Structural, Electrical, and Magnetic Properties of High-Temperature-Sintered La1-xNaxMnO3 (0.05 <= x <= 0.35) Compounds

Irmak A. E., Tasarkuyu E., Coskun A., Akturk S., Dikmen Z., Orhun O.

JOURNAL OF ELECTRONIC MATERIALS, vol.44, no.1, pp.326-331, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44 Issue: 1
  • Publication Date: 2015
  • Doi Number: 10.1007/s11664-014-3514-6
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.326-331
  • Keywords: Sintering temperature, impurity, concentration, magnetic properties, magnetic entropy, TRANSPORT-PROPERTIES, MICROSTRUCTURE
  • Anadolu University Affiliated: Yes


The structural, electric, and magnetic properties of La1-xNaxMnO3 (0.05 <= x <= 0.35) compounds have been investigated. The compounds were prepared by a standard sol-gel method then sintered at 1400 degrees C for 24 h. The crystal structures were orthorhombic (Pbnm) for all Na concentrations, and the unit cell volumes, determined from the x-ray diffraction data, tended to decrease with increasing Na content. The high-temperature-sintering process resulted in a grainy structure with grain sizes of 5-30 mu m. The Curie temperature (T-C) increased with increasing Na concentration up to x = 0.20, then decreased with further increase in Na concentration. The maximum magnetic entropy change (-Delta S-M) under a field change of 1.6 T was calculated to be similar to 3 J/kg K for the sample containing 15% Na.