Structural, magnetic and transport study of monovalent Na-doped manganite Pr0.55Na0.05Sr0.4MnO3
R. Thaljaoui , W. Boujelben , M. Pȩkała , Krystyna Pękała , J. Mucha , A. Cheikhrouhou
AbstractThe manganite Pr0.55Na0.05Sr0.4MnO 3 prepared by solid state reaction has the orthorhombic structure and mean crystallite size of 51 nm. Scanning electron microscopy (SEM) shows that the grains are irregularly spherical like shaped with sizes 400 to 700 nm. In vicinity of Curie temperature equal to 289 K the magnetic entropy change |ΔSMmax| attains 1.75 J kg-1 K-1 under an applied magnetic field of 2 T which corresponds to relative cooling power of 93 J/kg. Electrical resistivity measurements reveal a transition from metallic to semiconductor phase. Temperature variation of electrical resistivity was fitted by the small polaron hopping (SPH) and Mott's Variable range Hopping (VRH) models. The activation energy and Mott temperature are found to decrease and N(EF) to increase in magnetic field varying from zero to 1 T. The phonon contribution dominates in thermal conductivity. © 2012 Elsevier B.V. All rights reserved.
|Journal series||Journal of Alloys and Compounds, ISSN 0925-8388|
|Keywords in English||A transitions; Applied magnetic fields; Electrical resistivity; Electrical resistivity measurements; Magnetic entropy change; Na doped; Orthorhombic structures; Perovskite manganites; Relative cooling power; Semiconductor phase; Small polaron hopping; Temperature variation; Variable range hopping model, Activation energy; Electric conductivity; Electron transport properties; Magnetic fields; Magnetic properties; Magnetocaloric effects; Scanning electron microscopy; Sodium; Solid state reactions; Thermal conductivity; Transport properties, Manganese oxide|
|ASJC Classification||; ; ;|
|Score|| = 35.0, 01-02-2020, ArticleFromJournal|
= 35.0, 01-02-2020, ArticleFromJournal
|Publication indicators||= 19; : 2013 = 1.575; : 2013 = 2.726 (2) - 2013=2.407 (5)|
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