La1-xCsxMnO3 (0 ≤x ≤ 0.1) 陶瓷的合成、表征和磁性行为

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Chemistry and Physics Pub Date : 2024-11-19 DOI:10.1016/j.matchemphys.2024.130101

Marwa Lassoued , Silvana Mercone , Cécile Autret-Lambert , Mohamed Baazaoui , Mohamed Oumezzine , Eric Bourhis , Pascal Andreazza

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摘要

本文重点研究了 La1-xCsxMnO3（x = 0；0.05 和 0.1）锰矿中 La 位的铯掺杂效应。通过结构和磁性测量，对溶胶-凝胶自燃烧路线合成的粉末进行了表征。X 射线衍射（XRD）图的里特维尔德分析证实，所有样品都结晶成 R 3‾c 空间群的斜方晶体结构。随温度变化的衍射分析表明，影响 Jahn-Teller （J-T）畸变的结构参数呈线性变化。通过扫描电子显微镜（SEM）观察到了球形纳米颗粒。能量色散 X 射线光谱（EDS）分析证实了预期的 La、Cs、Mn 和 O 的存在比例，以及合成材料的相纯度。透射电子显微镜（TEM）证实了多晶体晶粒结构，从 TEM 中获得的晶粒大小在 21 nm 到 120 nm 之间，是成分和烧结温度的函数。高分辨率透射电子显微镜（HRTEM）图像中分辨出的晶格条纹证实了我们的化合物具有晶体斜方对称性。X 射线光电子能谱（XPS）研究证明了未掺杂和掺杂体系中锰离子（Mn4+ 和 Mn3+）的混合价态。电子自旋共振（ESR）分析证实了铁磁有序性随着掺杂铯的增加而降低。在所有 La1-xCsxMnO3（x = 0、0.05 和 0.1）样品中都观察到了软铁磁性，这可归因于磁性离子之间的超交换相互作用。令人惊讶的是，在低温（即 4K）下，磁化行为是铁磁性（FM）、超顺磁性（SPM）和顺磁性（PM）贡献的总和。不出所料，它们在室温下的行为是 PM。这项研究表明，少量的铯取代镧可以极大地影响结构和磁性能。

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Synthesis, characterization and magnetic behaviors of La1-xCsxMnO3 (0 ≤x ≤ 0.1) ceramics

In this paper, we focus on the Cs-doping effect at the La-site in La_1-xCs_xMnO₃ (x = 0; 0.05 and 0.1) manganite. Synthesized powders via the sol-gel auto-combustion route have been characterized by structural and magnetic measurements. All samples crystallize into a rhombohedral structure with R

\overline{3}

c space group as confirmed by Rietveld analysis of the X-ray diffraction (XRD) patterns. The diffraction analyses as function of temperature reveal a linear evolution of the structural parameters influencing the Jahn-Teller (J-T) distortion. Spherical nanoparticles have been observed by scanning electron microscopy (SEM). The energy-dispersive X-ray spectroscopy (EDS) analyses confirmed the expected presence of La, Cs, Mn and O ratio, as well as the phase purity of the synthesized materials. The polycrystalline grain structure was confirmed by transmission electron microscopy (TEM), where crystallite size obtained from TEM ranges from 21 nm to 120 nm as function of the composition and sintered temperature. The lattices fringes resolved in the high-resolution TEM (HRTEM) images confirmed the crystal rhombohedral symmetry of our compounds. X-ray photoelectron spectroscopy (XPS) studies demonstrate the mixed valence states of manganese ions (Mn⁴⁺ and Mn³⁺) in undoped as well as doped systems. The electron spin resonance (ESR) analyses confirmed the decreasing of the ferromagnetic ordering versus the increase of Cs doping. Soft ferromagnetism has been observed in all our La_1-xCs_xMnO₃ (x = 0; 0.05 and 0.1) samples which can be attributed to the super exchange interaction between the magnetic ions. Surprisingly enough, the magnetization behavior is found to be a sum of ferromagnetic (FM), superparamagnetic (SPM) and paramagnetic (PM) contributions at low temperature (i.e. 4K). As expected, their behavior is PM at room temperature. This work shows how structural and magnetic properties can be greatly affected by small amount of La-substitution by Cs.

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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.