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Ionics

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Influence of alkali substitution in La0.7Ca0.3Mn0.8Cr0.2O3 perovskite manganite on structural, magnetic, and transport properties

  • Narayan Dutt Sharma
  • Arun Mahajan
  • Mukesh Kumar Verma
  • Nisha Choudhary
  • Suman Sharma
  • Devinder Singh
Original Paper
  • 18 Downloads

Abstract

In order to study the effect of A-site cation mismatch on the structural, magnetic, and transport properties, a systematic investigation of La0.7Ca0.25A0.05Mn0.8Cr0.2O3 (A = Ca, Li, Na, K) has been undertaken. The XRD data of the materials, prepared by glycine-nitrate combustion method, have been analyzed by Rietveld refinement technique. The iodometric and EDX results show that except K doped sample, the desired stoichiometry of all the phases remains the same. The phases display a paramagnetic to ferromagnetic transition at low temperature with Tc found to decrease with decreasing ˂rA˃. It has been concluded that the conduction mechanism was dominated by small polaron hopping model in the high temperature paramagnetic semiconducting region.

Keywords

Combustion method Rietveld refinements Magnetic properties Transport properties 

Notes

Acknowledgements

Authors are thankful to University Grants Commission, New Delhi for financial support vide Ref. No. 20/12/2015 (11) EU-V (Sr. No. 21215101B1). Authors are also thankful to Director, Advanced Materials Research Centre, IIT Mandi, for recording XRD. Thanks are also due to Prof. Ramesh Chandra, Institute Instrumentation Centre, Indian Institute of Technology, Roorkee, for recording EDX and SEM.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Narayan Dutt Sharma
    • 1
  • Arun Mahajan
    • 1
  • Mukesh Kumar Verma
    • 1
  • Nisha Choudhary
    • 1
  • Suman Sharma
    • 1
  • Devinder Singh
    • 1
  1. 1.Department of ChemistryUniversity of JammuJammuIndia

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