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Dependence of structural/morphological and magnetic properties of LaCoO3 nanoparticles prepared by citrate nitrate auto combustion
Applied Physics A ( IF 2.7 ) Pub Date : 2020-11-01 , DOI: 10.1007/s00339-020-04085-1
V. Anslin Ferby , A. Moses Ezhil Raj , M. Bououdina

Perovskite LaCoO3 nanopowders were synthesized via solution auto-combustion chemical route, using lanthanum and cobalt nitrates as oxidants and citric acid as fuel. Qualitative and Quantitative phase analysis performed by Rietveld refinements indicated the presence of pure single LaCoO3 phase. From fit parameters, goodness of fit “S” parameter (close to 1) and the difference between the experimental and theoretical XRD patterns. FTIR spectra showed two characteristics bands at 408 and 589 cm−1 characteristics of metal oxygen bands vibration, thus confirming the formation of LaCoO3 phase, whereas the strong absorption band at 589 cm−1 was assigned to Co–O stretching vibration and O–Co–O deformation modes of LaCoO3 compound. SEM micrographs clearly revealed quite spherical particles with a mean size in the range 139–178 nm and high tendency to clustering, meanwhile EDAX analysis confirmed the corresponding chemical composition with homogeneous distribution of the constituent elements. A weak paramagnetic order is observed irrespective of F/O ratio, with slight increase of the effective magnetic moment with F/O ratio; 2.72–2.93 μB, due to the presence of more high spin states.

中文翻译:

硝酸柠檬酸盐自燃制备的 LaCoO3 纳米颗粒的结构/形态和磁性能的依赖性

以硝酸镧和硝酸钴为氧化剂,柠檬酸为燃料,通过溶液自燃化学路线合成钙钛矿LaCoO3纳米粉体。Rietveld 改进进行的定性和定量相分析表明存在纯单 LaCoO3 相。从拟合参数、拟合优度“S”参数(接近 1)以及实验和理论 XRD 图案之间的差异。FTIR 光谱在 408 和 589 cm-1 处显示了金属氧带振动的两个特征带,从而证实了 LaCoO3 相的形成,而在 589 cm-1 处的强吸收带被指定为 Co-O 伸缩振动和 O-Co LaCoO3 化合物的 –O 变形模式。SEM 显微照片清楚地显示出相当球形的颗粒,平均尺寸在 139-178 nm 范围内,并且具有很高的聚集趋势,同时 EDAX 分析证实了相应的化学成分,其组成元素分布均匀。与 F/O 比无关,观察到弱顺磁有序,有效磁矩随 F/O 比略有增加;2.72–2.93 μB,因为存在更高的自旋态。
更新日期:2020-11-01
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