Caracterização da Esmeralda de Pirenópolis (Goiás, Brasil Central) por Espectroscopia no Infravermelho (Ftir)

Autor:	Adriani Fischer, Edilson Valmir Benvenutti, Elzio da Silva Barboza, Genova Maria Pulz, Tania Maria Martini De Brum, Pedro Luiz Juchem
Rok vydání:	2000
Předmět:	Ftir spectra Materials science Analytical chemistry General Earth and Planetary Sciences Infrared spectroscopy Absorption (chemistry)
Zdroj:	Pesquisas em Geociências. 27:79
ISSN:	1807-9806 1518-2398
DOI:	10.22456/1807-9806.20192
Popis:	The infrared spectra of two natural samples of powdered emerald from Pirenópolis (Goiás State, Central Brazil) were measured at room temperature (~ 20ºC). Water molecules occur in two different configurations. Three absorption peaks (3656, 3592 and 1624 cm-1) record the vibrations of the type-II H2O. The peak absorption at 3691 cm-1 is assigned to type- I H2O vibrations. In addition, CO2 (2358 cm-1) and CH4 (2927-2925 cm-1) molecules were also detected in the FTIR spectra. These data can be applied to distinguish the Pirenópolis gem from the other Brazilian emeralds as well as its synthetic equivalents.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5f8d5f078ecfb12cce07d36372dccd04 https://doi.org/10.22456/1807-9806.20192 Zobrazit plný text záznamu