X-ray diffraction studies using diamond coated rhenium gasket to megabar pressures

Conference · Thu Sep 30 00:00:00 EDT 1999

OSTI ID:12222

Akella, J ^[1]; Catledge, S A; Chesnut, G N; Prokop, H; Vohra, Y K; Weir, S T

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1. LLNL

X-ray diffraction studies at megabar pressures are limited by the sample thickness between the diamond anvils. High strength gaskets are desirable to improve the quality of x-ray diffraction data. We present a technique which employs a microwave plasma chemical vapor deposited diamond layer on one side of a rhenium gasket. As a test case, we show energy dispersive x-ray diffraction data on rare earth metal neodymium to 153 GPa using a synchrotron source. The increased sample thickness results in an unambiguous crystal structure determination of a monoclinic phase in neodymium above 75 GPa. [chemical vapor deposition, diamond, rhenium gasket, x-ray diffraction, neodymium]

• Research Organization: Lawrence Livermore National Lab., CA (US)
• Sponsoring Organization: USDOE Office of Defense Programs (DP) (US)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 12222
• Report Number(s): UCRL-JC-133812; DP0102012; DP0102012
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CHEMICAL VAPOR DEPOSITION
CRYSTAL STRUCTURE
DESIGN
DIAMONDS
GASKETS
NEODYMIUM
RHENIUM
SYNCHROTRON RADIATION
THICKNESS
VERY HIGH PRESSURE
X-RAY DIFFRACTION
X-RAY DIFFRACTOMETERS