Elastic Moduli and Strength of Nanocrystalline Cubic BC2N from X-ray Diffraction Under Nonhydrostatic Compression

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.79.014105· OSTI ID:980174

Dong, H; He, D; Duffy, T; Zhao, Y

The stress behavior of nanocrystalline cubic boron carbon nitride (c-BC2N) was investigated using radial and axial x-ray diffractions in the diamond-anvil cell under nonhydrostatic compression up to {approx}100 GPa. The radial x-ray diffraction (RXRD) data yield a bulk modulus K0=276{+-}20 GPa with a fixed pressure derivative K0{prime}=3.4 at {psi}=54.7, which corresponds to the hydrostatic compression curve. The bulk modulus obtained from axial x-ray diffraction (AXRD) gives a value of 420{+-}11 GPa. A comparative study of the observed compression curves from radial and axial diffractions shows that the ruby-fluorescence pressure scale may reflect the maximum stress under nonhydrostatic compression. It was found that nanocrystalline c-BC2N sample could support a maximum differential stress of {approx}38 GPa when it started to yield at {approx}66 GPa under uniaxial compression. Moreover, the aggregate elastic moduli of the nanocrystalline c-BC2N have been determined from the RXRD data at high pressures.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 980174
• Report Number(s): BNL--93092-2010-JA
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Vol. 79; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BORON
CARBON NITRIDES
COMPRESSION
HYDROSTATICS
X-RAY DIFFRACTION
national synchrotron light source