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对CuWO和α-CuMoO化合物的结构、热性能和电导率特性进行研究以了解其传输机制。

An investigation of structural, thermal, and electrical conductivity properties for understanding transport mechanisms of CuWO and α-CuMoO compounds.

作者信息

Chakchouk N, Karoui K, Drissi N, Jomni F, Ben Rhaiem A

机构信息

University of Sfax, Laboratory of Spectroscopic Characterization and Optics of Materials, Faculty of Sciences BP 1171 3000 Sfax Tunisia

GREMAN UMR 7347-CNRS, CEA, INSACVL, University of Tours Blois France.

出版信息

RSC Adv. 2024 Jan 2;14(1):46-58. doi: 10.1039/d3ra07453f.

DOI:10.1039/d3ra07453f
PMID:38173573
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10758763/
Abstract

Recently, inorganic oxide components with high ionic conductivity have been widely explored due to their high stability, safety, and energy density properties. In this context, the present work focuses on the inorganic oxides CuMO (M = W, Mo), which have been successfully synthesized using the traditional solid-state method. They were characterized by X-ray powder diffraction, thermal analysis, and complex impedance spectroscopy. X-ray diffraction data refined the Rietveld method indicated that these compounds are well crystallized in the triclinic system with the 1̄ space group. Besides, the electrical conductivity behavior of these materials was analyzed using the impedance spectroscopy technique in the frequency range of 10 to 10 Hz and in the temperature range of 443 K to 563 K. The absence of a phase transition observed in the calorimetric study was confirmed by the and variations as a function of temperature. The AC conductivity was analyzed by Jonscher's power law. The outcomes of the study on charge transportation in CuMO (where M = W, Mo) suggest that the overlapping large polaron tunneling (OLPT) mechanism was present in CuMoO, while the correlated barrier hopping (CBH) and the non-overlapping small polaron tunneling (NSPT) were present in CuWO. A correlation between the crystal structure and the ionic conductivity was established and discussed. For the two title compounds, modulus analysis revealed that the charge carriers were mobile over short and long distances at low and high frequencies, respectively. The temperature variation of the M'' peak showed a thermally activated relaxation process.

摘要

最近，具有高离子电导率的无机氧化物组分因其高稳定性、安全性和能量密度特性而受到广泛探索。在此背景下，本工作聚焦于无机氧化物CuMO（M = W，Mo），它们已通过传统固态方法成功合成。通过X射线粉末衍射、热分析和复阻抗谱对其进行了表征。用Rietveld方法精修的X射线衍射数据表明，这些化合物在三斜晶系中具有(1̄)空间群，结晶良好。此外，使用阻抗谱技术在10至(10^6)Hz的频率范围和443K至563K的温度范围内分析了这些材料的电导率行为。量热研究中未观察到相变，这通过(\cdots)和(\cdots)随温度的变化得到证实。通过琼舍尔幂律分析了交流电导率。对CuMO（其中M = W，Mo）中电荷传输的研究结果表明，CuMoO中存在重叠大极化子隧穿（OLPT）机制，而CuWO中存在相关势垒跳跃（CBH）和非重叠小极化子隧穿（NSPT）。建立并讨论了晶体结构与离子电导率之间的相关性。对于这两种标题化合物，模量分析表明，电荷载流子分别在低频和高频下在短距离和长距离上可移动。M''峰的温度变化显示出热激活弛豫过程。

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