Raman and infrared spectrometry of gadolinium aluminates pure and doped / Espectroscopia no infravermelho e Raman do aluminato de gadolineo puro e dopado com íons de terras raras

AUTOR(ES)
DATA DE PUBLICAÇÃO

1983

RESUMO

IR and Raman measurements were carried out in pure and Eu+3 - doped GdAlO3 with the purpose of understanding their K=O phonom modes and the Eu+3 electronic transitions. Starting from the GdAlO3 symmetry, (D162h) the correlation method allows the classification of the number and symmetries of the modes, as well their assignment as either internal or external. Experimental and theoretical results are in good agreement and show three well defined absorption bands in GdAlO3. The internal modes are found to be located around 670cm-1 (stretching) and 480cm-1 (bending), while the external modes are around 200cm-1. The interaction of Eu+3 electronic states with the GdAlO3 crystal fields were studied by taking into account small perturbative orthorrombic (Cs) distorcion on a crystal field with symmetry Oh. This small distortion lifts completely the degeneracy of the 7FJ (J=0,1,...,6) levels and allows the 7F0 → 7FJ transitions.

ASSUNTO(S)

espectro raman espectro ir aluminato de gadolineo gadolinium aluminate infrared raman

ACESSO AO ARTIGO

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