Synthesis and Properties of Cobalt Sulfide Phases: CoS2and Co9S8

Kumar, Nitesh ; Raman, Natarajan ; Sundaresan, Athinarayanan (2014) Synthesis and Properties of Cobalt Sulfide Phases: CoS2and Co9S8 Zeitschrift fur Anorganische und Allgemeine Chemie, 640 (6). pp. 1069-1074. ISSN 0044-2313

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Single phase cobalt disulfide (CoS2) nanoparticles were prepared by thermal decomposition of cobalt-thiourea complex at a low temperature (400 °C). CoS2 nanoparticles exhibit ferromagnetic ordering at 122 K below which the temperature dependent resistivity of cold pressed nanoparticles deviates from metallic behavior and shows a broad maximum. Just below TC, it also exhibits a large magnetoresistance effect (6.5 %). A mixture of CoS and Co9S8 phases were obtained between the temperature interval 400 °C < T < 1000 °C. At 1000 °C, a pure bulk Co9S8 phase was obtained. It exhibits magnetic hysteresis typical of a ferromagnet at room temperature and a peak in magnetization at low temperature with a strong relaxation indicating possible spin glass state.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons, Inc.
ID Code:120020
Deposited On:21 Jun 2021 14:01
Last Modified:21 Jun 2021 14:01

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