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Deren P.J.,Instytut Niskich Temperatur i Bada Strukturalnych PAN | Lemanski K.,Instytut Niskich Temperatur i Bada Strukturalnych PAN | Gagor A.,Instytut Niskich Temperatur i Bada Strukturalnych PAN | Watras A.,Instytut Niskich Temperatur i Bada Strukturalnych PAN | And 2 more authors.
Journal of Solid State Chemistry | Year: 2010

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. © 2010 Elsevier Inc. All rights reserved. Source

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