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

Abstract

The 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.
Author R. Thaljaoui
R. Thaljaoui,,
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, W. Boujelben
W. Boujelben,,
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, M. Pȩkała
M. Pȩkała,,
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, Krystyna Pękała (FP / SD)
Krystyna Pękała,,
- Semiconductors Division
, J. Mucha
J. Mucha,,
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, A. Cheikhrouhou
A. Cheikhrouhou,,
-
Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388
Issue year2013
Vol558
Pages236-243
Keywords in EnglishA 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 Classification2505 Materials Chemistry; 2506 Metals and Alloys; 2210 Mechanical Engineering; 2211 Mechanics of Materials
DOIDOI:10.1016/j.jallcom.2013.01.008
URL http://www.scopus.com/inward/record.url?eid=2-s2.0-84873728256&partnerID=40&md5=6fb84e46a9854362ff947f316950fc9c
Languageen angielski
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 35.0, 01-02-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 01-02-2020, ArticleFromJournal
Publication indicators Scopus Citations = 19; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.575; WoS Impact Factor: 2013 = 2.726 (2) - 2013=2.407 (5)
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