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Your search keyword '"Vlahos, E."' showing total 2 results
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2 results on '"Vlahos, E."'

1. Tunable band gap in Bi(Fe1-xMnx)O3 films.

Author

Xu, X. S., Ihlefeld, J. F., Lee, J. H., Ezekoye, O. K., Vlahos, E., Ramesh, R., Gopalan, V., Pan, X. Q., Schlom, D. G., and Musfeldt, J. L.

Subjects
*THIN films, *OPTICAL properties, *FERROELECTRIC thin films, *SOLID state electronics, *SOLID solutions, *TUNABLE lasers, *OXIDES
Abstract

In order to investigate band gap tunability in polar oxides, we measured the optical properties of a series of Bi(Fe1-xMnx)O3 thin films. The absorption response of the mixed metal solid solutions is approximately a linear combination of the characteristics of the two end members, a result that demonstrates straightforward band gap tunability in this system. [ABSTRACT FROM AUTHOR]

Published
2010
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2. Optical properties of quasi-tetragonal BiFeO3 thin films.

Author

Chen, P., Podraza, N. J., Xu, X. S., Melville, A., Vlahos, E., Gopalan, V., Ramesh, R., Schlom, D. G., and Musfeldt, J. L.

Subjects
*THIN films, *OPTICAL properties, *CHARGE transfer, *ELLIPSOMETRY, *ULTRAVIOLET spectroscopy, *BISMUTH compounds, *FERRITES, *ELECTRONIC excitation
Abstract

Optical transmission spectroscopy and spectroscopic ellipsometry were used to extract the optical properties of an epitaxially grown quasi-tetragonal BiFeO3 thin film in the near infrared to near ultraviolet range. The absorption spectrum is overall blue shifted compared with that of rhombohedral BiFeO3, with an absorption onset near 2.25 eV, a direct 3.1 eV band gap, and charge transfer excitations that are ∼0.4 eV higher than those of the rhombohedral counterpart. We interpret these results in terms of structural strain and local symmetry breaking. [ABSTRACT FROM AUTHOR]

Published
2010
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