Nano inclusions in sapphire samples from Sri Lanka

被引：0
|
作者：
Jaijong, K. [1 ]
Wathanakul, P. [2 ,3 ]
Kim, Y. C. [4 ]
Choi, H. M. [4 ]
Bang, S. Y. [1 ]
Choi, B. G. [1 ]
Shim, K. B. [1 ]
机构：
[1] Hanyang Univ, Div Adv Mat Sci & Engn, Seoul 133791, South Korea
[2] Kasetsart Univ, Earth Sci, Fac Sci, Bangkok 10900, Thailand
[3] Chulalongkorn Univ, Gem & Jewelry Inst Thailand GIT, Bangkok 10330, Thailand
[4] Hanmi Gemol Inst, Lab, Seoul 110390, South Korea
来源：
JOURNAL OF THE KOREAN CRYSTAL GROWTH AND CRYSTAL TECHNOLOGY | 2009年 / 19卷 / 02期
关键词：
Sapphire; Heat treatment; Nano inclusions;
D O I：
暂无
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The turbid/translucent, near colorless (milky) metamorphic sapphire samples from Sri Lanka have been characterized after the heat treatment in N-2 at 1650 degrees C. As-received sapphire specimens became bluish-colored and exhibited more clarity after the heat treatment. It was found that the color change at inclusions zoning region is attributed by the dissolution. As received samples contain the micro/nano inclusions such as rutile (TiO2), ilmenite (FeTiO3), spinel (MgAl2O4)/ulvospinel (Fe2TiO4) and apatite (Ca-5(PO4)(3)), which were dissolved by the heat treatment and form the blue color through Fe2+/Ti4+ charge transferring. The microstructures become different because as the dissolution of apatite (Ca-5(PO4)(3)(OH,F,Cl)) in alumino silicates (Al2SiO5) occurred, resulting in morphological change with the appearance of (Ca, Mg, Al) silicate on the surface. Both as -received and heat treated samples showed the rhombohedral crystal structure of Al2O3.
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页码：84 / 89
页数：6
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