Li, Li-Ping and Li, Guang-She and Xue, Yan-Feng and Inomata, Hiroshi (2001) Structure, Luminescence, and Transport Properties of EuVO_4. Journal of the Electrochemical Society, 148 (9). J45-J49. ISSN 0013-4651 http://resolver.caltech.edu/CaltechAUTHORS:20111116-111401506
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Metastable scheelite EuVO_4 was stabilized by a high temperature and pressure method, which was transformed into a stable zircon phase by annealing treatment in air. Scheelite EuVO_4 gave strong emissions with a dominant peak at 617 nm associated with the ^(5)D_0-^(7)F_2 transition of Eu^(3+). ^(151)Eu Mössbauer spectra indicated that the isomer shift for the metastable scheelite phase was ca. 0.5 mm/s lower than that for the zircon phase, which was ascribed to a reduced covalency in the Eu-O bond originated via a charge transfer from oxygen to Eu3+ in scheelite lattice by producing an enhanced shielding of 4f electrons on the s orbital as well as a decrease in s electron density around Eu^(3+) nucleus. Impedance spectra for the zircon phase clearly demonstrated an ionic hopping in the bulk with a conductivity of ca. 1.0×10^(–3) S cm^(–1) at 500°C. EuVO_4 is proved to be both a potential phosphor and a potential ionic conductor.
|Additional Information:||© 2001 Electrochemical Society. Received February 26, 2001; published July 30, 2001. This work was financially supported by a fund of NSFC (no. 19804005) (L.L.). The Japanese Ministry of Education, Sceince, Sports, and Culture assisted in meeting the publication costs of this article.|
|Subject Keywords:||europium compounds; crystal structure; annealing; luminescence; Mossbauer effect; isomer shift; charge transfer states, phosphors, ionic conductivity, hopping conduction, high-pressure solid-state phase transformations|
|Classification Code:||PACS: 61.66.Fn; 81.05.Je; 78.55.Hx; 66.30.Hs; 61.50.Ks; 64.70.Kb; 81.30.Hd; 81.40.Gh; 78.60.-b; 76.80.+y|
|Official Citation:||Structure, Luminescence, and Transport Properties of EuVO[sub 4] Li-Ping Li, Guang-She Li, Yan-Feng Xue, and Hiroshi Inomata, J. Electrochem. Soc. 148, J45 (2001), DOI:10.1149/1.1388633|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||16 Nov 2011 21:43|
|Last Modified:||16 Nov 2011 21:43|
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