High magnesium substitution effect on the structural properties of LaFe1-xMgxO3 (x = 0.4 and 0.5) perovskite material

PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2020 (ISCPMS 2020) Pub Date : 2021-07-23 DOI:10.1063/5.0058840

Y. Yunita, U. Hanifah, D. Triyono

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Abstract

Perovskite-type oxide lanthanum orthoferrite (LaFeO3) is the newest type of candidate for electrode material because of its high electrochemical capacity and good activation property. Doping with Magnesium of LaFeO3 changes the structural properties. Material LaFe1-xMgxO3 (x = 0.4 and 0.5) synthesized using the sol-gel method. The structural properties of the materials were determined using XRD and Fourier transform infrared spectroscopy. Eg was measured using UV-VIS. The elemental composition was identified by X-Ray Fluorescence (XRF). The orthorhombic crystal structure with space group Pbnm in the sample is characterized by XRD. A second phase was identified as La2O3. XRF spectra confirmed the presence of Lanthanum, Magnesium, and Ferrum in the ratio of each element were agree with the calculation. The vibrational modes (bending and symmetric stretching) of the Fe / MgO6 octahedra were observed by FTIR spectrum. Ultraviolet-Visible spectrophotometer analysis indicated a decreasing energy gap with Mg content.

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高镁取代效应对LaFe1-xMgxO3 (x = 0.4和0.5)钙钛矿材料结构性能的影响

钙钛矿型氧化镧正铁氧体(LaFeO3)具有较高的电化学容量和良好的活化性能，是一种最新的电极候选材料。镁的掺入改变了LaFeO3的结构性能。采用溶胶-凝胶法合成材料LaFe1-xMgxO3 (x = 0.4和0.5)。采用XRD和傅里叶变换红外光谱对材料的结构性能进行了表征。Eg用UV-VIS测定。用x射线荧光(XRF)鉴定了元素组成。用XRD对样品中具有空间基团Pbnm的正交晶型结构进行了表征。第二相确定为La2O3。XRF光谱证实了镧、镁、铁在各元素中所占的比例与计算结果一致。用红外光谱观察了Fe / MgO6八面体的振动模式(弯曲和对称拉伸)。紫外-可见分光光度计分析表明，能隙随Mg含量的增加而减小。

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PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2020 (ISCPMS 2020)

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