Technological Exploration of Heat Treatment and Spectroscopic Characteristics of Tourmaline from Keketuohai,Xinjiang
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摘要: 对新疆可可托海Fe-Li碧玺进行热处理实验,拟定了实验温度、热处理气氛、保温时间及升温与降温速度4个主要改色工艺参数。对比不同阶段的改色效果,部分样品在颜色和透明度方面取得了较好效果:黄绿色和墨绿色样品的颜色分别在550～650℃和650℃氧化气氛中得到改善,其透明度明显提高;黄褐色样品在650～700℃还原气氛中其褐色调明显减弱,颜色变为黄绿色。同时,红外吸收光谱和紫外-可见光透过光谱的跟踪测试验证了改色结果。Abstract: Heat treatment on Fe-Li tourmaline from Keketuohai,Xinjiang,are carried out and the main colour-altered technology parameters are obtained,including the experimental temperature,the atmosphere,the holding time,the velocity of heating and cooling during the heat treatment.Contrasting the effect of colour alteration at different stages,part samples show great improvement in colour and transparency.The appearances of dark-green and yellow-green samples become better respectively subjected to 550～650℃ and 650℃ in oxidative atmosphere,with obvious improvement on transparency.The colour of yellow-brown sample becomes yellow-green from weakening of the brown hue subjected to 650～700℃ in reducing atmosphere .Synchronous IR absorption spectra and UV-Vis transmission spectra are tested for verifying the results of colour alteration of the samples .
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Keywords:
- tourmaline /
- colour /
- heat treatment /
- IR absorption spectrum /
- UV-Vis transmission spectrum /
- Xinjiang
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