Calcium Tungstate Physical and Chemical Properties
Physical and Chemical Properties:
Calcium tungstate is white powder with tetragonal structure. Its relative density is 6.062. Slightly soluble in water and ammonium chloride solution. Dissociation in hydrochloric.
Calcium tungstate is self-activation phosphors, very efficient light-emitting material in X-rays, electron beams and UV excitation. It gives out blue fluorescence at 253.7nm ultraviolet light, emission spectrum peak wavelength of 423nm, half the width of 120nm. It emits blue light, the anode voltage 3kV, the peak wavelength of 415nm, luminous efficiency of 851m/W cathode ray excitation.
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Calcium tungstate is a self activated phosphor. It is an effective luminescent material under the excitation of X ray, electron beam and ultraviolet.
Tungsten trioxide exists in the form of hydrate in nature, including mineral forms: wolfram (WO3? H2O), water tungsten oxide (WO3.2H2O) and water tungsten oxide.
Tungsten carbide powder (WC) is the main raw material for producing cemented carbide, chemical formula WC. Tungsten carbide powder is a black six square crystal with metallic luster and hardness similar to diamond. It is a good conductor of electricity and heat.
Tungsten is a parent stone element, mainly in the form of wolframite in pegmatite and hydrothermal deposits; there are about 15 known tungsten ores, of which there are mainly two wolframite and scheelite.