High pressure studies using two-stage diamond micro-anvils grown by chemical vapor deposition
High pressure studies using two-stage diamond micro-anvils grown by chemical vapor deposition
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DOI：
10.1080/08957959.2015.1053881
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发表时间：
2015-07-03
影响因子：
2
通讯作者：
Velisavljevic, Nenad
中科院分区：
文献类型：
--
作者：
Vohra, Yogesh K.;Samudrala, Gopi K.;Velisavljevic, Nenad
超高静压已在实验室中实现，使用两级微球纳米金刚石砧以及两级微成对金刚石砧加工使用聚焦离子束系统。迄今为止实施的两级金刚石砧的设计受到在极端条件下一个金刚石砧滑过另一个砧的限制。我们描述了一种新的方法，制造两个阶段的金刚石微砧使用钨掩模上的标准金刚石砧，然后微波等离子体化学气相沉积（CVD）同质外延金刚石生长。制造了具有300 μ m底脚和直径为50 μ m的CVD金刚石第二级的原型两级金刚石砧。我们用铜压力标准对一个稀土金属镥样品进行了初步的高压X射线衍射研究。CVD法生长的微压砧在垫片压痕过程中以及从最高压力86GPa减压时保持完整。
Ultra-high static pressures have been achieved in the laboratory using a two-stage micro-ball nanodiamond anvils as well as a two-stage micro-paired diamond anvils machined using a focused ion-beam system. The two-stage diamond anvils' designs implemented thus far suffer from a limitation of one diamond anvil sliding past another anvil at extreme conditions. We describe a new method of fabricating two-stage diamond micro-anvils using a tungsten mask on a standard diamond anvil followed by microwave plasma chemical vapor deposition (CVD) homoepitaxial diamond growth. A prototype two-stage diamond anvil with 300 mu m culet and with a CVD diamond second stage of 50 mu m in diameter was fabricated. We have carried out preliminary high pressure X-ray diffraction studies on a sample of rare-earth metal lutetium sample with a copper pressure standard to 86GPa. The micro-anvil grown by CVD remained intact during indentation of gasket as well as on decompression from the highest pressure of 86GPa.