Pressure generation in a 6-8-2 type multi-anvil system: a performance test for third-stage anvils with various diamonds
Pressure generation in a 6-8-2 type multi-anvil system: a performance test for third-stage anvils with various diamonds
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DOI：
10.1080/08957950802246530
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发表时间：
2008-09
影响因子：
2
通讯作者：
T. Kunimoto;T. Irifune;H. Sumiya
中科院分区：
文献类型：
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作者：
T. Kunimoto;T. Irifune;H. Sumiya
我们开发了一种用于多砧装置的6-8-2单元，其中一对金刚石棒用作压力增强器。我们测试了单晶金刚石（SCD）、常规烧结金刚石（SD）和纳米多晶金刚石（NPD）作为6-8-2系统的第三阶段砧。进行了原位X射线衍射实验以测试本电池的性能，并且在室温下在700吨的压力载荷下确认了1.90GPa的压力产生，而不管砧材料的差异。然而，在加热样品时，当SCD和SD用作第三阶段砧时，压力随着温度>800 K的升高而显著下降，并且由于砧的显著塑性变形，最终在1400 K下下降到20-30 GPa。相比之下，当使用NPD砧时，在高达1250 K的温度下保持80-90 GPa的压力。在更高的温度下，压力显着下降，但仍然高于（1400 K时，约55 GPa），比使用SCD和SD砧所观察到的。NPD顶锤的塑性变形明显小于其他顶锤，表明NPD顶锤是6-8-2系统最合适的顶锤材料。
We developed a 6-8-2 cell for multi-anvil apparatus, where a pair of diamond rods are used as a pressure intensifier. We tested single crystal diamond (SCD), conventional sintered diamond (SD), and nano-polycrystalline diamond (NPD) as the third-stage anvils for the 6-8-2 system. In situ X-ray diffraction experiments were conducted to test the performance of the present cell, and pressure generation of ∼ 90 GPa was confirmed at a press load of 700 tons at room temperature, regardless of the difference in anvil material. Upon the heating of the sample, however, the pressure substantially dropped with increasing temperature>800 K when SCD and SD were used as third-stage anvils, and ultimately decreased to 20–30 GPa at 1400 K due to significant plastic deformation of the anvils. In contrast, pressures of 80–90 GPa were maintained at temperatures up to ∼ 1250 K when the NPD anvils were used. The pressure decreased significantly at still higher temperatures, but remained higher (∼ 55 GPa, at 1400 K) than those observed by using SCD and SD anvils. The plastic deformation of the NPD anvils was obviously smaller than that of the other anvils, suggesting that NPD is the most suitable anvil material for the 6-8-2 system.