Elastic constants of single-crystal Ti Nx (001) (0.67≤x≤1.0) determined as a function of x by picosecond ultrasonic measurements

Taeyoon Lee; K. Ohmori; C. S. Shin; David G. Cahill; I. Petrov; J. E. Greene

doi:10.1103/PhysRevB.71.144106

Elastic constants of single-crystal Ti Nx (001) (0.67≤x≤1.0) determined as a function of x by picosecond ultrasonic measurements

Taeyoon Lee, K. Ohmori, C. S. Shin, David G. Cahill, I. Petrov, J. E. Greene

Research output: Contribution to journal › Article › peer-review

Abstract

The elastic constants c11 and c44 of single-crystal NaCl-structure δ-TiNx (001) layers, with x ranging from 0.67 to 1.0, were determined using sound velocity measurements. Picosecond ultrasonic optical pump/probe techniques were employed to generate and detect longitudinal sound waves and surface acoustic waves (SAW) in order to obtain c11 (x) and c44 (x), respectively. SAW generation was achieved by depositing a periodic series of Al bars on the Ti Nx (001) layers to spatially modulate the surface reflectivity. c11 and c44 were found to decrease continuously from 626 and 156 GPa with x=1 to 439 and 92 GPa with x=0.67. The Voit-Reuss-Hill average aggregate elastic moduli EVRH (x) obtained from our measured c11 (x) and c44 (x) values are in good agreement with previous Ti Nx (001) nanoindentation results.

Original language	English (US)
Article number	144106
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	71
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.71.144106
State	Published - 2005

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Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Elastic constants of single-crystal Ti Nx (001) (0.67≤x≤1.0) determined as a function of x by picosecond ultrasonic measurements",

abstract = "The elastic constants c11 and c44 of single-crystal NaCl-structure δ-TiNx (001) layers, with x ranging from 0.67 to 1.0, were determined using sound velocity measurements. Picosecond ultrasonic optical pump/probe techniques were employed to generate and detect longitudinal sound waves and surface acoustic waves (SAW) in order to obtain c11 (x) and c44 (x), respectively. SAW generation was achieved by depositing a periodic series of Al bars on the Ti Nx (001) layers to spatially modulate the surface reflectivity. c11 and c44 were found to decrease continuously from 626 and 156 GPa with x=1 to 439 and 92 GPa with x=0.67. The Voit-Reuss-Hill average aggregate elastic moduli EVRH (x) obtained from our measured c11 (x) and c44 (x) values are in good agreement with previous Ti Nx (001) nanoindentation results.",

author = "Taeyoon Lee and K. Ohmori and Shin, {C. S.} and Cahill, {David G.} and I. Petrov and Greene, {J. E.}",

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doi = "10.1103/PhysRevB.71.144106",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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T1 - Elastic constants of single-crystal Ti Nx (001) (0.67≤x≤1.0) determined as a function of x by picosecond ultrasonic measurements

AU - Lee, Taeyoon

AU - Ohmori, K.

AU - Shin, C. S.

AU - Cahill, David G.

AU - Petrov, I.

AU - Greene, J. E.

PY - 2005

Y1 - 2005

N2 - The elastic constants c11 and c44 of single-crystal NaCl-structure δ-TiNx (001) layers, with x ranging from 0.67 to 1.0, were determined using sound velocity measurements. Picosecond ultrasonic optical pump/probe techniques were employed to generate and detect longitudinal sound waves and surface acoustic waves (SAW) in order to obtain c11 (x) and c44 (x), respectively. SAW generation was achieved by depositing a periodic series of Al bars on the Ti Nx (001) layers to spatially modulate the surface reflectivity. c11 and c44 were found to decrease continuously from 626 and 156 GPa with x=1 to 439 and 92 GPa with x=0.67. The Voit-Reuss-Hill average aggregate elastic moduli EVRH (x) obtained from our measured c11 (x) and c44 (x) values are in good agreement with previous Ti Nx (001) nanoindentation results.

AB - The elastic constants c11 and c44 of single-crystal NaCl-structure δ-TiNx (001) layers, with x ranging from 0.67 to 1.0, were determined using sound velocity measurements. Picosecond ultrasonic optical pump/probe techniques were employed to generate and detect longitudinal sound waves and surface acoustic waves (SAW) in order to obtain c11 (x) and c44 (x), respectively. SAW generation was achieved by depositing a periodic series of Al bars on the Ti Nx (001) layers to spatially modulate the surface reflectivity. c11 and c44 were found to decrease continuously from 626 and 156 GPa with x=1 to 439 and 92 GPa with x=0.67. The Voit-Reuss-Hill average aggregate elastic moduli EVRH (x) obtained from our measured c11 (x) and c44 (x) values are in good agreement with previous Ti Nx (001) nanoindentation results.

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DO - 10.1103/PhysRevB.71.144106

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Elastic constants of single-crystal Ti Nx (001) (0.67≤x≤1.0) determined as a function of x by picosecond ultrasonic measurements

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