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Title: Investigation of nanocrystalline zinc chromite obtained by two soft chemical routes

Graphical abstract: - Highlights: • Two soft chemical routes to synthesize zinc chromites are described. • Glycine is used as chelating agent (precursor method) and fuel (solution combustion method). • The synthesized chromites have crystallite size in the range of 18–27 nm. • An antiferromagnetic (AFM) transition is observed at about T{sub N} ∼ 18 K. - Abstract: Zinc chromite (ZnCr{sub 2}O{sub 4}) nanocrystalline powders were obtained by two different chemical routes: the precursor method and the solution combustion method involving glycine-nitrates. The complex compound precursors, [ZnCr{sub 2}(NH{sub 2}CH{sub 2}COO){sub 8}]·9H{sub 2}O and [ZnCr{sub 2}(NH{sub 2}CH{sub 2}COOH){sub 4.5}]·(NO{sub 3}){sub 8}·6H{sub 2}O, were characterized by chemical analysis, infrared spectroscopy (IR), ultraviolet–visible spectroscopy (UV–vis) and thermal analysis. The structure, morphology, surface chemistry and magnetic properties of ZnCr{sub 2}O{sub 4} powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), infrared and Raman spectroscopy (RS), ultraviolet–visible spectroscopy (UV–vis) and magnetic measurements. X-ray diffraction patterns indicated the chromite spinel phase with good crystallinity and an average crystallite size of approximately 18–27 nm. The band gap values ranged between 3.31 and 3.33 eV. The magnetic measurements indicated an antiferromagnetic transition at T{sub N} ∼ 17.5/18 K.
Authors:
 [1] ;  [1] ; ; ; ;  [1] ;  [2] ;  [1] ;  [3]
  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 1-7, Bucharest (Romania)
  3. School of Chemistry, University of Manchester, Oxford Road, M 13 9PL Manchester (United Kingdom)
Publication Date:
OSTI Identifier:
22341828
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 49; Other Information: Copyright (c) 2013 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; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; CHELATING AGENTS; CHEMICAL ANALYSIS; CRYSTALS; FUEL SOLUTIONS; GLYCINE; INFRARED SPECTRA; MAGNETIC PROPERTIES; NANOSTRUCTURES; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SPINELS; SYNTHESIS; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC