Motivating electrical characteristics of La0.7(Sr5/6Na1/6)0.3MnO3 and possibility of its application as direct temperature switcher in electronic devices

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-07-01 DOI:10.1016/j.matchemphys.2025.131205

Y. Moualhi , Manal Alruwaili , Mona A. Alamri , Mansour Alhabradi , S. Elkossi , Hafedh Belmabrouk , H. Rahmouni

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引用次数: 0

Abstract

La₀_·₇(Sr_5/6Na_1/6)_0.3MnO₃ was synthesized via solid-state reaction and characterized using X-ray diffraction and impedance spectroscopy analysis. Rietveld refinement results confirm the rhombohedral structure of La₀_·₇(Sr_5/6Na_1/6)_0.3MnO₃. Microstructural analysis showed randomly shaped grains with an average size of ∼950 nm. Electrical DC-measurements revealed a metal-semiconductor transition at T_M-S = 240 K. The material behavior was attributed to adiabatic small polaron hopping above T_M-S and bandwidth competition coupled with size disorder effects for T < T_M-S. The conductivity spectra of La₀_·₇(Sr_5/6Na_1/6)_0.3MnO₃ disclose the coexistence of conduction and relaxation phenomena. Frequency-dependent conductivity indicated three distinct regimes involving Mn–Mn and Mn–O–Mn interactions. At low frequencies, a clear transition from metallic to semiconducting behavior is observed at T_M-S, indicating a shift from delocalized Mn–Mn to localized Mn–O–Mn interactions. In the intermediate frequency range, a transition from mixed Mn–Mn/Mn–O–Mn states to dominant Mn–O–Mn interactions was observed. At high frequencies, Mn–O–Mn interactions prevail, accompanied by the appearance of hopping conduction across the studied temperature range. These results highlight the material's complex transport mechanisms and potential for switching device applications.

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La0.7(Sr5/6Na1/6)0.3MnO3的激励电学特性及其在电子器件中用作直接温度开关的可能性

采用固相反应合成La0·7(Sr5/6Na1/6)0.3MnO3，并用x射线衍射和阻抗谱分析对其进行了表征。Rietveld细化结果证实了La0·7(Sr5/6Na1/6)0.3MnO3的菱形结构。显微结构分析显示晶粒形状随机，平均尺寸为~ 950 nm。电直流电测量显示在TM-S = 240 K时发生了金属-半导体跃迁。材料行为归因于TM-S以上的绝热小极化子跳变和带宽竞争以及t<的尺寸紊乱效应；TM-S。La0·7(Sr5/6Na1/6)0.3MnO3的电导率谱揭示了导电和弛豫共存的现象。频率相关的电导率显示了三种不同的机制，涉及Mn-Mn和Mn-O-Mn相互作用。在低频，TM-S观察到从金属到半导体行为的明显转变，表明从离域Mn-Mn到局域Mn-O-Mn相互作用的转变。在中频范围内，观察到从混合Mn-Mn / Mn-O-Mn态到主导Mn-O-Mn相互作用的转变。在高频率下，Mn-O-Mn相互作用盛行，伴随着在研究温度范围内的跳变传导的出现。这些结果突出了材料的复杂传输机制和开关器件应用的潜力。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.