Contribution of Raman and Luminescence Spectroscopies to the Investigation of Phase Demixion in the System BixLn(1-x)VO4
About: This article is published in Advanced Materials Research.The article was published on 1994-09-01. It has received 3 citations till now. The article focuses on the topics: Raman spectroscopy & Raman scattering.
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TL;DR: The vanadate BiMgVO5 has been prepared and its structure has been determined by single crystal X-ray diffraction: space group P 2 1 / n, a = 7.542 (6 ) A, b = 11.615 (5 ) A, c = 5.305 (3 ) A), β = 107.0447, R 2 = 0.0255,
57 citations
TL;DR: 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.
Abstract: 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 Mossbauer 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.
18 citations
TL;DR: In this article, the synthesis conditions of EuVO4-BtVO4 were investigated and the structural type was identified as a scheelite model with a zircon-type structure.
Abstract: A previous investigation of EuVO4–BtVO4 binary system has indicated the existence of a solid-solution of Eu1–xBixVO4 up to x= 0.60, with a zircon-type structure. In this work we have reinvestigated the synthesis conditions, thus extending the upper limit to x= 0.74. X-Ray diffraction techniques associated with Raman and luminescence spectroscopies have led to the unambiguous identification of the structural type as a scheelite model.
17 citations