NDLI: The obtaining of NiCr$_{2}$O$_{4}$ nanoparticles by unconventional synthesis methods

Content Provider	Springer Nature Link
Author	Ştefănescu, Mircea Barbu, Mirela Barvinschi, Paul Ştefănescu, Oana
Copyright Year	2012
Abstract	This paper presents a study regarding the obtaining of NiCr$_{2}$O$_{4}$ 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 Cr$_{2}$O$_{3+x }$ and NiO, with advanced homogeneity, small particles and high reactivity. On heating this mixture at 500 °C, Cr$_{2}$O$_{3}$ reacts with NiO to form NiCr$_{2}$O$_{4}$, which was evidenced by FT-IR and X-ray diffractometry (XRD) analysis; (ii) the second method starts from a mechanical mixture of (NH$_{4}$)$_{2}$Cr$_{2}$O$_{7}$ and Ni(NO$_{3}$)$_{2}$·6H$_{2}$O. On heating this mixture, a violent decomposition at 240 °C with formation of an oxides mixture (Cr$_{2}$O$_{3}$ + CrO$_{3}$) and NiO takes place. On thermal treatment up to 500 °C, an intermediary phase NiCrO$_{4}$ is formed, which by decomposition at ~700 °C leads to NiCr$_{2}$O$_{4}$, evidenced by FT-IR and XRD analysis. NiCr$_{2}$O$_{4}$ is formed, in both cases, starting with a temperature higher than 400 °C, when the non-stoichiometric chromium oxide (Cr$_{2}$O$_{3+x }$) loses the oxygen excess and turns to stoichiometric chromium oxide (Cr$_{2}$O$_{3}$), which further reacts with NiO.
Starting Page	1121
Ending Page	1127
Page Count	7
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	111
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chromites Carboxylate Bichromate Thermal analysis Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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