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- W876612215 abstract "The phosphor of BaSi2O5: Pb(superscript 2+) has been widely used for manufacturing of black light lamps and treating many types of skin disease such as psoriasis, vitiligo, atopic dermatitis and so on. However, the detailed informations about the mechanism of flux BaF2 used for preparing BaSi2O5: Pb(superscript 2+) phosphor can not be found in literature. The aim of this research is to work out the mechanism of flux BaF2 in the process of preparing BaSi2O5: Pb(superscript 2+). BaSi2O5: Pb(superscript 2+) sample was prepared by solid state reaction method at high temperature. Mixing compounds of barium and silicon which upon heating will react to form barium disilicate with a activating proportion Pb(NO3)2 The firing temperature is approximately 1100℃. Crystal structure of BaSi2O5: Pb(superscript 2+) phosphor is β-BaSi2O5. Ba(superscript 2+) was substituted by Pb(superscript 2+) partly in BaSi2O5 lattice so the XRD pattern of BaSi2O5: Pb(superscript 2+) phosphor is identical with BaSi2O5 crystal. Effect of BaF2 concentration on ultraviolet intensity was studied. Mechanism that the addition of flux BaF2 promotes the solid reaction and enhances BaSi2O5: Pb(superscript 2+) ultraviolet emission intensity was investigated by X-ray diffraction ,heat-flux differential scanning calorimetry, and photoluminescence. Results indicate that BaSi2O5: Pb(superscript 2+) phosphor forms at 800℃ by adding BaF2. High temperature firing with a small amount of BaF2 results in a phosphor with high emission intensity, BaSi2O5: Pb(superscript 2+) emission intensity reach its maximum when the amounts of flux BaF2 is 8%. BaF2 and SiO2 combine to form SiF4 and BaSi2O5 then the formed SiF4 will react with BaCO3 to form BaSi2O5 again. The addition of flux BaF2 promote the solid state reaction, the temperature forming BaSi2O5: Pb(superscript 2+) phosphor was reduced to 800℃ and it is consistent with thermodynamics theory." @default.
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- W876612215 date "2006-10-01" @default.
- W876612215 modified "2023-09-23" @default.
- W876612215 title "助熔剂BaF2在制备BaSi2O5: Pb(上标 2+)过程中的机理" @default.
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