Correlation between the structural phase transition and magnetic properties of sol-gel synthesized nanoparticles

IF 1.8 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

EPL Pub Date : 2024-07-10 DOI:10.1209/0295-5075/ad5908

Swati Jharwal, Vivek Kumar Verma and Arvind Kumar

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Abstract

The La2CoFeO6 (LCFO) nanoparticles were synthesized using the sol-gel method and calcined at 600 , 800 , and 1000 . The X-ray diffraction data confirm the successful formation of LCFO nanoparticles. The crystallite size was observed to increase from ∼13 nm to ∼26 nm as the calcination temperature rose. Detailed Rietveld analysis revealed the coexistence of both orthorhombic (Pnma: S.G. 62) and rhombohedral ( : S.G. 167) phases in the LCFO samples. A two-phase Rietveld refinement demonstrated a structural phase transition (from Pnma to ) as the calcination temperature increased. FESEM micrographs exhibited a granular morphology for the LCFO nanoparticles, and the grain size was observed to increase with the elevated calcination temperature. Magnetization curves illustrated an increase in magnetization with a decrease in crystallite size or a reduction in calcination temperature for LCFO nanoparticles. At higher calcination temperatures, the rhombohedral phase displayed significant antisite disorder, resulting in the disruption of long-range ferromagnetic ordering in the material and a subsequent decrease in maximum magnetization.

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溶胶凝胶合成纳米粒子的结构相变与磁性之间的相关性

采用溶胶-凝胶法合成了 La2CoFeO6（LCFO）纳米粒子，并在 600、800 和 1000 °C 下煅烧。X 射线衍射数据证实了 LCFO 纳米粒子的成功形成。据观察，随着煅烧温度的升高，晶体尺寸从 ∼13 nm 增加到 ∼26 nm。详细的里特维尔德分析表明，LCFO 样品中同时存在正方体（Pnma：S.G. 62）和斜方体（：S.G. 167）两相。两相 Rietveld 精炼显示，随着煅烧温度的升高，结构相发生了转变（从 Pnma 到）。FESEM 显微照片显示 LCFO 纳米颗粒呈颗粒状形态，并且观察到晶粒尺寸随着煅烧温度的升高而增大。磁化曲线显示，LCFO 纳米粒子的磁化率随着晶体尺寸的减小或煅烧温度的降低而增加。在较高的煅烧温度下，斜方体相显示出明显的反斜方体无序，导致材料中的长程铁磁有序被破坏，最大磁化率随之降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

EPL 物理-物理：综合

CiteScore

3.30

自引率

5.60%

发文量

332

审稿时长

1.9 months

期刊介绍： General physics – physics of elementary particles and fields – nuclear physics – atomic, molecular and optical physics – classical areas of phenomenology – physics of gases, plasmas and electrical discharges – condensed matter – cross-disciplinary physics and related areas of science and technology. Letters submitted to EPL should contain new results, ideas, concepts, experimental methods, theoretical treatments, including those with application potential and be of broad interest and importance to one or several sections of the physics community. The presentation should satisfy the specialist, yet remain understandable to the researchers in other fields through a suitable, clearly written introduction and conclusion (if appropriate). EPL also publishes Comments on Letters previously published in the Journal.