Graphite to diamond-like carbon phase transformation by high-pressure torsion

Kaveh Edalati; Takeshi Daio; Yoshifumi Ikoma; Makoto Arita; Zenji Horita

doi:10.1063/1.4816082

Graphite to diamond-like carbon phase transformation by high-pressure torsion

Kaveh Edalati, Takeshi Daio, Yoshifumi Ikoma, Makoto Arita, Zenji Horita

Advanced Energy Conversion Systems Thrust

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

26 Citations (Scopus)

Abstract

Diamond-like carbon (DLC) with significant fraction of tetrahedral sp ³ bonds and amorphous structure is generally produced in the form of thin films by rapid cooling of high-energy carbon atoms in vacuum. This study shows that DLC can be directly formed from bulk samples of graphite by application of severe plastic deformation under high pressures. The formation of DLC is enhanced with increasing the shear strain, pressure, and temperature. It is suggested that the high pressure thermodynamically stabilize DLC and formation of high density of lattice defects by straining reduces the energy barrier for DLC formation.

Original language	English
Article number	034108
Journal	Applied Physics Letters
Volume	103
Issue number	3
DOIs	https://doi.org/10.1063/1.4816082
Publication status	Published - Jul 15 2013

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4816082

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title = "Graphite to diamond-like carbon phase transformation by high-pressure torsion",

abstract = "Diamond-like carbon (DLC) with significant fraction of tetrahedral sp 3 bonds and amorphous structure is generally produced in the form of thin films by rapid cooling of high-energy carbon atoms in vacuum. This study shows that DLC can be directly formed from bulk samples of graphite by application of severe plastic deformation under high pressures. The formation of DLC is enhanced with increasing the shear strain, pressure, and temperature. It is suggested that the high pressure thermodynamically stabilize DLC and formation of high density of lattice defects by straining reduces the energy barrier for DLC formation.",

author = "Kaveh Edalati and Takeshi Daio and Yoshifumi Ikoma and Makoto Arita and Zenji Horita",

note = "Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan, in Innovative Areas “Bulk Nanostructured Metals.”",

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T1 - Graphite to diamond-like carbon phase transformation by high-pressure torsion

AU - Edalati, Kaveh

AU - Daio, Takeshi

AU - Ikoma, Yoshifumi

AU - Arita, Makoto

AU - Horita, Zenji

N1 - Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan, in Innovative Areas “Bulk Nanostructured Metals.”

PY - 2013/7/15

Y1 - 2013/7/15

N2 - Diamond-like carbon (DLC) with significant fraction of tetrahedral sp 3 bonds and amorphous structure is generally produced in the form of thin films by rapid cooling of high-energy carbon atoms in vacuum. This study shows that DLC can be directly formed from bulk samples of graphite by application of severe plastic deformation under high pressures. The formation of DLC is enhanced with increasing the shear strain, pressure, and temperature. It is suggested that the high pressure thermodynamically stabilize DLC and formation of high density of lattice defects by straining reduces the energy barrier for DLC formation.

AB - Diamond-like carbon (DLC) with significant fraction of tetrahedral sp 3 bonds and amorphous structure is generally produced in the form of thin films by rapid cooling of high-energy carbon atoms in vacuum. This study shows that DLC can be directly formed from bulk samples of graphite by application of severe plastic deformation under high pressures. The formation of DLC is enhanced with increasing the shear strain, pressure, and temperature. It is suggested that the high pressure thermodynamically stabilize DLC and formation of high density of lattice defects by straining reduces the energy barrier for DLC formation.

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Graphite to diamond-like carbon phase transformation by high-pressure torsion

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