Recent advances of high-pressure generation in a multianvil apparatus using sintered diamond anvils

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• 作者：Shuangmeng  ; Zhai^a ;   ; ^{zhai@pku.edu.cn} ; Eiji  ; Ito^b
• 关键词：Pressure generation ; Sintered diamond anvil ; Multianvil apparatus
• 刊名：Geoscience Frontiers
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：2
• 期：1
• 页码：101-106
• 全文大小：547 K

文摘

The tried and tested multianvil apparatus has been widely used for high-pressure and high-temperature experimental studies in Earth science. As a result, many important results have been obtained for a better understanding of the components, structure and evolution of the Earth. Due to the strength limitation of materials, the attainable multianvil pressure is generally limited to about 30?GPa (corresponding to about 900?km of the depth in the Earth) when tungsten carbide cubes are adopted as second-stage anvils. Compared with tungsten carbide, the sintered diamond is a much harder material. The sintered diamond cubes were introduced as second-stage anvils in a 6? type multianvil apparatus in the 1980s, which largely enhanced the capacity of pressure generation in a large volume press. With the development of material synthesis and processing techniques, a large sintered diamond cube (14?mm) is now available. Recently, maximum attainable pressures reaching higher than 90?GPa (corresponding to about 2700?km of the depth in the Earth) have been generated at room temperature by adopting 14-mm sintered diamond anvils. Using this technique, a few researches have been carried out by the quenched method or combined with synchrotron radiation in situ observation. In this paper we review the properties of sintered diamond and the evolution of pressure generation using sintered diamond anvils. As-yet unsolved problems and perspectives for uses in Earth Science are also discussed.