Temperature evolution of nickel sulphide phases from thiourea complex and their exchange bias effect

Kumar, Nitesh ; Raman, N. ; Sundaresan, A. (2013) Temperature evolution of nickel sulphide phases from thiourea complex and their exchange bias effect Journal of Solid State Chemistry, 208 . pp. 103-108. ISSN 0022-4596

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Official URL: http://doi.org/10.1016/j.jssc.2013.10.010

Related URL: http://dx.doi.org/10.1016/j.jssc.2013.10.010

Abstract

Considering the very complex phase diagram of nickel sulphide, it is quite challenging to stabilize pure phases from a single precursor. Here, we obtain nanoparticles of various phases of nickel sulphide by decomposing nickel–thiourea complex at different temperatures. The first phase in the evolution is the one with the maximum sulphur content, namely, NiS2 nanoparticles obtained at 400 °C. As the temperature is increased, nanoparticles of phases with lesser sulphur content, NiS (600 °C) and Ni3S2 (800 °C) are formed. NiS2 nanoparticles exhibit weak ferromagnetic transition at 30 K and show a large exchange bias at 2 K. NiS nanoparticles are antiferromagnetic and show relatively smaller exchange bias effect. On the other hand, Ni3S2 nanoparticles exhibit very weak temperature dependent magnetization. Electrical measurements show that both NiS2 and NiS are semiconductors whereas Ni3S2 is a metal.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:120026
Deposited On:22 Jun 2021 04:14
Last Modified:22 Jun 2021 04:14

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