Synthetic Pink Sapphire
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摘要: 天然粉红色蓝宝石是彩色蓝宝石中的名贵品种,特别是padparadscha蓝宝石,由于其产量稀少,市场价格十分昂贵。讨论了在研制合成掺Ti蓝宝石激光晶体时得到的一种副产品——合成粉红色蓝宝石(以Ti3+为主要着色离子)以及在其晶体生长过程中Ti3+离子价态的控制方法。介绍了运用晶体提拉法生长合成粉红色蓝宝石晶体的实验方法和过程。结果表明,带有明显紫色调的合成掺Ti蓝宝石样品通过在纯氢还原气氛中、1920~ 950℃下恒温48 h的热处理后,可使其呈现类似于padparadscha蓝宝石的粉红色调,转变为粉红色蓝宝石。采用常规宝石学测试方法、能量色散X射线荧光光谱仪等对合成粉红色蓝宝石样品进行了宝石学特征分析。Abstract: Natural pink sapphire,especially padparadscha sapphire,is one of the precious kind in fancy sapphire and very expensive because of its rare yield.In the paper,it is discussed that the synthetic pink sapphire coloured by Ti3+ ions is gained as the by-product while synthetic Ti-doped sapphire laser crystals are studied,including the control method of the Ti3+ valence during the process of crystal growth.The experimental process and method of synthetic pink sapphire grown by the czochralski method are also introduced.The results show that the synthetic Ti-doped sapphire sample with obvious purple could change to the synthetic pink sapphire heat-treated for 48 hours at 1 920 to 1 995℃ and in the reducing atmosphere of hydrogen,whose colour is similar to that of the padparadscha sapphire.Finally,the gemmological characteristics of the synthetic pink sapphire sample are also analysed by using the conventional testing and energy-dispersive X-ray fluorescence spectrometry.
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Keywords:
- synthetic pink sapphire /
- Ti3+ /
- ion valence /
- colour
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[1] 蓝宝石:美丽不只是蓝色[EB/OL].http://www.gemstone.org/gem-by-gem/chinese/saphire_fancy.html,2007-07-03. [2] 中国地质大学精品课程系列:第十章[EB/OL].http://unit.cug.edu.cn/2007jpkc/bsxgj1/jpkc/dzja.html,2008-01-01. [3] 陈庆汉,周庆模,黄晋蓉,等.钛宝石的晶体生长与性能[J].激光技术,1993,17(2):107—111. [4] 木村茂行,小玉展宏,北村健二,等.优质钛宝石单晶制造方法[P].日本专利:63-274694,1988. [5] M R Kokta.Process for enhancing Ti∶Al2O3tunable lasercrystal fluorescence by annealing[P].US Patent:4587035,1986.
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