Symmetry of LaAlO3 nanocrystals as a function of crystallite size |
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Authors: | PJ Dereń K Lemański A G?gor A Watras M Ma?ecka M Zawadzki |
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Institution: | Instytut Niskich Temperatur i Badań Strukturalnych PAN, ul. Okólna 2, Skr. Poczt 1410, 50-950 Wroc?aw, Poland |
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Abstract: | Properties of LaAlO3 nanocrystallites obtained by the precipitation method, doped with praseodymium and chromium ions were examined by spectroscopic means. Raman spectroscopy, high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and electronic spectroscopy proved that symmetry of LaAlO3 crystallites depends on their size. At room temperature the smallest obtained crystals (average size ∼5 nm) have cubic symmetry, while the largest ones (average size over 110 nm) exhibit rhombohedral symmetry. Possible explanations for this phenomenon are discussed. |
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Keywords: | Nanocrystals Structure Perovskites Phase transition LaAlO3 Praseodymium Chromium |
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