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Journal of Superconductivity and Novel Magnetism

, Volume 29, Issue 8, pp 2075–2084 | Cite as

The Structural, Magnetic, and Magnetocaloric Properties of La1−x Ag x MnO 3 (0.05 ≤ x ≤ 0.25)

  • A. Coşkun
  • E. Taşarkuyu
  • A. E. Irmak
  • S. Aktürk
  • A. Ekicibil
Original Paper
  • 165 Downloads

Abstract

We have investigated structural, magnetic, and magnetocaloric properties of monovalent Ag-doped La1−x Ag x MnO3 (0.05 ≤ x ≤ 0.25) compounds. The materials were prepared by the sol–gel method and then characterized by X-ray diffraction (XRD). The XRD results indicated that all the samples have a single phase of hexagonal (rhombohedral) structure with the \(R\overline {\text {3}} c\) space group. The morphology and particle size distributions were investigated using scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS). The SEM images showed that the grain sizes are smaller than 1 μm and remain the same with increasing Ag concentrations. The magnetic properties were studied by measuring magnetization and varying temperature (M(T)) and external magnetic field (M(H)). The M(T) measurements show that with decreasing temperature all samples exhibit a paramagnetic-to-ferromagnetic phase transition. The Curie temperature, T C, increases from 200 to 290 K as Ag doping increases from 0.05 to 0.25. The magnetic entropy change (|−SM|) is obtained in all samples near the Curie temperatures at a magnetic field change of 3 T. Furthermore, their maximum relative cooling power (RCP) values were found to be 82.492, 82.614, and 127.375 J/kg for x = 0.10, 0.15, and 0.25.

Keywords

Manganite Sol-gel Magnetic entropy change Curie temperature 

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • A. Coşkun
    • 1
    • 2
  • E. Taşarkuyu
    • 1
    • 2
  • A. E. Irmak
    • 1
    • 2
  • S. Aktürk
    • 1
    • 2
  • A. Ekicibil
    • 3
  1. 1.Department of Physics, Faculty of SciencesMugla Sitki Kocman UniversityMuglaTurkey
  2. 2.Magnetic Materials Laboratory, Research Laboratory CenterMugla Sitki Kocman UniversityMuglaTurkey
  3. 3.Department of Physics, Faculty of SciencesÇukurova UniversityAdanaTurkey

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