Research of optical absorption and luminescence spectra of double-perovskite calcium tungstate co-doped with Yb3+/Ho3+
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The synthetic methods with tailored morphology of micro-nanosized tungstate materials and with rare earths dopped were summarized, as well as the effect factors of morphology control. The properties corresponding to various morphologies controlled of the micro-nanosized tungstate materials, especially the double tungstate family were researched. And the wide prospect of this kind of material was explored. As a new creative series of tungstate materials, the double tungstate was outlooked with respect to synthesizing novelty morphologies and thus the resultant properties. The future works on the tungstate materials were discussed.
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Morphology
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Colony morphology
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Persistent luminescence
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Summary The estimation of molybdenum and tungsten when present together has proved difficult, as is indicated by the large number of methods put forward for their determination. Many of the methods given are for one or other of these elements only, a note often being added that the presence of the other invalidates the method. The estimation of molybdate and tungstate in the mineral powellite has been briefly described by one of the authors (A. A. M.): molybdate and tungstate were precipitated as oxinates (Mo,W)O 2 (C 9 H 6 ON) 2 and the molybdate (MoO 4 ″) determined by measurement of the optical density at 230 mµ of a solution containing molybdate and tungstate. The amount of tungstate present was then estimated by difference. The property of the molybdate ion, MoO 4 ″, to absorb strongly in the ultra-violet has been further investigated and it has been found that, if a wave-length of 240 mµ is chosen and the proper precautions taken, the MoO 4 ″ ion can be estimated without significant interference by the WO 4 ″ ion. Methods are given for the analysis of the common molybdate and tungstate minerals, together with results obtained during the course of this investigation.
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Stokes shift
Persistent luminescence
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In this dissertation,we explore a facile and economical method to prepare tungstate nano-structure.Furthermore,the structure and the shape of samples tungstate were characterized.And the photocatalytic property of tungstate was also investigated.The different nanostructures of Zinc tungstate samples have been successfully synthesized by a facile and economical method with Zn(NO3)2·6H2O and Na2WO4·2H2O as starting materials in the presence of PVP and SDBS.The samples were characterized by multiple measurements of the X-ray diffraction(XRD),the transmission electron microscopy(TEM).In this paper,the photocatalytic property of the ZnWO4 nanostructure was investigated.The results showed that the as-synthesized ZnWO4 structures showed excellent photocatalytic activity under exposure to UV irradiation.Therefore,the preparation and properties studies of ZnWO4 structures suggested potential future applications in photocatalysis.
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Sodium tungstate
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Nanomaterials
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Abstract The Raman spectra of a series of WO 3 AI 2 O 3 catalysts containing 1‐30 wt‐% of WO 3 were investigated with respect to the effect of O 2 calcination and H 2 OD 2 O exposure. These studies showed that the frequencies of bands due to surface tungstate species can be shifted reversibly by as much as 6% of their values during alternate O 2 calcination and H 2 O exposure cycles. The exchange of 18 O for l6 O in the surface tungstate was also investigated with Raman spectroscopy and ion‐scattering spectrometry. The results were used to assign Raman bands to fundamental vibrations of the surface tungstate and to propose a mechanism of interaction between H 2 O and the surface tungstate that hitherto has not been addressed for WO 3 AI 2 O 3 .
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The article discusses the preparation, properties, and behavior of uranyl tungstate and zirconium tungstate in salt melts. Procedures for their preparation are presented. The radiographic and IR spectroscopic characteristics, the thermal stability, and solubility and stability in chloride-tungstate melts of different composition have been studied.
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Uranyl
Thermal Stability
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