Structural, magnetic and magnetocaloric properties of (La1-xSmx)(0.85)K0.15MnO3 (x=0.0, 0.1, 0.2 and 0.3) perovskite manganites

AKÇA G., Cetin S. K., EKİCİBİL A.

CERAMICS INTERNATIONAL, cilt.43, sa.17, ss.15811-15820, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 17
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1016/j.ceramint.2017.08.150
  • Dergi Adı: CERAMICS INTERNATIONAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.15811-15820
  • Anahtar Kelimeler: Magnetocaloric effect, Magnetic entropy changes, Perovskite manganites, Curie temperature, Landau theory, ELECTRICAL-TRANSPORT PROPERTIES, ROOM-TEMPERATURE, ENTROPY CHANGE, NEUTRON-DIFFRACTION, NANOCRYSTALLINE, DY, SUBSTITUTION, DISTORTION, LANTHANUM, PR
  • Çukurova Üniversitesi Adresli: Evet

Özet

We have investigated effect of Sm ion substitution on structural, magnetic and magnetocaloric properties of solgel synthesized (La(1-x)Smx)(0.85)K0.15MnO3 (x = 0.0, 0.1, 0.2 and 0.3) perovskite manganites. X-ray diffraction analyses confirm that samples crystallize with rhombohedral symmetry in the R3c space group. The temperature dependence of magnetization measurements shows a clear ferromagnetic (FM)-paramagnetic (PM) phase transition with increasing temperature, and magnetic phase transition temperature (T-c) decreases with increasing Sm concentration. For Sm concentrations (x = 0.0, 0.1, 0.2 and 0.3), magnetic field dependence of the maximum magnetic entropy change (-Delta S-M(max)) are determined up to 5 T to be 7.32, 3.37, 3.28 and 2.70 J kg(-1) K-1, respectively. These experimental values are also in good agreement with the calculation of the magnetic entropy change using Landau theory.