Room Temperature Antiferromagnetic Ordering of Nanocrystalline Tb_1.90Ni_0.10O₃

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• 作者：J. Mandal ; M. Dalal ; B. J. Sarkar ; P. K. Chakrabarti
• 关键词：Nanoparticle ; magnetic materials ; x ; ray diffraction ; magnetic properties
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：46
• 期：2
• 页码：1107-1113
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

Nanocrystalline Ni-doped terbium oxide (Tb_1.90Ni_0.10O₃) has been synthesized by the co-precipitation method followed by annealing at 700°C for 6 h in vacuum. The crystallographic phase and the substitution of Ni2+ ions in the lattice of Tb₂O₃ are confirmed by Rietveld analysis of the x-ray diffraction pattern using the software MAUD. High-resolution transmission electron microscopy is also carried out to study the morphology of the sample. Magnetic measurements are carried out at different temperatures from 5 K to 300 K using a superconducting quantum interference device (SQUID) magnetometer. The dependence of the magnetization of Tb_1.90Ni_0.10O₃ as a function of temperature (M–T) and magnetic field (M–H) suggests the presence of both paramagnetic and antiferromagnetic phase at room temperature, but antiferromagnetic phase dominates below ∼120 K. The lack of saturation in the M–H curve and good fitting of the M–T curve by the Johnston formula also indicate the presence of both paramagnetic and antiferromagnetic phase at room temperature. Interestingly, an antiferromagnetic to ferromagnetic phase transition is observed below ∼40 K. The result also shows a high value of magnetization at 5 K.