Nanocrystalline diamond micro-anvil grown on single crystal diamond as a generator of ultra-high pressures

• Published in: AIP advances Vol. 6; no. 9; pp. 095027 - 095027-6
• Main Authors: Samudrala, Gopi K., Moore, Samuel L., Velisavljevic, Nenad, Tsoi, Georgiy M., Baker, Paul A., Vohra, Yogesh K.
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 01.09.2016; American Institute of Physics (AIP); AIP Publishing LLC
• Subjects: Anvils; Chemical vapor deposition; Crystal growth; Diamond anvil cells; Diamonds; MATERIALS SCIENCE; Microwave plasmas; Organic chemistry; Osmium; Single crystals; Transition metals; Tungsten
• ISSN: 2158-3226; 2158-3226
• DOI: 10.1063/1.4964299

By combining mask-less lithography and chemical vapor deposition (CVD) techniques, a novel two-stage diamond anvil has been fabricated. A nanocrystalline diamond (NCD) micro-anvil 30   μ m in diameter was grown at the center of a [100]-oriented, diamond anvil by utilizing microwave plasma CVD method. The NCD micro-anvil has a diamond grain size of 115 nm and micro-focused Raman and X-ray Photoelectron spectroscopy analysis indicate sp3-bonded diamond content of 72%. These CVD grown NCD micro-anvils were tested in an opposed anvil configuration and the transition metals osmium and tungsten were compressed to high pressures of 264 GPa in a diamond anvil cell.