Optical Properties of Bismuth Germanate (BGO)

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3272909· OSTI ID:970903

Jellison, Jr, Gerald Earle ^[1]; Auluck, S. ^[2]; Singh, David J ^[1]; Boatner, Lynn A ^[1]

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1. ORNL
2. Indian Institute of Technology, Roorkee

The optical dielectric function of bismuth germanate Bi4Ge3O12 has been measured using spectroscopic ellipsometry and optical transmission. Analysis near the direct band edge indicates that there are at least three critical points at 4.44 low intensity and at 4.75 and 4.91 high intensity. Using transmission measurements, the band gap is determined to be 4.20 eV, which is likely determined by the defects in the material. Comparisons are made with relativistic electronic structure and optical calculations based on the Engel Vosko generalized gradient approximation. The near-absorption-edge critical points are associated with spin-orbit-split bands which significantly modify the conduction bands.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 970903
• Journal Information: Journal of Applied Physics, Vol. 701, Issue 1; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH GERMANATES
DEFECTS
DIELECTRIC MATERIALS
ELECTRONIC STRUCTURE
ELLIPSOMETRY
OPTICAL PROPERTIES