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Abstract In this work we report optical absorption spectroscopy study of thermal and irradiation effects on samples of amethyst from Minas Gerais and Rio Grande do Sul, Brazil. Three bands were studied: 10500 cm?1 (k), 18300 cm?1 (θ) and 28000 cm?1 (ζ). Thermal and irradiation effects shows that the θ and ζ bands belongs to a same center and the k band to another center. The isothermal decay and irradiation growth of these band reveal a complex kinetics. The optical absorption bands of amethyst from Minas Gerais do not recover the prmitive absorbance after being bleached at 470°C and irradiated. This sample heated at 470°C in highly reducing atmosphere gets a yellow-brown color. The amethyst from Rio Grande do Sul treated at 400°C gets, also, a yellow-brown color. We suggest this color is probalbly due to the formation of Fe2O3 submicroscopc segregate crystals due to the diffusion of Fe ions and oxygen vacancies. 相似文献
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García-Castro D. Ajoor M. Alvarez-Pol H. Blanco A. Cabanelas P. Callón-Rivas J. Collazo J. Clemencio F. Cuenca-García J. J. Cruces M. Fonte P. Fontenla Y. Flores J. Garzón J. A. Gomis-Moreno A. Iglesias A. Kornakov G. Kurtukian-Nieto T. Lopes L. Loureiro C. Pazos A. Rodríguez C. Saraiva J. P. Seco M. Valladares M. Villasante-Marcos V. Xuna J. 《Physics of Atomic Nuclei》2021,84(6):1070-1079
Physics of Atomic Nuclei - The TRASGO project develops high resolution tracking detectors, sensitive to single electrons and muons as well as to bundles of both kinds of particles. Two detectors... 相似文献
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