[en] Pr0.55K0.05Sr0.4MnO3 sample have been synthesized using the conventional solid state reaction. Rietveld refinements of the X-ray diffraction patterns at room temperature confirm that the sample is single phase and crystallizes in the orthorhombic structure with Pnma space group; the crystallite size is around 70 nm. The SEM images show that grain size spreads around 1000–1200 nm. DTA analysis does not reveal any clear transition in temperature range studied. The low-temperature DSC indicates that Curie temperature is around 297 K. Magnetization measurements in a magnetic applied field of 0.01 T exhibit a paramagnetic–ferromagnetic transition at the Curie temperature TC = 303 K. A magnetic entropy change under an applied magnetic field of 2 T is found to be 2.26 J kg−1 K−1, resulting in a large relative cooling power around 70 J/kg. Electrical resistivity measurements reveal a transition from semiconductor to metallic phase. The thermal conductivity is found to be higher than that reported for undoped and Na doped manganites reported by Thaljaoui et al. (2013).
Research Center/Unit :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Thaljaoui, R.; Facuté des Sciences de Sfax, Université de Sfax, Tunisia > Laboratoire de Physique des Matériaux
Boujelben, W.; Faculté des Sciences de Sfax, Université de Sfax, Tunisia > Laboratoire de Physique des Matériaux
Pękała, M.; University of Warsaw, Poland > Department of Chemistry
Pękała, K.; Warsaw University of Technology, Poland > Faculty of Physics
Antonowicz, J.; Warsaw University of Technology, Poland > Faculty of Physics
Fagnard, Jean-François ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Vanderbemden, Philippe ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Dąbrowska, S.; Warsaw University of Technology, Poland > Faculty of Materials Science
Mucha, J.; Institute of Low Temperature Physics and Structural Research, Wrocław, Poland
Language :
English
Title :
Structural, magnetic and magneto-transport properties of monovalent doped manganite Pr0.55K0.05Sr0.4MnO3
MHESR - Ministère de l'Enseignement Supérieur et de la Recherche Scientifique MNiSW - Polish Ministry of Science and Higher Education WBI - Wallonie-Bruxelles International
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