Terapascal static pressure generation with ultrahigh yield strength nanodiamond.
Terapascal static pressure generation with ultrahigh yield strength nanodiamond.
复制标题
超高屈服强度纳米座量的Terapascal静压产生。
DOI：
10.1126/sciadv.1600341
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发表时间：
2016-07
期刊：
影响因子：
13.6
通讯作者：
Snigirev A
中科院分区：
文献类型：
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作者：
Dubrovinskaia N;Dubrovinsky L;Solopova NA;Abakumov A;Turner S;Hanfland M;Bykova E;Bykov M;Prescher C;Prakapenka VB;Petitgirard S;Chuvashova I;Gasharova B;Mathis YL;Ershov P;Snigireva I;Snigirev A
由于纳米晶金刚石微球的实施，在实验室中能够产生太帕斯卡的静压。对材料在高压和超高压下的性质的研究导致了独特的物理和化学现象的发现以及对物质的更深入的理解。在高压研究中，可实现的静压极限由可用的坚固材料的强度和高压装置的设计施加。利用高压高温技术合成了具有光学透明性的块状纳米金刚石微球，由于块状纳米金刚石独特的微观结构，使其具有优异的屈服强度（在~70 GPa的围压下~460 GPa）。我们使用纳米金刚石球在一个双阶段的金刚石砧单元高压装置，使我们能够产生超过1 TPa的静压，如同步辐射X射线衍射所示。出色的机械性能（应变弹性，非常高的硬度和前所未有的屈服强度）使纳米金刚石球成为一种独特的设备，用于产生超静压力。结构各向同性，均匀，并由低Z材料制成，它们在X射线光学应用领域很有前途。
Terapascal static pressure generation is enabled in laboratory due to implementation of nanocrystralline diamond microballs. Studies of materials’ properties at high and ultrahigh pressures lead to discoveries of unique physical and chemical phenomena and a deeper understanding of matter. In high-pressure research, an achievable static pressure limit is imposed by the strength of available strong materials and design of high-pressure devices. Using a high-pressure and high-temperature technique, we synthesized optically transparent microballs of bulk nanocrystalline diamond, which were found to have an exceptional yield strength (~460 GPa at a confining pressure of ~70 GPa) due to the unique microstructure of bulk nanocrystalline diamond. We used the nanodiamond balls in a double-stage diamond anvil cell high-pressure device that allowed us to generate static pressures beyond 1 TPa, as demonstrated by synchrotron x-ray diffraction. Outstanding mechanical properties (strain-dependent elasticity, very high hardness, and unprecedented yield strength) make the nanodiamond balls a unique device for ultrahigh static pressure generation. Structurally isotropic, homogeneous, and made of a low-Z material, they are promising in the field of x-ray optical applications.