Structural and magnetic properties of α-Fe2O3 with lithium ferrite prepared using co-precipitation method and annealed at different temperatures

IF 3.8 Q2 CHEMISTRY, PHYSICAL Chemical Physics Impact Pub Date : 2024-08-24 DOI:10.1016/j.chphi.2024.100717
T. Sai Santoshi , S. Bharadwaj , M. Chaitanya Varma , Vivek Dhand , G.S.V.R.K. Choudary
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Abstract

Using Co-precipitation method, an attempt was made to prepare lithium ferrite. However, during the synthesis, formation of an additional α-Fe2O3 phase along with Li0.5Fe2.5O4 was observed. To reduce the α-Fe2O3 phase, samples were annealed at 700°C, 800°C and 900°C temperatures for 2 hours. The investigated samples were then characterized using X-Ray diffraction for phase formation and Rietveld analysis was carried out to determine the different structural parameters such as phase percentage, lattice parameter and cell volume. The Chi square values were observed to be within the limit along with goodness of fit less than 3 for all the samples annealed at different temperatures. Surface morphology was carried out using scanning electron microscope and the average grain size was found to be 1.43 µm for the sample annealed at 900°C. Magnetic properties of samples were investigated, and it was observed that all the samples exhibit low values of saturation magnetization along with coercivity. The presence of two phases such as α-Fe2O3 phase and lithium ferrite phase dilutes the exchange interaction, tuning the magnetic parameters.

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用共沉淀法制备并在不同温度下退火的含锂铁氧体的 α-Fe2O3 的结构和磁特性
我们尝试使用共沉淀法制备锂铁氧体。然而,在合成过程中,观察到在 Li0.5Fe2.5O4 的同时还形成了额外的 α-Fe2O3 相。为了减少 α-Fe2O3 相,样品分别在 700°C、800°C 和 900°C 温度下退火 2 小时。然后使用 X 射线衍射法对所研究的样品进行表征,以确定相的形成,并进行里特维尔德分析,以确定不同的结构参数,如相百分比、晶格参数和晶胞体积。所有在不同温度下退火的样品的奇平方值都在限值之内,拟合优度小于 3。使用扫描电子显微镜观察了样品的表面形态,发现在 900°C 下退火的样品平均晶粒大小为 1.43 µm。对样品的磁性能进行了研究,发现所有样品的饱和磁化率和矫顽力都很低。α-Fe2O3相和锂铁氧体相等两相的存在稀释了交换相互作用,从而调整了磁性参数。
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来源期刊
Chemical Physics Impact
Chemical Physics Impact Materials Science-Materials Science (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
65
审稿时长
46 days
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