Magnetocaloric effect of monovalent K doped manganites Pr0.6Sr0.4-xKxMnO3 (x=0 to 0.2)

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:352

Article

Thaljaoui, R.^1,2,3  Boujelben, W.¹  Pekala, M.³  Pekala, K.²  Fagnard, J. -F.⁴  Vanderbemden, P.⁴  Donten, M.³  Cheikhrouhou, A.¹ 

[1] Univ Sfax, Fac Sci Sfax, Phys Mat Lab, Sfax 3000, Tunisia

[2] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland

[3] Univ Warsaw, Dept Chem, PL-02089 Warsaw, Poland

[4] Univ Liege, SUPRATEC, Dept Elect Engn & Comp Sci B28, Liege, Belgium

关键词: Monovalent doped manganite;    X-ray diffraction;    SEM;    Arrott plots;    Magnetocaloric effect;    Phase transition;   

DOI  :  10.1016/j.jmmm.2013.09.057

来源: Elsevier

【 摘 要 】

Magnetic and magnetocaloric properties are reported for polycrystalline monovalent potassium doped manganites Pr0.6Sr0.4-xKxMnO3 (x=0, 0.05, 0.1, 0.15 and 0.2) crystallized in orthorhombic structure with Pnma space group. The increasing K content shifts the paramagnetic to ferromagnetic transition temperature from 310 K for x=0 to 269 K for x=0.2. The magnetic entropy change under magnetic field variation of 2 T is found to be 1.95, 3.09, 2.89, 3.05 and 3.2 J/kgK for x varying from 0 to 0.2, respectively. The highest relative cooling power of 102 J/kg is observed for the undoped sample. The sensitivity of magnetic entropy change to magnetic field is estimated by a local N(T) exponent exhibiting the characteristic temperature variation. Phenomenological universal curves of entropy change and Arrott plots confirm the second order phase transition. (C) 2013 Elsevier B.V. All rights reserved.

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