Influence of higher sodium substitutions on magnetic entropy change and transition temperature in lanthanum manganites

N. Sethulakshmi, I. A. Al Omari, M. R. Anantharaman

Research output: Contribution to journalArticle

Abstract

Present investigation focuses on the variation of magnetic entropy change for higher sodium substitution above 50% in lanthanum manganites. Magnetic measurements indicated that all samples exhibit a ferromagnetic ordering near room temperature. Magnetic isotherms for different temperatures above and below 300 K were recorded and the magnetic entropy change for compositions belonging to La1-xNaxMnO3 for x = 0.6 to 0.9 in steps of 0.1 was estimated for different applied magnetic fields. It has been found that the compositions having a Na substitution of 0.6 are having the largest entropy change, and the entropy change increases with applied magnetic field for all compositions. The change in entropy also decreases with increase in substitution of sodium. A notable change in transition temperature with Na concentration is also found in this sample series.

Original languageEnglish
Pages (from-to)1545-1552
Number of pages8
JournalBulletin of Materials Science
Volume38
Issue number6
Publication statusPublished - Oct 1 2015

Keywords

  • Magnetic entropy change
  • Magnetic materials
  • Manganites

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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