Journal ArticleDOI
Self‐Activated Luminescence of M2+ Niobates and Tantalates
TLDR
Among 22 compounds examined for photoluminescence, only Mg/sub 4/Nb/sub 2/O/sub 9, CaTa, ZnTa, and Cd showed appreciable room temperature emission as mentioned in this paper.Abstract:
Among 22 compounds examined for photoluminescence, only Mg/sub 4/Nb/sub 2/O/sub 9/, CaTa/sub 2/O/sub 6/, and the metaniobates of Mg , Ca, Zn, and Cd show appreciable room temperature emission. With the exception of Mg/sub 4/Nb/sub 2/O/ sub 9/, all of these have the columbite structure; moreover, the only essentially nonluminescent columbite-type compound noted was ZnTa/sub 2/O/sub 6/. The absorption edges of the luminescent niobates lie at shorter wavelengths than those of otherwise similar compositions. This indicates a relationship between luminescence and the separation of energy states within the Nb--O bond, as influenced by structure. (auth)read more
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Book ChapterDOI
The luminescence of closed-shell transition-metal complexes. New developments
TL;DR: In this article, new developments in the understanding of the luminescence of complexes consisting of a central highly-charged transition metal ion without d electrons surrounded by a number of oxygen ions (usually 4 or 6 in a tetrahedral or octahedral arrangement, respectively).
Journal ArticleDOI
Photocatalytic water splitting into H2 and O2 over various tantalate photocatalysts
Hideki Kato,Akihiko Kudo +1 more
TL;DR: In this paper, the authors discussed the factors affecting photocatalytic activities of tantalates from a viewpoint of the crystal structure and the energy structure, and showed that NiO-loaded NaTaO 3 with the distorted perovskite structure showed the highest activity among tantalates.
Journal ArticleDOI
The Synthesis, Properties, and Applications of Columbite Niobates (M2+Nb2O6): A Critical Review
TL;DR: The binary niobate ceramics, with the formula M 2+ Nb 2 O 6 where M 2 + = Ca, Mg, or a transition metal (TM), have the orthorhombic columbite structure as discussed by the authors.
Journal ArticleDOI
Red light emitting BaNb2O6:Eu3+ phosphor for solid state lighting applications
Amit K. Vishwakarma,Kaushal Jha,M. Jayasimhadri,A.S. Rao,Kiwan Jang,B. Sivaiah,B. Sivaiah,D. Haranath +7 more
TL;DR: In this article, Eu 3+ doped barium niobate (Eu 3 + :BaNb 2 O 6 ) phosphors were successfully synthesized by conventional solid state reaction method.
Journal ArticleDOI
The influence of crystal structure on the luminescence of tantalates and niobates
TL;DR: In this article, the luminescence of MgTa/sub 2/O/sub 6/ (trirutile structure) and ZnTa/(tri-cap alpha..-PbO/Sub 2/2/6/ structure) with columbite structure was investigated and it was shown that the excitons, formed upon photoexcitation, are mobile.