High pressure studies using two-stage diamond micro-anvils grown by chemical vapor deposition

Journal Article · Wed Jun 10 00:00:00 EDT 2015 · High Pressure Research

DOI:https://doi.org/10.1080/08957959.2015.1053881· OSTI ID:1251190

Vohra, Yogesh K. ^[1]; Samudrala, Gopi K. ^[1]; Moore, Samuel L. ^[1]; Montgomery, Jeffrey M. ^[1]; Tsoi, Georgiy M. ^[1]; Velisavljevic, Nenad ^[2]

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1. Univ. of Alabama at Birmingham, Birmingham, AL (United States)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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 μm culet and with a CVD diamond second stage of 50 μm 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 86 GPa. Furthermore, the micro-anvil grown by CVD remained intact during indentation of gasket as well as on decompression from the highest pressure of 86 GPa.

• Research Organization: Univ. of Alabama, Birmingham, AL (United States); Carnegie Institution of Washington, Washington, D.C. (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Legacy Management (LM), Office of Field Operations
• Grant/Contract Number: NA0002014; NA0002006
• OSTI ID: 1251190
• Alternate ID(s): OSTI ID: 1335881
• Journal Information: High Pressure Research, Vol. 35, Issue 3; ISSN 0895-7959
• Publisher: Taylor & Francis
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
high pressure techniques
diamond growth
micro X-ray diffraction
rare-earth metals
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
micro x-ray diffraction
rare earth metals