Structural, electrical and magnetic properties of polycrystalline La0.67(Ca1−x Sr x )0.33MnO3 manganites

  • Sen Choung Chang
  • Shaari Abdul Halim
  • Manizheh Navasery
  • Zainal Abidin Talib
  • Kean Pah Lim
  • Soo Kien Chen
  • Mohd Mustafa Awang Kechik
Article
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Abstract

Polycrystalline La0.67(Ca1−x Sr x )0.33MnO3 with different substitution level of strontium element, were synthesized via solid state reaction. Structure of samples was characterized by X-ray diffraction (XRD). XRD patterns reveal that La0.67Ca0.33MnO3 exhibits orthorhombic structure with space group Pnma. Phase transitions from orthorhombic to rhombohedral take place as Ca ions were gradually substituted by Sr ions. The XRD data were further analyzed by Rietveld refinement technique. The data show that Mn–O–Mn bond angle increases as x increases. Microstructures obtained from SEM show that substitution of Sr ions has demoted the grain growth and densification process during sintering. The substitution of Sr ions has greatly influenced the hopping integral of electron via double exchange interaction, thus affecting the electrical properties and magnetic properties as well. The resistivity decreases and the metal–insulator transition temperature (T p ) shifts to higher temperature as x increases. The magnetoresistance (MR) effect gradually decreases and MR peak shifts to higher temperature as x increases. The magnetization measured at room temperature is found to be increasing as x increases.

Keywords

Manganite Double Exchange Double Exchange Interaction MnO3 Manganite Insulator Transition Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

The Ministry of Higher Education is gratefully acknowledged for the Research Grant Scheme: ERGS with vote: 5527047 and RUGS with vote: 9199853.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Sen Choung Chang
    • 1
  • Shaari Abdul Halim
    • 1
    • 2
  • Manizheh Navasery
    • 1
  • Zainal Abidin Talib
    • 1
  • Kean Pah Lim
    • 1
  • Soo Kien Chen
    • 1
  • Mohd Mustafa Awang Kechik
    • 1
  1. 1.Department of Physics, Faculty of ScienceUniversiti Putra Malaysia (UPM)SerdangMalaysia
  2. 2.Institute of Advanced Technology (ITMA)Universiti Putra Malaysia (UPM)SerdangMalaysia

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