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The influence of phosphorus substitution by molybdenum on the chemical composition and certain properties of the zinc metaphosphate glass
Authors: Černošek Zdeněk | Holubová Jana | Hejda Petr
Year: 2019
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: "119556-1"-"119556-10"
Titles:
Language Name Abstract Keywords
cze Vliv záměny fosforu molybdenem na chemické složení a některé vlastnosti sklovitého metafosforečnanu zinečnatého Byl studován vliv záměny fosforu molybdenem na sklovitý metafosforečnan zinečnatý. Byla připravena skla (1-x/50)Zn(PO3)(2)-(x/50)ZnMoO4. složitáí analýza ukázala, že skla nejsou směsí výchozích oxidů, ale směsí chemických sloučenin vzniklých reakcemi v tavenině za teplot tavení. Fosfátová skla; molybden; struktura; chemický model; tepelné vlastnosti
eng The influence of phosphorus substitution by molybdenum on the chemical composition and certain properties of the zinc metaphosphate glass xMoO(3)-50ZnO-(50-x)P2O5, i.e. (1-x/50)Zn(PO3)(2)-(x/50)ZnMoO4, glasses were prepared up to x = 25. It has been proved that the glasses are not a mixture of boundary components, but that chemical reactions taking place in the melt during synthesis produce in equilibrium a more complicated chemical mixture. Molybdenum is incorporated into the glass structure as a molybdate(2-) and also as complex cations, a colorless molybdenyl MoO4+ (d(0) system) and blue colored MoO3+ (d(1)). The chemical model of the studied glasses was designed indicating that the glassy matrix gradually changes with increasing molybdenum content from pure anionic metaphosphate to the cationic-anionic network with the help of molybdenyl cation strongly bonded by four covalent donor-acceptor bonds with non-bonding phosphate oxygens. The compositional dependencies of some physical properties agree with the proposed chemical model. The melts or glasses of chemical compositions near the glass-forming border are less stable and immiscibility of glass phases was found. Phosphate glasses; Molybdenum; Structure; Chemical model; Thermal properties

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