Structural and Magnetic Properties of Nano Manganite La0.6Sr0.4MnO3 Obtained by Mechanochemical Synthesis Influenced by Preparation Conditions

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY ECS Journal of Solid State Science and Technology Pub Date : 2024-09-12 DOI:10.1149/2162-8777/ad775a

Peter N. G. Ibrahim, Ahmed E. Hannora and Farid F. Hanna

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Abstract

Single phase La0.6Sr0.4MnO3 nanoparticles with perovskite structure ( symmetry) were successfully prepared by ball milling (mechanochemical synthesis) for 1 and 10 h followed by annealing treatment at temperature 900 or 1100 °C. It was found that, the lattice parameters increase with the increase of milling time or annealing temperature. The increase of the annealing temperature results in the increase of crystallite size and the particle size. The obtained samples were found to be ferromagnetic at room temperature. The sample obtained by one hour of milling and 900 °C annealing showed high value of saturation magnetization (about 56 emu g−1) and small value of coercivity (about 31 Oe) at room temperature, while the other samples show reduced value of magnetization and higher value of coercivity. The obtained magnetic results are discussed in light of the core/shell model of nanoparticles. The effect of the presence of oxygen vacancies on the lattice parameters and magnetic properties of the obtained samples is also discussed. Highlights Single phase perovskite La0.6Sr0.4MnO3 was obtained by mechanochemical synthesis. The influence of milling time and annealing temperature on the structural and magnetic properties was studied. The lattice parameters increase with the increase of milling time or annealing temperature The crystallite size and the particle size increase with the increase of annealing temperature. All samples showed ferromagnetic behavior at room temperature. Most of the samples show reduced value of magnetization. The magnetic results were discussed by the core/shell model of nanoparticles. The formation of oxygen vacancies can affect the magnetic results.

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机械化学合成法获得的纳米锰矿 La0.6Sr0.4MnO3 的结构和磁性受制备条件的影响

通过球磨（机械化学合成）1 小时和 10 小时，然后在 900 或 1100 °C 温度下进行退火处理，成功制备了具有包晶结构（对称性）的单相 La0.6Sr0.4MnO3 纳米粒子。研究发现，晶格参数随研磨时间或退火温度的增加而增加。退火温度升高会导致晶体尺寸和颗粒尺寸增大。所获得的样品在室温下具有铁磁性。经过一小时研磨和 900 °C 退火处理的样品在室温下显示出较高的饱和磁化值（约 56 emu g-1）和较小的矫顽力值（约 31 Oe），而其他样品则显示出较低的磁化值和较高的矫顽力值。我们根据纳米粒子的核/壳模型对所获得的磁性结果进行了讨论。此外，还讨论了氧空位的存在对所获样品晶格参数和磁性能的影响。亮点通过机械化学合成获得了单相包晶 La0.6Sr0.4MnO3。研究了研磨时间和退火温度对结构和磁性能的影响。晶格参数随研磨时间或退火温度的增加而增加。所有样品在室温下都表现出铁磁性。大多数样品的磁化值都有所降低。磁性结果通过纳米粒子的核/壳模型进行了讨论。氧空位的形成会影响磁性结果。

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来源期刊

ECS Journal of Solid State Science and Technology MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED

CiteScore

4.50

自引率

13.60%

发文量

455

期刊介绍： The ECS Journal of Solid State Science and Technology (JSS) was launched in 2012, and publishes outstanding research covering fundamental and applied areas of solid state science and technology, including experimental and theoretical aspects of the chemistry and physics of materials and devices. JSS has five topical interest areas: carbon nanostructures and devices dielectric science and materials electronic materials and processing electronic and photonic devices and systems luminescence and display materials, devices and processing.