High-pressure generation by a multiple anvil system with sintered diamond anvils and study of pressure measurement

(1)用烧结金刚石多砧系统产生高压。二级MA 8高压系统顶锤采用烧结金刚石顶锤，一级MA 6高压系统顶锤采用硬质合金顶锤。烧结金刚石块（SYNDAX L555，De Beers Diamond Co. Ltd）与碳化硅烧结，因此，复合材料对X射线束具有优异的透明度。将烧结的金刚石抛光以形成立方体，并且将其角部截短以形成MA 8设备的砧头。截断边长为0.5 mm和1.0 mm。对于TEL= 1.0mm的顶锤，氧化镁压力介质的八面体边长为3.4mm。通过测量金的晶格常数来确定所产生的压力。对于TEL= 1.0mm，产生的压力高达28 GPa，对于TEL=0.5mm，产生的压力高达41 GPa。(2)为了在更大的体积中获得更高的压力，我们必须明确三个因素，即1）大的力， ...更多信息 2）材料强度高，3）强度的压力导数大。烧结金刚石块（SYNDIE，1285/D27，De Beers Diamond Co. Ltd）被抛光以形成立方体，并且它们的角被截断以形成MA 8设备的砧头。抛光后的烧结金刚石立方体的边具有8.45mm的长度。用于本发明的砧座的截短边缘长度（TEL）为2 mm。在这种情况下，很容易产生高达28 GPa的压力（Fe 85%V%15 α-相变），但砧头的压力增加到6 GPa，因此，不可能增加压力。(3)64型高压装置本实验所用的高压系统由八个模块组成。一个块体由一个烧结金刚石顶锤（8.45mm）和7个WC立方体顶锤（8 mm）组成。金属垫圈被放置在一个维尔斯之间。系统按DIA-30。根据Fe 80%V 20%的电阻最低点，获得了超过35 GPa的压力。少

(1) High-pressure generation by a multiple anvil system with sintered diamond. Sintered diamonds are employed for the anvil of second-stage MA8 high pressure system and the anvil of fist stage is used tungsten carbide anvil for MA6 system. The sintered diamond blocks (SYNDAX L555, De Beers Diamond Co. Ltd) are cemented with silicon carbide, therefore, the composites have excellent transparency for the x-ray beam. The sintered diamonds are polished to form cubes and their corner are truncated to form the anvil head of the MA8 apparatus. The truncated edge lengths are 0.5 and l.0mm. The edge length of the octahedron of the magnesia pressure medium is 3.4mm for the anvil with TEL=l.0mm. The pressure generated was determined by measuring the lattice constant of gold. Pressures generated up to 28GPa for TEL=l.0mm and 41GPa for TEL=0.5mm.(2) High pressure generation In large volume In order to attain higher pressure in larger volume, we have to clear three factors, that is, 1) the large forc … More e utilized, 2) high strength of material, and also 3) the large pressure derivative of strength. The no bander sintered diamond can be clear the three factors, but it is not possible to get it. The sintered diamond blocks (SYNDIE, 1285/D27, De Beers Diamond Co. Ltd) are polished to form cubes, and their corners are truncated to form the anvil head of the MA8 apparatus. A side of a sintered diamond cube after polishing has 8.45mm in length. The truncated edge length(TEL)of the anvil used for the present is 2mm. In this case, it is easy to generate pressure up to 28GPa(Fe85%V%15 alpha - epsilon transition), but press of the anvil head increase up to 6GPa, therefore, it is not possible to increase pressure.(3) 64-type high pressure apparatus The high pressure system used present experimentare constituted with eight blocks. A block is consisted with one sintered diamond anvile (8.45mm) and 7 pieces of WC cubic(8mm) anvils. Metal gaskets are put in between the an vils. The system is pressed by DIA-30. Pressures in excess of 35GPa were obtained on the basis of minimum point of electrical resistance of the Fe80%V20%. Less