Optical absorption edge in rare earth sesquisulfides

Journal Article · Thu Feb 02 04:00:00 EST 2006 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2005.07.035· OSTI ID:20891634

Forster, Cheryl M ^[1]; White, William B ^[1]

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1. Materials Research Institute, Pennsylvania State University, University Park, PA 16802 (United States)

Optical absorption edge spectra have been measured by diffuse reflectance spectroscopy on a complete suite of rare earth sesquisulfide compounds of varying structure type. Optical band gaps were extracted from these data. The observed band gaps tend to vary with crystal structure type but many compounds with the same structure have similar band gaps independently of the particular rare earth ion. The ordered {alpha}-structure has a substantially lower band gap than the defect {gamma}-structure for all compounds examined except for La{sub 2}S{sub 3}.

• OSTI ID: 20891634
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 41; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
LANTHANUM SULFIDES
OPTICAL PROPERTIES
RARE EARTHS
SPECTROSCOPY