明溪蓝宝石改色机理探讨 |
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引用本文: | 张敬阳,袁心强. 明溪蓝宝石改色机理探讨[J]. 华侨大学学报(自然科学版), 2001, 22(3): 268-271 |
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作者姓名: | 张敬阳 袁心强 |
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作者单位: | 1. 华侨大学材料科学与工程学院, 2. 中国地质大学珠宝学院, |
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基金项目: | 福建省自然科学基金资助项目 |
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摘 要: | 利用顺磁共振谱、红外光谱和热谱等方法,研究明溪蓝宝石的结构特性,分析结果表明,Fe主要以Fe^3 的形式存在,Fe^3 的d-d电子跃迁和Fe^2 -Ti^4 ,O-Fe间电荷转移是致色的主要因素。浓度差可以作为扩散动力,高温可以加速扩散的实现。OH^-位于晶格中,H的含量与蓝宝石蓝颜色有一定的正相关性,在改色工艺中,应注重控制Fe^2 的量和提高气氛中H的含量,以促进蓝色致色因子的进一步形成,去除杂色,改善蓝宝石的颜色。
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关 键 词: | 蓝宝石 明溪 改色机理 碱性玄武岩 致色因子 电荷转移 热处理 氧扩散 |
文章编号: | 1000-5013(2001)03-0268-04 |
修稿时间: | 2001-01-17 |
An Inquiry into the Mechanism of the Colour Change of Sapphire Acquiring from Mingxi |
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Abstract: | By using the methods of nuclear magnetic resonance spectrometry and infrared spectrum and thermography, the authors conduct a study on the structural behaviour of sapphire acquiring from Mingxi. As indicated by the results, Fe exists mainly in the form of Fe 3+ , d d electron transistion of Fe 3+ and charge transfer between Fe 2+ Ti 4+ and O Fe are the main factors of colouration, concentration difference may serve as motive power of diffusion, and high temperature may accelerate the realization of diffusion. OH - is located between lattice, the content of H is positively correlated with the blue colour of sapphire to a certain degree. In technology of colour change, attention should be paid to the control of Fe 2+ amount and the enhancement of H content in the air, so as to promote further formation of blue coloration factor and to remove parti colour and to improve the colour of sapphire. |
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Keywords: | sapphire colouration color changing Mingxi |
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