期刊名称：Walailak Journal of Science and Technology (WJST)
印刷版ISSN：2228-835X
出版年度：2016
卷号：13
期号：12
页码：977-983
DOI：10.14456/vol13iss12pp%p
语种：English
出版社：Institute of Research and Development, Walailak University.
摘要：Rough green beryls from Madagascar were studied for their gemological characteristics after heat treatment. The conversion of the iron oxidation state after heating was studied using the modern technique of X-ray absorption spectroscopy. The X-ray absorption near edge spectroscopy (XANES) results are in conclusively agreement with the traditional Ultraviolet-visible-near infrared (UV-Vis-NIR) technique, where Fe 3+ in an octahedral site is changed into Fe 2+ after heat treatment. The undesirable yellow tinge in the stone, therefore, is expelled and, thus, an attractive blue color is developed. The green beryls contained moderate amounts of chromophore iron (up to 1.08 wt.% FeO (total) ), and relatively low amounts of Cs and Na. Fourier transform infrared (FTIR) spectroscopic features and chemical analyses are consistent with alkali-poor beryl. The gemological characterization of Malagasy green beryl is also presented in detail.
其他摘要：Rough green beryls from Madagascar were studied for their gemological characteristics after heat treatment. The conversion of the iron oxidation state after heating was studied using the modern technique of X-ray absorption spectroscopy. The X-ray absorption near edge spectroscopy (XANES) results are in conclusively agreement with the traditional Ultraviolet-visible-near infrared (UV-Vis-NIR) technique, where Fe 3+ in an octahedral site is changed into Fe 2+ after heat treatment. The undesirable yellow tinge in the stone, therefore, is expelled and, thus, an attractive blue color is developed. The green beryls contained moderate amounts of chromophore iron (up to 1.08 wt.% FeO (total) ), and relatively low amounts of Cs and Na. Fourier transform infrared (FTIR) spectroscopic features and chemical analyses are consistent with alkali-poor beryl. The gemological characterization of Malagasy green beryl is also presented in detail.
