Magnetocaloric and magnetic properties of SmFe0.5Mn0.5O3 complex perovskite

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:401

Article

Silva-Santana, M. C.¹  daSilva, C. A.¹  Barrozo, P.¹  Plaza, E. J. R.¹  Valladares, L. de los Santos^2,3  Moreno, N. O.¹ 

[1] Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, SE, Brazil

[2] Univ Cambridge, Cavendish Lab, Dept Phys, Cambridge CB3 0HE, England

[3] Univ Nacl Mayor San Marcos, Lab Ceram & Nanomat, Fac Ciencias Fis, Lima 14, Peru

关键词: Complex perovskites;    Magnetic properties;    Combustion synthesis;    Spin reorientation;    Magnetocaloric effect;    Inverse magnetocaloric effect;   

DOI  :  10.1016/j.jmmm.2015.10.076

来源: Elsevier

【 摘 要 】

In this paper, we have investigated the physical properties of SmFe0.5Mn0.5O3 complex perovskite samples, synthesized by means of combustion reaction method. X-ray powder diffraction indicates the formation of single phase perovskite with orthorhombic structure. Low magnetic field measurements show remarkable transition at 234 K related to spin reorientation. The magnetocaloric effect shows two peaks related to magnetic behavior changes, at 18 K and at 234 K. The transition about 234 K presents inverse magnetocaloric effect. The entropy variation from magnetocaloric effect shows power law as function of applied magnetic field with maximum entropy change 5.6 J/kg K with field variation of 70 kOe. Critical exponents extracted from Delta S vs. H presents a remarkable sharp peak near antiferromagnetic to weak ferromagnetic transition temperature. (C) 2015 Elsevier B.V. All rights reserved.

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