Growth mechanism and electron spin resonance studies of Zn1−xNixO/NiO two-phase nanocomposite

2014 IEEE 2nd International Conference on Emerging Electronics (ICEE) Pub Date : 2014-12-01 DOI:10.1109/ICEMELEC.2014.7151180

D. Joshi, D. Harish, S. Nayak, D. Roy, M. Qureshi, R. L. N. Saiprasad, T. Shiyani, D. Pamu, S. Thota

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引用次数: 2

Abstract

Two-phase nanocomposites comprised of Zn_1-xNi_xO/NiO (0.05 ≤ x ≤ 0.3) were grown by using sol-gel process with hydrated metal acetates as precursors. Thermal decomposition of the co-precipitated oxalate α-ZnNi(C₂O₄) yields wurtzite h.c.p. Zn_1-xNi_xO and f.c.c. NiO together. The X-band electron spin resonance spectra provide the signatures of anisotropic spin interactions with long-range magnetic ordering at 300 K. The temperature variation (120 K ≤ T ≤ 300 K) of the resonance field H_R(T) and line-width ΔH_PP(T) depicts a clear anomaly across 140 K associated with the blocking/freezing effects and the contribution of additional surface anisotropy (K_eff) present in the system. Both H_R(T) and ΔH_PP(T) follows the power-law variation δH_R = (ΔH_PP)ⁿ with n ≃ 2.13, as expected for partially oriented nanocrystallites.

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Zn1−xNixO/NiO两相纳米复合材料的生长机理及电子自旋共振研究

采用溶胶-凝胶法制备了Zn1-xNixO/NiO(0.05≤x≤0.3)两相纳米复合材料。共沉淀草酸α-ZnNi(C2O4)热分解生成纤锌矿(hcp . Zn1-xNixO和fcc . NiO)。x波段电子自旋共振谱提供了300 K下具有长程磁有序的各向异性自旋相互作用的特征。共振场HR(T)和线宽ΔHPP(T)的温度变化(120 K≤T≤300 K)描述了与阻塞/冻结效应和系统中存在的附加表面各向异性(Keff)的贡献相关的140 K范围内的明显异常。HR(T)和ΔHPP(T)均服从幂律变化δHR = (ΔHPP)n, n≃2.13，符合部分取向纳米晶体的预期。

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2014 IEEE 2nd International Conference on Emerging Electronics (ICEE)

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