HPHT Treatment Technology of Diamond
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摘要: 天然Ⅰa型褐色钻石在高温高压条件下通过加载塑性变形的强度，促进晶体内部位错的增殖和滑移，使钻石由褐色改变为黄绿色;高温高压有助于Ⅱa型褐色钻石克服其所处的势垒，促使钻石中的位错发生攀移、重组、湮灭，使之修复至塑性变形前的初始稳定状态，并最大限度地恢复其原本无色的面貌。天然灰色钻石在高温高压条件下发生了石墨—钻石的同质多象转变，微细石墨包裹体消失，灰色调消除，钻石透明度显著增强Abstract: High pressure and high temperature (HPHT) intensify the plastic deformation of natural Ⅰa brown diamonds and make the dislocation in the crystal multiply and slippage, thus the brown transforms into the yellow-green. HPHT provide the lattice defects in Ⅱa brown diamonds with sufficient potential energy for movement, recombination and annihilation, and restore them to the stable state and original colourlessness. HPHT-processing of the natural gray diamonds containing graphite and a new model of the colour enhancement are proposed. It is proposed that there occurs a polymorphous transformation from graphite inclusions to diamonds during HPHT-processing. As a result, microscopic graphite inclusions disappear completely, thus removing the gray component and making diamond crystals more transparent (colourless).
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[1] 池际尚,路凤香,刘永顺,等.中国原生金刚石成矿地质条件研究[M].武汉:中国地质大学出版社,1996.3-52. [2] 彭明生,林冰,彭卓伦.金刚石呈色机制初探[J].矿物岩石地球化学通报,1999,18(4):395-397. [3] 苑执中,彭明生,蒙宇飞.高温高压处理钻石的谱学研究[J].矿物学报,2002,22(4):379-382. [4] F De Weerdt,J Van Royen.Investigation of seven diamonds, HPHT treated by Nova diamonds[J].J Gemm,2000,27(4):201-208.
[5] Christopher P Smith,George Bosshart,Johann Ponahlo,et al. GE POL diamonds:before and after[J].Gems & Gemology, 2000,36(3):192-215.
[6] Ilene M Reinitz,Peter R Buerki,James E Shigley,et al.Identification of HPHT-treated yellow to green diamonds[J].Gems & Gemology,2000,36(2):128-137.
[7] Karl Schmetzer.Clues to the process used by General Electric to enhance the GE POL diamonds[J].Gems & Gemology,1999, 35(4):186-190.
[8] 亓利剑,袁心强,田亮光,等.高压高温处理条件下钻石中晶格缺陷的演化与呈色[J].宝石和宝石学杂志,2001,3(3):1-7. [9] 苑执中,彭明生,杨志军.高温高压处理改色的黄绿色金刚石[J].宝石和宝石学杂志,2000,2(2):29-30. [10] J-P Chalain,E Fritsch,H A H nni.Identification of GE POL diamonds:a second step[J].J Gemm,2000,27(2):73-78.
[11] Thomas M Moses,James E Shigley,Shane F McClure,et al. Observations on GE-Processed diamond:A photographic record[J].Gems&Gemology,1999,35(3):14-22.
[12] V G Vins,O V Kononov.A model of HPHT color enhancement mechanism in natural gray diamonds[J].Diamond and Related Materials,2003,(12):542-545.
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