Structural, magnetic, infrared and Raman studies of La0.8Sr x Ca0.2-x MnO3 (0 ≤ x ≤ 0.2)

  • P. T. Phong
  • S. J. Jang
  • B. T. Huy
  • Y.-I. Lee
  • I.-J. Lee
Article
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Abstract

We report the results of magnetic, X-ray powder diffraction, infrared and temperature dependent Raman spectra of the La0.8Sr x Ca0.2-x MnO3 (0 ≤ x ≤ 0.2) manganite. The structure refinement using the Rietveld method indicates that the partial substitution of strontium for calcium (for x ≥ 0.15) modifies the orthorhombic structure of the CaMnO3 perovskite towards a rhombohedral phase. Magnetic measurement confirms the increase in the Curie temperature from 180 K for La0.8Ca0.2MnO3 to 307 K for La0.8Sr0.2MnO3, respectively. It is argued that the substitution with the larger Sr2+ ion strengthens the double-exchange interaction and gives rise to the observed increase of transition temperatures. All manganites show two IR active vibrational modes around 400 and 600 cm−1. Moreover, when x ≤ 0.1, the absorption band around 400 cm−1 splits into two peaks. In addition, we have analyzed the frequencies and widths of the observed Raman modes as a function of temperature for all samples with various Sr content. The mode splitting is attributed to both magnetic ordering and large orthorhombic distortion in doped rhombohedral manganites.

Keywords

Raman Spectrum Manganite Raman Mode Rhombohedral Structure Dope Manganite 
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

This research was supported by Dongguk University and partly was funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) of Vietnam under grant number 103.02-2011.30. XRD was measured at Korea Basic Science Institute. The Raman spectra and SEM measurement was supported by the Basic Science Research Program (NRF 2011-0010155) and the Priority Research Centers Program (NRF 2010-0029634) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • P. T. Phong
    • 1
  • S. J. Jang
    • 1
  • B. T. Huy
    • 2
  • Y.-I. Lee
    • 2
  • I.-J. Lee
    • 1
  1. 1.Department of Advanced Materials ChemistryDongguk UniversityGyeongju-SiKorea
  2. 2.Department of ChemistryChangwon National UniversityChangwonKorea

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