Effects of carbon in MgB2 thin films

Intrinsic or extrinsic

A. Saengdeejing, J. E. Saal, Yi Wang, Zi-kui Liu

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

First-principles calculations are performed on MgB2, carbon doped MgB2, and MgB2C2. The trend of calculated lattice parameters of MgB2 with increasing carbon content agrees with bulk experiments but not with thin films produced by hybrid physical-chemical vapor deposition. In this work, the authors propose a model to explain this behavior based on the coefficients of thermal expansion of MgB2 and MgB2C2 as predicted from first principles and of graphite from literature. It is concluded that the effect of carbon on the lattice parameters of MgB2 thin films is extrinsic and due to differences of the coefficients of thermal expansion of different phases.

Original languageEnglish (US)
Article number151920
JournalApplied Physics Letters
Volume90
Issue number15
DOIs
StatePublished - Apr 24 2007

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carbon
thermal expansion
lattice parameters
thin films
coefficients
graphite
vapor deposition
trends

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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Effects of carbon in MgB2 thin films : Intrinsic or extrinsic. / Saengdeejing, A.; Saal, J. E.; Wang, Yi; Liu, Zi-kui.

In: Applied Physics Letters, Vol. 90, No. 15, 151920, 24.04.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of carbon in MgB2 thin films

T2 - Intrinsic or extrinsic

AU - Saengdeejing, A.

AU - Saal, J. E.

AU - Wang, Yi

AU - Liu, Zi-kui

PY - 2007/4/24

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AB - First-principles calculations are performed on MgB2, carbon doped MgB2, and MgB2C2. The trend of calculated lattice parameters of MgB2 with increasing carbon content agrees with bulk experiments but not with thin films produced by hybrid physical-chemical vapor deposition. In this work, the authors propose a model to explain this behavior based on the coefficients of thermal expansion of MgB2 and MgB2C2 as predicted from first principles and of graphite from literature. It is concluded that the effect of carbon on the lattice parameters of MgB2 thin films is extrinsic and due to differences of the coefficients of thermal expansion of different phases.

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