Improved DC electrical resistivity and magnetic properties of La3+ substituted Ni0·5Co0·5Fe2-xLaxO4 (0.00 ≤ x ≤ 0.20) spinel ferrite systems

IF 3.2 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
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Abstract

In this paper, the impact of La³⁺ substitution on the structural, DC resistivity, and magnetic characteristics of Ni0·5Co0·5Fe2-xLaxO4 (where x = 0.0, 0.02, 0.04, and 0.06) prepared using a solid-state approach is reported. XRD analysis shows a single-phase cubic spinel structure with the Fd-3m space group. The lattice constants were computed based on the ionic radii of the constituents and were found to increase rapidly with higher substitution ratios. Crystallite sizes, calculated using the Scherrer formula, ranged between 45.12 and 27.71 nm. SEM images show grains with a homogeneous distribution, exhibiting increased agglomeration as particle size increases with higher concentrations. The FTIR spectra reveal two absorption peaks indicative of the spinel structure. The negative temperature coefficient, obtained using the two-probe method, confirms that the samples are semiconducting materials. The data showed that as the concentration of La³+ increased, the DC electrical resistance of the ferrite system also increased. Magnetic measurements indicated that the addition of La³+ ions leads to a decrease in coercivity values.

改善 La3+ 取代 Ni0-5Co0-5Fe2-xLaxO4 (0.00 ≤ x ≤ 0.20) 尖晶石铁氧体体系的直流电阻率和磁性能
本文报告了取代 La³⁺ 对采用固态方法制备的 Ni0-5Co0-5Fe2-xLaxO4(其中 x = 0.0、0.02、0.04 和 0.06)的结构、直流电阻率和磁特性的影响。XRD 分析表明该物质具有 Fd-3m 空间群的单相立方尖晶石结构。晶格常数是根据各成分的离子半径计算得出的,并发现随着取代率的提高,晶格常数也在迅速增加。根据舍勒公式计算得出的晶体尺寸介于 45.12 纳米和 27.71 纳米之间。扫描电子显微镜图像显示,晶粒分布均匀,随着浓度的增加,粒度增大,团聚现象也随之增加。傅立叶变换红外光谱显示出尖晶石结构的两个吸收峰。利用双探针法获得的负温度系数证实了样品是半导体材料。数据显示,随着 La³+ 浓度的增加,铁氧体系统的直流电阻也随之增加。磁性测量结果表明,加入 La³+ 离子会导致矫顽力值下降。
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来源期刊
CiteScore
3.50
自引率
7.70%
发文量
492
审稿时长
3-8 weeks
期刊介绍: The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.
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