Structural Order Disorder Transformations Monitored by X-ray Diffraction and Photoluminescence.

• Autores: E. R. Leite, A.G. Souza, E. Longo, R.C. Lima, E. C. Paris, W. M. Espinosa
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 84, Nº 5, 2007, págs. 814-817
• Idioma: inglés
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• Resumen

  • This experiment introduces to students the X-ray diffraction and photoluminescence spectroscopy techniques as tools to verify structural order�disorder transformations in solid-state materials. To achieve this goal, Sm3+ ions were added to a PbTiO3 lattice by soft chemical synthesis�the so-called polymeric precursor method. After a controlled heat treatment, the presence of these ions in the PbTiO3 matrix revealed the three order states of solid matter: the short- (disordered structure), intermediate-, and long-range (crystalline or ordered structure) states.