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Doping effect on the local structure of metamagnetic Co doped Ni/NiO:GO core-shell nanoparticles using X-ray absorption spectroscopy and pair distribution function†

Abstract

Core-shell nanoparticles of Co (0%, 3%, and 5%) doped Ni/NiO and incorporated (5mg) graphene oxide (GO) sheets were synthesized by a sol-gel auto-combustion method. The X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and pair distribution function measurements were employed for the determination of local structure and structural properties of the samples. Due to the effect of Co doping the bond lengths of all coordinate atoms were vary. The microstructural features in the core-shell structured particles were evaluated with high-resolution transmission electron microscope (HRTEM). Magnetic properties of the samples revealed that both the interface of Ni/Co and NiO crystal lattices and the weight fraction of Ni have significant impacts on their magnetic properties at 5K to 300K. Experimental results show that Co doping and GO incorporation into Ni/NiO suppresses the antiferromagnetic charge ordering and leads to a spin-flop metamagnetic behavior at 5K to 300K temperatures. Above 5K, the step-like transitions transform into broad ones. This step-like feature is correlated with the collapse of the balance between the magnetic energy and elastic energy in the core-shell separation. It is confirmed from M-T measurements that, the blocking temperature of Ni/NiO were reduced with Co contents.

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Publication details

The article was received on 20 Aug 2018, accepted on 05 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8CP05267K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Doping effect on the local structure of metamagnetic Co doped Ni/NiO:GO core-shell nanoparticles using X-ray absorption spectroscopy and pair distribution function†

    U. P. Gawai, D. K. Gaikwad, H. A. Khawal, M. R. Bodke, A. K. Yadav, S. N. Jha, D. Bhattacharyya, K. K. Pandey and B. N. Dole, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP05267K

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