Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1090, Issue -, Pages 70-75Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2014.11.007
Keywords
Vibrational spectroscopy; Nickel chromite; X-ray diffraction; Size effect
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Funding
- Grant Agency of the Czech Republic [GACR P108/10/1250]
- program of Czech Research Infrastructures [LM2011025]
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The nanocrystalline nickel chromite (NiCr2O4) with particle size of similar to 20 nm was prepared by auto-combustion method. The nanocrystals were characterized by powder X-ray diffraction, vibrational spectroscopy and magnetic measurements. The expected structural phase transitions (cubic-tetragonal-orthorhombic) were studied by methods of temperature-dependent X-ray powder diffraction and vibrational spectroscopy. The evolution of the Raman spectra and X-ray diffraction patterns collected from 350 K down to 4 K confirmed the cubic-to-tetragonal distortion at similar to 250 K, whereas the tetragonal-to-orthorhombic transition was not confirmed in the nanocrystalline sample. (C) 2014 Elsevier B.V. All rights reserved.
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