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Title: Compressibilities and phonon spectra of high-hardness transition metal-nitride materials

Abstract

We report compressibilities measured by synchrotron X-ray diffraction and phonon spectra from Raman scattering at high pressure in the diamond anvil cell (DAC) for cubic transition metal nitrides TiN{sub 1-x}, {gamma}-Mo{sub 2}N and VN{sub x}. The high-hardness metal nitride compounds have large values of the bulk modulus. B1-structured nitrides normally have no allowed first-order Raman spectra. However, they exhibit broad bands that reflect the vibrational density of states g({omega}) associated with breakdown of q=0 selection rules because of the presence of N{sup 3-} vacancies on anion sites. Peaks in g({omega}) at low frequency are identified with the longitudinal and transverse acoustic (TA) branches. The maximum in the TA band is correlated with the superconducting transition temperature in these materials (T{sub c}). In situ Raman scattering measurements in the DAC thus permit predictions of the T{sub c} variation with pressure for cubic nitrides and isostructural carbide materials.

Authors:
; ;  [1]
  1. ASU
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1007763
Resource Type:
Journal Article
Journal Name:
High Pressure Res.
Additional Journal Information:
Journal Volume: 26; Journal Issue: (2) ; 06, 2006; Journal ID: ISSN 0895-7959
Country of Publication:
United States
Language:
ENGLISH
Subject:
43 PARTICLE ACCELERATORS; ACOUSTICS; ANIONS; BREAKDOWN; CARBIDES; COMPRESSIBILITY; DIAMONDS; NITRIDES; PHONONS; RAMAN SPECTRA; SCATTERING; SELECTION RULES; SPECTRA; SYNCHROTRONS; TRANSITION ELEMENTS; TRANSITION TEMPERATURE; VACANCIES; X-RAY DIFFRACTION

Citation Formats

Shebanova, O, Soignard, E, Mcmillan, P F, and UCL). Compressibilities and phonon spectra of high-hardness transition metal-nitride materials. United States: N. p., 2010. Web. doi:10.1080/08957950600765186.
Shebanova, O, Soignard, E, Mcmillan, P F, & UCL). Compressibilities and phonon spectra of high-hardness transition metal-nitride materials. United States. https://doi.org/10.1080/08957950600765186
Shebanova, O, Soignard, E, Mcmillan, P F, and UCL). Wed . "Compressibilities and phonon spectra of high-hardness transition metal-nitride materials". United States. https://doi.org/10.1080/08957950600765186.
@article{osti_1007763,
title = {Compressibilities and phonon spectra of high-hardness transition metal-nitride materials},
author = {Shebanova, O and Soignard, E and Mcmillan, P F and UCL)},
abstractNote = {We report compressibilities measured by synchrotron X-ray diffraction and phonon spectra from Raman scattering at high pressure in the diamond anvil cell (DAC) for cubic transition metal nitrides TiN{sub 1-x}, {gamma}-Mo{sub 2}N and VN{sub x}. The high-hardness metal nitride compounds have large values of the bulk modulus. B1-structured nitrides normally have no allowed first-order Raman spectra. However, they exhibit broad bands that reflect the vibrational density of states g({omega}) associated with breakdown of q=0 selection rules because of the presence of N{sup 3-} vacancies on anion sites. Peaks in g({omega}) at low frequency are identified with the longitudinal and transverse acoustic (TA) branches. The maximum in the TA band is correlated with the superconducting transition temperature in these materials (T{sub c}). In situ Raman scattering measurements in the DAC thus permit predictions of the T{sub c} variation with pressure for cubic nitrides and isostructural carbide materials.},
doi = {10.1080/08957950600765186},
url = {https://www.osti.gov/biblio/1007763}, journal = {High Pressure Res.},
issn = {0895-7959},
number = (2) ; 06, 2006,
volume = 26,
place = {United States},
year = {2010},
month = {1}
}