Temperature-dependent vibrational spectroscopic and X-ray diffraction investigation of nanosized nickel chromite

0448024 - FZÚ 2016 RIV NL eng J - Článek v odborném periodiku
Matulková, Irena - Holec, Petr - Němec, I. - Kitazawa, H. - Furubayashi, T. - Vejpravová, Jana
Temperature-dependent vibrational spectroscopic and X-ray diffraction investigation of nanosized nickel chromite.
Journal of Molecular Structure. Roč. 1090, Jun SI (2015), s. 70-75. ISSN 0022-2860. E-ISSN 1872-8014
Grant CEP: GA ČR GAP108/10/1250
Institucionální podpora: RVO:68378271 ; RVO:61388980
Klíčová slova: vibrational spectroscopy * nickel chromite * X-ray diffraction * size effect
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.780, rok: 2015

The nanocrystalline nickel chromite (NiCr2O4) with particle size of similar to 20 nm was prepared by autocombustion 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 tetragonalto-orthorhombic transition was not confirmed in the nanocrystalline sample.
Trvalý link: http://hdl.handle.net/11104/0249769