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diamond.synthesis from a system of chromium-carbide andNi_(70)Mn_(25)Co_5 alloy

Chinese Science Bulletin 1998年第24期43卷 2063-2066页

作者： LI Liangbin 1, JIANG Jinchun 1, HONG Shiming 1, ZHONG Yumao 2 and ZHANG Xinyuan 2 1. Institute of Applied Physics, Sichuan Union University, Chengdu 610065, China 2. Center for Analysis and Test, Sichuan Union University, Chengdu 610065, China Institute of Applied Physics Sichuan Union University Chengdu China Center for Analysis and Test Sichuan Union University Chengdu China

In order to ascertain the mechanism of interaction between carbide and metallic catalyst and formation of diamond.under high pressure and high temperature, and find a new method to synthesize diamond.with special properties, it is necessary to investigate the reaction behavior of different carbides and metallic solvent_catalysts under high pressure and high temperature. A system of Cr-3C-2 powder and Ni 70Mn 25Co 5 alloy in weight ratio of 1∶6 was treated under 6 0 GPa and 1 500℃ for 20, 30 or 60 min respectively. X_ray diffraction of the samples indicated the Cr 3C 2 decomposed partially after high pressure and temperature treatment, and Cr 7C 3, Cr and diamond.formed respectively. There was not any trace of graphite in the samples. The result suggested that the separated carbon atoms could form diamond.directly without conversion process of graphite into diamond. The observation of SEI, WDX and EDX also showed that diamond.crystals were synthesized in the system, which have perfect surfaces and shapes, with the average grain size of about 40 μm. The properties of the crystals are being investigated.

关键词： chromium_carbide high pressure synthesis diamond.

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diamond. FROM HIGH-PRESSURE METAMORPHIC ROCKS IN EASTERN DABIE MOUNTAIN

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Chinese Science Bulletin 1992年第2期37卷 140-145页

作者：徐树桐苏文刘贻灿江来利季寿元 A.I.OKAY A.M.C.SENGOR Anhui Institute of Geology Hefei 210001 PRC Department of Earth Science Nanjing University Nanjing 210008 PRC Department of Geology Istanbul Technical University Turkey (Department of Geology Istanbul Technical University Turkey

diamond. commonly occur in kimberlites, lamproites and relative alluvial sediments. Some examples of diamond. discovered in ultramafics have heen reported. Sobolev and Shatsky reported diamond. from high-pressure metamorphic rock from northern Kazakhstan and considered it to be the source of the alluvial diamond. in Pridneprovie region of western U. S. S. R. diamond. reported here show some similarity to those in northern Kazakhstan, and are the second occurrence in the world, but the first one in China.

关键词： coesite jadeite diamond.

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Developments in the Detection of Current HPHT and CVD Synthetics

Developments in the Detection of Current HPHT and CVD Synthe...

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2015中国珠宝首饰学术交流会

作者： David Fisher De Beers Technologies Belmont RoadMaidenheadSL6 6JWUK

Recent changes in the properties of both HPHT and CVD synthetics will require changes in the way identification criteria are *** Beers continually develops the Verification Instruments it produces to respond to these *** Automated Melee Screening instrument provides screening capability for melee sized synthetic stones and the introduction of filtering into the latest version of the diamond.iew?instrument has enhanced its capability for the identification of both HPHT and CVD synthetics.

关键词： HTHP CVD synthetics diamond.

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抒发九种情绪,生动表达情感

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疯狂英语（新策略） 2022年第8期 51-57页

作者：朱红江苏

一、开心喜悦The smile on her face shone like a diamond.她脸上的笑容像钻石一样闪闪发光。A smile of understanding flashed across his face.他脸上露出了一种理解的微笑。A ripple of excitement ran through them.一阵兴奋的涟... 详细信息

关键词： smile flash diamond.

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