In tungstate scintillators [ [ calcium tungstate | ] ] and [ [ cadmium tungstate | ] ] the emission is due to radiative decay of self-trapped excitons.
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In tungstate scintillators [ [ calcium tungstate | ] ] and [ [ cadmium tungstate | ] ] the emission is due to radiative decay of self-trapped excitons.
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Perhaps one of the most studied materials to exhibit " negative thermal expansion " is "'Cubic Zirconium Tungstate "'( ZrW 2 O 8 ).
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Sodium tungstate can also be produced by treating tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved.
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Zirconium tungstate, the archetypal material showing negative thermal expansion, contains ZrO 6 octahedra and WO 4 tetrahedra, with one of the corners of each WO 4 tetrahedra having no linkage.
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Lead tungstate crystals have the optical transparency of glass combined with much higher density ( 8.28 g / cm 3 vs ~ 2.2 g / cm 3 for fused silica ).
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As tungstate is progressively treated with acid, it first yields the soluble, metastable " paratungstate A " anion,, which over time converts to the less soluble " paratungstate B " anion,.
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Terbium is used to dope calcium fluoride, calcium tungstate and strontium molybdate, materials that are used in solid-state devices, and as a crystal stabilizer of fuel cells which operate at elevated temperatures.
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The mineral has tetragonal crystal symmetry and the same structure as scheelite ( calcium tungstate, CaWO 4 ), but can be metamict ( amorphous ) due to radiation damage from its small content of thorium.
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The counting analysis shows that, like silica, zirconium tungstate has an exact balance of the numbers of constraints and degrees of freedom, and further analysis has shown the existence of RUMs in this material.
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