Prospection of pyrochlore and microlite mineral groups through Raman spectroscopy coupled with artificial neural networks

Autor(es)

Alencar Exposito De Queiroz, Alfredo Antonio ; Andrade, Marcelo B.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Raman Spectroscopy; v. 53, n. 11, p. 7-pg., 2022-08-19.

Resumo

Niobium (Nb) and tantalum (Ta) concentrated in pyrochlore and microlite mineral groups, respectively, have attracted worldwide attention due to their importance to aerospace and electronics industries. This manuscript addresses the use of Raman spectroscopy coupled with artificial neural networks (ANNs) for improving the identification and characterization of mineral species belonging to pyrochlore and microlite mineral groups. Spectral data were collected in the 100-1400 cm(-1) range and two baseline corrections, namely Asymmetric Least Squares (ALS) and Piecewise Linear Fitting (PLF) were performed and compared. In most cases, ALS achieved better performance in the removal of background noise with no elimination of important features of the original spectrum. The ANNs were fed with balanced datasets and based on different topologies with logistics, hyperbolic tangent, and rectified linear unit activation functions in the hidden layers. (AU)

• Processo FAPESP: 13/03487-8 - Centro de caracterização de novas espécies minerais: espectroscopia Raman, difração por raios X e nêutrons, e microssonda eletrônica
• Beneficiário: Marcelo Barbosa de Andrade
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores