E-catalog        

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The physic-chemical properties of ZnS:Cu, Cl, Br radioluminophor, with copper content of 0; 0,01; 0,1 and 0,6 mas, % were studied. This radioluminophor was synthesized in СПбГТИ (ТУ) by calcination of load in crucible under the layer of activated carbon. Load processing was subjected to electron beam modification. The resulting phosphors were subjected to low-temperature annealing at temperature of 650 °C. It was shown, that the studied samples are polydisperse powders. The sizes and shapes of crystals of phosphor powders change with a change in copper concentration. The size distribution and agglomeration degree of powders were determined by laser diffraction on Analyzette 22 NanoTec (Fritsch, Germany) laser analyzer. The distributions are characterized by the presence of one or two maxima. The distribution maxima lie in the region of diameters D ~ 10 fim, or D ~ 5 fim. In two maxima case, they lie in the region of diameters D ~ 7 fim, and D ~ 11.5 fim. The acid-base surface state of the phosphor samples, determined by pH-metry and the indicator method, is affected by both the content of activator and the samples dispersity. The formation of ZnO or CuO oxide compounds on the surface of phosphor particles during annealing, the precipitation of additional CuxS phase in defects and on the particles surface, and the different content of wurtzite and sphalerite phases are important factors that influence on acid-base state of phosphor surface.