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Phase transition in nanostructured LaMnO3

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Abstract

Nanocrystalline LaMnO3 samples have been synthesized by the coprecipitation of lanthanum and manganese salt solutions followed by annealing at 800°C in air and then in an argon flow. With the use of X-ray and neutron diffraction analysis, it has been found that the resulting samples had an orthorhombic crystal structure (space group Pbnm). In the nanocrystalline LaMnO3 samples, an order-disorder phase transition from the low-temperature phase to the high-temperature phase occurs at (220 ± 10)°C, which is much lower than the value of 477°C for bulk LaMnO3. The phase transition is due to the removal of the Jahn-Teller distortion of the Mn3+O6 oxygen octahedrons and is accompanied by a decrease in the unit cell volume of lanthanum manganite over a narrow temperature range.

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Authors and Affiliations

  1. Faculty of Materials Science, Moscow State University, Moscow, 119234, Russia

    M. V. Kharlamova

  2. Hahn-Meitner Institute Berlin, Berlin, Germany

    A. Arulraj

Authors
  1. M. V. Kharlamova
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  2. A. Arulraj
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Correspondence to M. V. Kharlamova.

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Original Russian Text © M.V. Kharlamova, A. Arulraj, 2009, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2009, Vol. 89, No. 6, pp. 350–355.

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Kharlamova, M.V., Arulraj, A. Phase transition in nanostructured LaMnO3 . Jetp Lett. 89, 301–305 (2009). https://doi.org/10.1134/S0021364009060095

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  • DOI: https://doi.org/10.1134/S0021364009060095

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