Dolla Tarekegn Heliso, Billing David G, Sheppard Charles, Prinsloo Aletta, Carleschi Emanuela, Doyle Bryan P, Pruessner Karin, Ndungu Patrick
Energy, Sensors and Multifunctional Nanomaterials Research Group, Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus South Africa
DST-NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand Johannesburg South Africa.
RSC Adv. 2018 Nov 29;8(70):39837-39848. doi: 10.1039/c8ra08150f. eCollection 2018 Nov 28.
Mn substituted Mn Zn CoO ( = 0, 0.3, 0.5, 0.7, 1) oxides were synthesized by a facile co-precipitation method followed by calcination at 600 °C. The presence of manganese ions causes appreciable changes in the structural and magnetic properties of the Mn-substituted ZnCoO. The morphologies, structures, and electronic properties of Mn-Zn-Co oxide microspheres were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The X-ray diffraction and Fourier transform infrared spectroscopy results confirmed the formation of spinel Mn Zn CoO. It was shown that the Mn-Zn-Co oxide microspheres increase in size and become regular in shape with increasing Mn concentration with the crystal size lying in the range from 19.1 nm to 51.3 nm. Magnetization measurements were carried out using a vibrating sample magnetometer at room temperature and 10 K. The saturation magnetization is observed to increase with increasing Mn concentration from = 0 to = 1.
通过简便的共沉淀法合成了锰取代的锰锌钴氧化物（(x = 0, 0.3, 0.5, 0.7, 1)），随后在600℃下进行煅烧。锰离子的存在导致锰取代的锌钴氧化物的结构和磁性发生明显变化。使用扫描电子显微镜、透射电子显微镜、X射线衍射、傅里叶变换红外光谱和X射线光电子能谱对锰锌钴氧化物微球的形貌、结构和电子性质进行了表征。X射线衍射和傅里叶变换红外光谱结果证实了尖晶石型锰锌钴氧化物的形成。结果表明，随着锰浓度的增加，锰锌钴氧化物微球尺寸增大且形状变得规则，晶体尺寸在19.1nm至51.3nm范围内。在室温及10K下使用振动样品磁强计进行了磁化测量。观察到饱和磁化强度随着锰浓度从(x = 0)增加到(x = 1)而增大。
