High bismuth vanadates

Bismuth vanadate can be produced by chemical precipitation, as weU as by high temperature calciaation methods. In the wet process, the acidic solution of bismuth nitrate, Bi(N02)3, is mixed with the alkaline solution of sodium vanadate, Na VO. The gel formed is filtered off on a filter, pressed, washed, and converted to a crystalline form by calciaation at low temperatures of 200—500°C for 1 h (37,38). 

Bismuth vanadate can be produced by either a wet process or high-temperature calcination. By the first method, an acidic solution of bismuth nitrate, Bi(N03)3. is mixed with an alkaline solution of sodium vanadate, Na3V04. The resultant gel is filtered, washed, and converted to crystalline form by low-temperature calcination at 200-500°C. Multiple-phase pigments can be created by coprecipitation of bismuth vanadate with molybdenum, tungsten, or niobium compounds. 

In this paper. We report the hydrothermal synthesis, structural characterization and ionic conductivity of a novel hydrated copper bismuth vanadate, Cu2Bi4V20i3 3H20 and its high temperature phase. 

Bismuth vanadate pigments are high-quality yellow pigments. They lie in the higher price range for inorganic pigments because the raw materials are relatively expensive. 

The chemistry of bismuth vanadate pigments makes them sensitive to acids. Ho v-ever, tests in which acids were applied to baking finishes under practical conditions have shown that the acid resistance of these pigments is normally comparable to that of a highly stabilized lead chromate. The application of bismuth vanadate pigments in powder coatings and coil-coatings should be tested in customer material, because in such cases - more than in standard liquid paint systems - the suitability depends on the total formulation. 

Taninouchi Y (2010) High Oxide-Ion conductivity and phase transition of doped bismuth vanadate. Kyoto University Nernst W (1899) US Patent 685 730,1899 Zhen YD, Jiang SP (2006) J Electrochem Soc 153 A2245... 

We the found Bi -doped vanadate phosphors can be possible candidates [35-37]. They can be excited by NUV rather than visible light and they can emit yellow or red lights with high eflhciency. For the yeUow phosphor LuV04 Bi, the efficiency is approximately 68 %, whereas it is 56 % for the red phosphor SCVO4 Bi. In the following text, we discuss the nature of Bi luminescence first, which is followed by a short review on the luminescence in different types of hosts. The emphasis will be on bismuth-doped vanadates. At the end, the open questions will be identified. 

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