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Title: Influence of crystal structure on the luminescence of tantalates and niobates

Abstract

The luminescence of MgTa/sub 2/O/sub 6/ (trirutile structure) and ZnTa/sub 2/O/sub 6/ (tri-..cap alpha..-PbO/sub 2/ structure) are reported and discussed in connection with the luminescence of related compounds, especially the niobates with columbite structure. The maximum of the excitation band of the luminescence of the two tantalates is at 280 nm, a value lower in energy than that for the niobates. The emission band has its maximum at 500 nm (MgTa/sub 2/O/sub 6/) and 450 nm (ZnTa/sub 2/O/sub 6/). The quantum efficiency is low, reaching 15% (MgTa/sub 2/O/sub 6/) and 30% (ZnTa/sub 2/O/sub 6/) at 4.2 K. It is argued that the phenomena observed for these compounds indicate that the excitons, formed upon photoexcitation, are mobile, whereas in the columbite niobates they are localized due to self-trapping.

Authors:
Publication Date:
Research Org.:
Utrecht Univ. (Netherlands)
OSTI Identifier:
7078480
Resource Type:
Journal Article
Journal Name:
J. Solid State Chem.; (United States)
Additional Journal Information:
Journal Volume: 72:1
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNESIUM COMPOUNDS; CRYSTAL STRUCTURE; OPTICAL PROPERTIES; NIOBATES; TANTALATES; ZIRCONIUM COMPOUNDS; EMISSION SPECTROSCOPY; EXPERIMENTAL DATA; LUMINESCENCE; ALKALINE EARTH METAL COMPOUNDS; DATA; INFORMATION; NIOBIUM COMPOUNDS; NUMERICAL DATA; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; REFRACTORY METAL COMPOUNDS; SPECTROSCOPY; TANTALUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties; 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies

Citation Formats

Blasse, G. Influence of crystal structure on the luminescence of tantalates and niobates. United States: N. p., 1988. Web. doi:10.1016/0022-4596(88)90010-2.
Blasse, G. Influence of crystal structure on the luminescence of tantalates and niobates. United States. https://doi.org/10.1016/0022-4596(88)90010-2
Blasse, G. 1988. "Influence of crystal structure on the luminescence of tantalates and niobates". United States. https://doi.org/10.1016/0022-4596(88)90010-2.
@article{osti_7078480,
title = {Influence of crystal structure on the luminescence of tantalates and niobates},
author = {Blasse, G},
abstractNote = {The luminescence of MgTa/sub 2/O/sub 6/ (trirutile structure) and ZnTa/sub 2/O/sub 6/ (tri-..cap alpha..-PbO/sub 2/ structure) are reported and discussed in connection with the luminescence of related compounds, especially the niobates with columbite structure. The maximum of the excitation band of the luminescence of the two tantalates is at 280 nm, a value lower in energy than that for the niobates. The emission band has its maximum at 500 nm (MgTa/sub 2/O/sub 6/) and 450 nm (ZnTa/sub 2/O/sub 6/). The quantum efficiency is low, reaching 15% (MgTa/sub 2/O/sub 6/) and 30% (ZnTa/sub 2/O/sub 6/) at 4.2 K. It is argued that the phenomena observed for these compounds indicate that the excitons, formed upon photoexcitation, are mobile, whereas in the columbite niobates they are localized due to self-trapping.},
doi = {10.1016/0022-4596(88)90010-2},
url = {https://www.osti.gov/biblio/7078480}, journal = {J. Solid State Chem.; (United States)},
number = ,
volume = 72:1,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}