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- Title
The obtaining of NiCrO nanoparticles by unconventional synthesis methods.
- Authors
Ştefănescu, Mircea; Barbu, Mirela; Barvinschi, Paul; Ştefănescu, Oana
- Abstract
This paper presents a study regarding the obtaining of NiCrO by two new unconventional synthesis methods: (i) the first method is based on the formation of Cr(III) and Ni(II) carboxylate-type precursors in the redox reaction between the nitrate ion and 1,3-propanediol. The thermal decomposition of these complex combinations, at ~300 °C, leads to an oxide mixture of CrO and NiO, with advanced homogeneity, small particles and high reactivity. On heating this mixture at 500 °C, CrO reacts with NiO to form NiCrO, which was evidenced by FT-IR and X-ray diffractometry (XRD) analysis; (ii) the second method starts from a mechanical mixture of (NH)CrO and Ni(NO)·6HO. On heating this mixture, a violent decomposition at 240 °C with formation of an oxides mixture (CrO + CrO) and NiO takes place. On thermal treatment up to 500 °C, an intermediary phase NiCrO is formed, which by decomposition at ~700 °C leads to NiCrO, evidenced by FT-IR and XRD analysis. NiCrO is formed, in both cases, starting with a temperature higher than 400 °C, when the non-stoichiometric chromium oxide (CrO) loses the oxygen excess and turns to stoichiometric chromium oxide (CrO), which further reacts with NiO.
- Subjects
NICKEL alloys; NANOPARTICLE synthesis; METAL ions; METAL complexes; FOURIER transform infrared spectroscopy; CHEMICAL decomposition; STOICHIOMETRY
- Publication
Journal of Thermal Analysis & Calorimetry, 2013, Vol 111, Issue 2, p1121
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-011-2177-2