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Title: Structural, magnetic and catalytic properties of cobalt chromite obtained through precursor method

Highlights: • CoCr{sub 2}O{sub 4} was synthesized through the tartarate and gluconate precursor routes. • Both routes led to the formation of the single-phase CoCr{sub 2}O{sub 4}. • The crystallite size was in the range of 14–21 nm. • CoCr{sub 2}O{sub 4} samples presented ferrimagnetic ordering below Currie temperature T{sub c} = 97 K. • CoCr{sub 2}O{sub 4} samples presented catalytic performance in the total oxidation of CH{sub 4}. - Abstract: Cobalt chromite (CoCr{sub 2}O{sub 4}) was synthesized through the precursor method. The precursors: (NH{sub 4}){sub 3}[CoCr{sub 2}(C{sub 4}O{sub 6}H{sub 4}){sub 4}(OH){sub 3}]·4H{sub 2}O, (NH{sub 4}){sub 3}[CoCr{sub 2}(C{sub 6}O{sub 7}H{sub 10}){sub 4}(C{sub 6}O{sub 7}H{sub 9})]·5H{sub 2}O were characterized by elemental chemical analysis, infrared (IR) and ultraviolet–visible (UV–vis) spectroscopy, and thermal analysis. The final oxides were characterized by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM/TEM), UV–vis, IR, Raman spectroscopy (RS), magnetic measurements, N{sub 2} adsorption–desorption analyses and X-ray photoelectron spectroscopy (XPS). XRD confirmed the cubic CoCr{sub 2}O{sub 4} phase only and determined average crystallite sizes between 14 and 21 nm. Electron microscopy revealed morphology corresponding to the complete crystallization into cubic CoCr{sub 2}O{sub 4}. All the samples presented ferrimagnetic ordering below the Currie temperature (T{sub c}), and a phasemore » transition at T{sub s} ∼26 K attributed to the onset of long-range spiral magnetic order. The CoCr{sub 2}O{sub 4} nanoparticles generated through the gluconate route following calcination at 700 °C for 1 h were found to have the best catalytic activity in the total oxidation of methane.« less
Authors:
 [1] ;  [1] ; ; ; ; ;  [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, Bucharest 060021 (Romania)
  2. “Politehnica” University of Bucharest, Faculty of Chemistry, Polizu Street, No. 1-7, Bucharest (Romania)
  3. National Institute of Materials Physics, Atomistilor Street, No. 105 Bis P. O. Box Mg-7, Bucharest – MagureleR-077125 (Romania)
  4. School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL (United Kingdom)
Publication Date:
OSTI Identifier:
22420802
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 62; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADSORPTION; CHEMICAL ANALYSIS; CHROMITES; COBALT COMPOUNDS; CRYSTALLIZATION; DESORPTION; MAGNETIC PROPERTIES; METHANE; MORPHOLOGY; NANOPARTICLES; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SYNTHESIS; THERMAL ANALYSIS; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY