Magnetocaloric effect in La-0.7 NdxBa(0.3-x)MnO3 (x=0, 0.05, 0.1) perovskite manganites


Unlu C. G. , Tanis Y. E. , KAYNAR M. B. , ŞİMŞEK T. , ÖZCAN Ş.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.704, pp.58-63, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 704
  • Publication Date: 2017
  • Doi Number: 10.1016/j.jallcom.2017.02.030
  • Title of Journal : JOURNAL OF ALLOYS AND COMPOUNDS
  • Page Numbers: pp.58-63

Abstract

We have synthesized La-0.7 NdxBa(0.3-x)MnO3 (x = 0, 0.05, 0.1) perovskite manganites by using sol-gel method and investigated structure, magnetic and magnetocaloric properties. Structural analysis revealed that La0.7Ba0.3MnO3 and La0.7Nd0.05Ba0.25MnO3 have cubic and La0.7Nd0.1Ba0.2MnO3 rhombo-hedral structure. The Curie temperature of the samples decreased with increasing Nd content and equals to 303, 293 and 257 K for x = 0, 0.05, 0.1, respectively. We present experimentally by using magnetization isotherms and heat-capacity measurements that room temperature magnetic refrigeration is successfully achieved for La0.7Nd0.05Ba0.25MnO3 structure by tuning the Mn3+ to Mn4+ ratio. Additionally, zero-field and field-dependent heat-capacity measurements were compared to investigate the accuracy of the value of the adiabatic temperature-change. (C) 2017 Published by Elsevier B.V.