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Effects of carbon in MgB2 thin films: Intrinsic or extrinsic.
- Source :
- Applied Physics Letters; 4/9/2007, Vol. 90 Issue 15, p151920-1, 3p, 1 Chart, 3 Graphs
- Publication Year :
- 2007
-
Abstract
- First-principles calculations are performed on MgB<subscript>2</subscript>, carbon doped MgB<subscript>2</subscript>, and MgB<subscript>2</subscript>C<subscript>2</subscript>. The trend of calculated lattice parameters of MgB<subscript>2</subscript> 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 MgB<subscript>2</subscript> and MgB<subscript>2</subscript>C<subscript>2</subscript> as predicted from first principles and of graphite from literature. It is concluded that the effect of carbon on the lattice parameters of MgB<subscript>2</subscript> thin films is extrinsic and due to differences of the coefficients of thermal expansion of different phases. [ABSTRACT FROM AUTHOR]
- Subjects :
- CARBON
THIN films
CHEMICAL vapor deposition
GRAPHITE
LITERATURE
PHYSICS
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 90
- Issue :
- 15
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 24804968
- Full Text :
- https://doi.org/10.1063/1.2717569