Počet záznamů: 1

Synthesis, structural and electrical characterizations of DySr.sub.5./sub.Ni.sub.2.4./sub.Cu.sub.0.6./sub.O.sub.12-δ./sub..

  1. 1.
    0369776 - FZU-D 2012 RIV US eng J - Článek v odborném periodiku
    Hamdi, S. - Ouni, S. - Chaker, H. - Rohlíček, Jan - Ben Hassen, R.
    Synthesis, structural and electrical characterizations of DySr5Ni2.4Cu0.6O12-δ.
    Journal of Solid State Chemistry. Roč. 184, č. 11 (2011), s. 2897-2901 ISSN 0022-4596
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: Rietveld refinement * K2NiF4-type structure * electrical resistivity * oxygen vacancies * iodometric titration
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.159, rok: 2011

    A new compound DySr5Ni2.4Cu0.6O12-δ has been prepared by sol gel method and annealed at 1473 K in 1 atm of Ar gas flow. The X-ray diffraction (XRD) is used for phase identification. The sample shows to adopt the K2NiF4-type structure based on tolerance factor calculation. XRD analysis using the Rietveld method was carried out and it was found that DySr5Ni2.4Cu0.6O12-δ (Dy0.33Sr1.67Ni0.8Cu0.2O4-δ) compound crystallizes in tetragonal symmetry with space group I4/mmm (Z = 2). The lattice parameters are found to be at room temperature a = 3.7696(5) ˚A and c = 12.3747(2) A . The final relia! bility indices were: RB = 5.219% and χ2 = 3.47. Four probe electrical resistivity measurements were performed versus temperature in the range 294-579 K. A semiconducting behaviour over the whole range of temperature, with a conductivity maximum of 0.4 S cm-1 is observed at 510 K.
    Trvalý link: http://hdl.handle.net/11104/0006757