CoFe2O4纳米立方和纳米球的表征及磁相分辨

Renju Miriam Cheriyan, I. Anila, M. Mathew
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引用次数: 1

摘要

采用水热法制备了钴铁氧体纳米样品,并通过不同的水热反应时间对其进行了结构和形态分析。室温下的x射线衍射分析证实了纯相样品的形成。反应时间从6hr到24hr不等,合成的样品尺寸从9.4nm到28nm不等。TEM和XRD的结果与颗粒尺寸一致。粒径随反应时间的增加而增加,并且随着反应时间的增加,观察到从纳米球到纳米立方的有趣形态转变。磁性研究是在室温下使用VSM分析完成的。从分析中提取了重要的磁性参数,并利用python编写的程序求出了不同磁化相对总磁化强度的贡献。从M-H曲线分析中,发现了铁磁和顺磁对磁化强度的贡献。所有样品均表现出铁磁性和顺磁性贡献。结果表明,纳米立方的铁磁性贡献为74.34%,顺磁性贡献为25.65%,而纳米微球的铁磁性贡献为93.8%,顺磁性贡献仅为6.2%。
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Characterization and magnetic phase resolution of CoFe2O4 nanocubes and nanospheres
Cobalt ferrite nanosamples are prepared by hydrothermal method and their structural and morphological analysis are conducted by varying hydrothermal reaction time. X-ray diffraction analysis at room temperature confirms the formation of pure phase sample. Samples with size varying from 9.4nm to 28nm were synthesized by varying reaction time from 6hr to 24hr. Both TEM and XRD results match regarding particle size. The particle size is found to increase with increase in reaction time and also an interesting morphology transition from nanospheres to nanocube is observed as reaction time is increased. Magnetic studies are done using VSM analysis at room temperature. Magnetic parameters of importance are extracted from the analysis and the contributions of different magnetization phases to the total magnetization are found using a program developed in python. Excellent fits are obtained for all three samples and from the M-H curve analysis, ferromagnetic and paramagnetic contributions to the magnetization are found. All samples show ferromagnetic and paramagnetic contributions. The nanocube is found to have 74.34% ferromagnetic contribution and 25.65% of Paramagnetic contribution whereas the nanospheres are found to be almost entirely ferromagnetic with 93.8% contribution and only 6.2 % of paramagnetic contribution.
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