Navegando por Autor "Barbosa, Ananias Alves"

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    Growth and characterization of potassium cobalt nickel sulfate hexahydrate crystals : a new UV light filter.
    (2017) Pacheco, Tiago de Sousa; Ghosh, Santunu; Oliveira, Michelle de; Barbosa, Ananias Alves; Perpétuo, Genivaldo Julio; Franco, Carlos Joel
    Samples of the empirical formula Kþ 2 Ni2þ x Co2þ ð1 xÞ ðSO4Þ 2,6H2O were grown with a partial occupation of the cations Co and Ni. Mixed crystals with good optical quality were obtained by the slow evaporation growth method. In the decomposition process, these crystals suffer a mass loss of approximately 24%, equivalent to water molecules forming octahedral coordination ions of Ni and Co. The optical characteristics of the grown crystals were measured where transmittance reached more than 80% in the wavelength range of 190e390 nm. By Raman spectroscopy, the vibrational modes of SO2 4 , H2O and of the octahedral Ni(H2O)6 and Co(H2O)6 were identified.