摘要:
红-黄色翡翠是否经过热处理,其价值相差悬殊。随着市场对红-黄色翡翠的需求增加,鉴别其是否经过热处理是目前宝玉石鉴定的难点和热点问题。通过加热实验,利用红外光谱测试技术对加热前、后的红-黄色翡翠样品的红外光谱进行对比分析。结果表明,加热前、后的红-黄色翡翠样品的红外光谱具有不同的特征,主要表现为硬玉结构中OH的四组吸收峰强弱的变化:(1)吸收峰的强变化是在 3000~4000 cm-1之间的峰型从加热前呈U型到加热后呈V型;(2)吸收峰的弱变化则是谱线略有改变,出现3622~3628 cm-1或3670cm-1附近的吸收峰,这些特征可作为红-黄色翡翠是否经过加热处理的辅助性诊断指标。
Abstract:
The value of red-yellow jadeites is very different depending on whether they have been processed with heat treatment, With an increasing demand for red-yellow jadeites, it has been a key as well as difficult issue to distinguish whether the jadeites are experienced heat treatments or not. In this paper, the heat treatment experiments are carried out on the red-yellow jadeites, and the infrared spectra of the jadeites before and after heat treatment are also compared, The results show that different spectral characteristics, i. e, the variation of intensity for four absorption peaks due to the hydroxyl structure of jadeite: (1) obvious changes appear at 3 000-4 000 cm-1 from U structure before heat treatment to V structure after heat treatment; (2) small changes appear at 3 622- 3 628 cm-1 or 3 670 cm-1.These features could be used as the assistant diagnostic index to determine whether the jadeites have been heat treated or not.
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