSrMnCrO的多晶样品。然后，我们研究了它们的晶体结构、介电和电学性质。X射线衍射研究表明，所有样品均呈现具有正交结构（空间群）的单相。所研究的样品还通过在宽温度和频率范围内的复阻抗谱进行了表征。交流电导率分析用于研究被研究样品的传输性质。这些分析表明，传导机制强烈依赖于温度和频率。还发现电导率随Cr浓度的增加而降低。复阻抗分析证实了晶粒和晶界在传导机制中的贡献。最后，以不同温度下出现半圆弧形为特征的阻抗谱，通过等效电路进行了很好的建模，以解释阻抗结果。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/0c5f563e5d58/d2ra01006b-f12.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/255b418058fc/d2ra01006b-f8.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/a2523a037d99/d2ra01006b-f11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/0c5f563e5d58/d2ra01006b-f12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/0fe651308cf9/d2ra01006b-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/b4aa66e21304/d2ra01006b-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/1b4ea1c5997c/d2ra01006b-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/9a84e849c231/d2ra01006b-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/fbd0cc577799/d2ra01006b-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/c12963026e29/d2ra01006b-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/090f96f26212/d2ra01006b-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/255b418058fc/d2ra01006b-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/026807ac936b/d2ra01006b-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/0a34a2706557/d2ra01006b-f10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/a2523a037d99/d2ra01006b-f11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4fc9/9171900/0c5f563e5d58/d2ra01006b-f12.jpg

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Limiting behavior of ac conductivity in ionically conducting crystals and glasses: A new universality.离子导电晶体和玻璃中交流电导率的极限行为：一种新的普适性。
Phys Rev Lett. 1991 Sep 16;67(12):1559-1561. doi: 10.1103/PhysRevLett.67.1559.
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钒酸铋玻璃半导体中的频率依赖电导率。
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