High-pressure study of low-compressibility Ta2N

Room temperature synchrotron x-ray diffraction experiments were performed on nanocrystal Ta2N in a diamond anvil cell to a pressure of 55.48 GPa. This nitride is a well-known kind of high-hardness material, and it is found to be highly incompressible. The structure is stable with no phase transition...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2007-10, Vol.19 (42), p.425233-425233 (6)
Main Authors: Lei, W W, Liu, D, Li, X F, Zhang, J, Zhou, Q, Hu, J Z, Cui, Q L, Zou, G T
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
DIAMONDS
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Mechanical and acoustical properties of condensed matter
Mechanical properties of nanoscale materials
national synchrotron light source
NITRIDES
PARTICLE ACCELERATORS
Physics
PRESSURE RANGE
Specific phase transitions
Structural transitions in nanoscale materials
SYNCHROTRONS
X-RAY DIFFRACTION
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Summary:Room temperature synchrotron x-ray diffraction experiments were performed on nanocrystal Ta2N in a diamond anvil cell to a pressure of 55.48 GPa. This nitride is a well-known kind of high-hardness material, and it is found to be highly incompressible. The structure is stable with no phase transitions observed in this pressure range. The zero-pressure bulk modulus and its pressure derivative at ambient pressure are B0 = 360 +/- 3 GPa, B0' = 4, and in room conditions, the a and c parameters are 3.054 A, 4.996 A, respectively. The bulk modulus of Ta2N is greater than those of TaC, epsilon-TaN, Cr2N and MoN. The differences in bulk moduli might be due to the differences in structure and the cohesive energy among these phases.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/19/42/425233