Resumo

AUGSBURGER, M. S.; PEDREGOSA, J. C.  e  SOSA, G. M.. Infrared Spectroscopy and X-Ray Diffractometry Assessment of Order-Disorder in Oxide Minerals (Mn/Fe)(Nb/Ta)₂O₆. Rev. Soc. Quím. Méx [online]. 2000, vol.44, n.2, pp.151-154. ISSN 0583-7693.

The degree of cation order of four columbite-tantalite from San Luis Range (Argentina) was evaluated from X-ray diffractometry and FTIR spectroscopy. Data were compared with those obtained by Mössbauer spectrometry. Based on structural evidences, a general assignment for the Nb/Ta-O₆ and Fe/Mn-O₆ octahedra internal vibrations is proposed.

Palavras-chave : columbite-tantalite; FTIR spectroscopy; X-ray diffractometry; Mössbauer.