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

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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.

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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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Authors and Affiliations

  1. Department of Advanced Materials Chemistry, Dongguk University, 707 Suckjang-dong, Gyeongju-Si, 780-714, Gyeonbuk, Korea

    P. T. Phong, S. J. Jang & I.-J. Lee

  2. Department of Chemistry, Changwon National University, Changwon, 643-773, Korea

    B. T. Huy & Y.-I. Lee

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  1. P. T. Phong
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  2. S. J. Jang
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Correspondence to P. T. Phong.

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Phong, P.T., Jang, S.J., Huy, B.T. et al. Structural, magnetic, infrared and Raman studies of La0.8Sr x Ca0.2-x MnO3 (0 ≤ x ≤ 0.2). J Mater Sci: Mater Electron 24, 2292–2301 (2013). https://doi.org/10.1007/s10854-013-1092-7

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