Study on the HPHT synthetic diamond crystal from Fe-C(H) system and its significance
Study on the HPHT synthetic diamond crystal from Fe-C(H) system and its significance
复制标题
Fe-C(H)系HPHT人造金刚石晶体的研究及其意义
DOI：
10.1007/s11434-008-0020-3
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Peng MingSheng
中科院分区：
文献类型：
--
作者：
Su YuWei;Yang ZhiJun;Chen Jun;Lin Feng;Li HongZhong;Peng MingSheng
对Fe-C（H）系高温高压合成金刚石的晶习、显微形貌、显微成分和显微结构的研究表明，大多数金刚石具有八面体晶习。晶体主要从中心到外围逐层生长。HPHT合成金刚石的尺寸比天然金刚石小，因为它只在早期阶段经历成核和生长。在生长中后期，由于金刚石晶粒间的表面能差异导致的团聚，限制了高温高压合成金刚石的生长。由于氢的存在，降低了单个氮转化为氮对的活化能（E），并且缩短了单个氮转化为氮对的时间。因此，聚集态氮（A心）可能存在于HPHT和爆炸爆轰工艺合成的金刚石中。从世界范围来看，从氮聚集体中提取的天然金刚石形成时间为数亿年，这一点需要进一步讨论。考虑表面能影响金刚石生长的方式可以帮助理解一些剩余的问题（例如生长机制等）在高温高压合成过程中的作用，并从高温高压热力学理论上有效地解释了天然金刚石的形成。特别是氢对金刚石表面能的影响，氢可能是解释高温高压合成金刚石和天然金刚石形成的“桥梁”。
Investigations of crystal habit, micro-topographic imaging, micro-composition and micro-structural analysis of HPHT synthetic diamonds from the Fe-C(H) system indicate that most of them have an octahedral habit. The crystals grow mainly layer-to-layer from center to periphery. HPHT synthetic diamond is smaller in size than natural diamond because it only goes through nucleation and growth in the early stage. In the middle and late stages, due to the coalescence of diamond grains related to differences of surface energy, the growth of HPHT synthetic diamond is limited. The active energy (E) of transforming single nitrogen into a nitrogen-pair is lowered and the time of transforming single nitrogen into a nitrogen-pair is shortened because of the existence of hydrogen. Therefore, aggregate nitrogen (A-centers) may exist in synthetic diamond from HPHT and explosive detonation processes. It needs further discussion on a worldwide view that the time of natural diamond formation extracted from nitrogen aggregation is some hundred million years. Consideration of the way in which surface energy influences the growth of diamond can help to understand some of the remaining issues (e.g. growth mechanism, etc.) in the HPHT synthetic process and effectively explain the formation of natural diamond in terms of HPHT thermodynamic theory. Especially, it is important to pay more attention to the influence of hydrogen on surface energy in that hydrogen may be a “bridge” for explaining the formation of HPHT synthetic and natural diamond.
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DOI：
--
发表时间：
2005
期刊：
Jewellery Science and Technology
影响因子：
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作者：
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通讯作者：
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影响因子：
2.7
作者：
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影响因子：
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作者：
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影响因子：
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作者：
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