镉取代锰锌纳米铁氧体的EPR研究

IF 1.2 Q4 NANOSCIENCE & NANOTECHNOLOGY
V. Chidambaram, R. Paulsingh
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引用次数: 2

摘要

纳米粒子的Mn0.5Zn0.5-xCdxFe2O4 x不同从x = 0.0到0.3是由湿化学共沉淀的方法。采用x射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和电子顺磁共振(EPR)技术对其结构和磁性能进行了研究。晶格常数随Cd含量的增加而增大。这种晶格常数的增加是由于cd2 + (0.97 A)离子的离子半径比fe3 + (0.64 A)离子大。(220)和(440)平面的强度随cd2 +浓度的增加而增大。这表明cd2 +离子在纳米尺度上占据了四面体A位和八面体B位,而不是它们对A位的化学偏好。电子顺磁共振(EPR)信号的线宽(ΔHpp)和g值随Cd含量的增加而减小。EPR研究计算出的x = 0.2以内所有样品的磁矩均低于理论值。这一较低的磁矩值证实了由于B位存在大量自旋无序而导致的非共线磁结构的存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
EPR studies of Cd substituted Mn Zn nanoferrites
Nanoparticles of Mn0.5Zn0.5-xCdxFe2O4 with x varying from x = 0.0 to 0.3 were prepared by wet chemical co-precipitation method. The structural and magnetic properties were studied by using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM) and Electron Paramagnetic Resonance (EPR) technique. The lattice constant increases with increase in Cd content. This increase in the lattice constant is due to larger ionic radii of the Cd 2+ (0.97 A) ions as compared to Fe 3+ (0.64 A) ions. The intensities of the planes (220) and (440), increases with increasing Cd 2+ ion concentration. This shows that Cd 2+ ions occupy tetrahedral A sites and octahedral B sites in the nano dimension against their chemical preference for A site. The line width (ΔHpp) and the g value of the Electron paramagnetic resonance (EPR) signal decreases with increase in the Cd content. The magnetic moment of all the samples up to x = 0.2 calculated from EPR studies are lower when compared to the theoretical values. This lower value of magnetic moment confirms the existence of non collinear magnetic structure arising due to significant amount of spin disorder existing at B site.
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来源期刊
international journal of nano dimension
international journal of nano dimension NANOSCIENCE & NANOTECHNOLOGY-
CiteScore
2.80
自引率
20.00%
发文量
0
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