Electrical, thermal and magnetic properties of Bi doped La 0.7-xBixSr0.3MnO3 manganites

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Abstract

We report detailed electrical, magnetic and thermoelectric studies on Bi-doped L0.7-xBixSr0.3MnO 3 (0 ≤ x ≤ 0.25) manganites. The XRD patterns and Rietveld analysis show that the studied materials are single phased. All the compounds, exhibit the expected metal-insulator transition and a decrease in the characteristic metal-insulator transition temperature (TMI) is observed to decrease with increase in Bi-content. Low temperature resistivity data indicates that grain boundaries and electron-electron scattering processes contribute vital role in the conduction process. Magnetic studies also show that the Curie temperature TC is found to decrease with Bi-content. It is observed that MZFC and MFC curves become more manifested as Bi-content is increased which indicates an increase in magnetic frustration arising due to bending of Mn-O-Mn bond. High temperature analysis on the electrical resistivity and thermoelectric power data indicates that small polaron hopping (SPH) model is valid for all the samples.

Original languageEnglish
Pages (from-to)341-351
Number of pages7
JournalJournal of Alloys and Compounds
Volume617
DOIs
Publication statusPublished - 25-12-2014

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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