Comparative study of zinc addition effect on thermal properties of silicate and phosphate glasses

Abstract

The aim of the study was an analysis of two groups of glasses from the SiO 2 -P 2 O 5 -K 2 O-CaO-MgO system with various content of network formers in the form of P 2 O 5 and SiO 2 , modified by the addition of ZnO. Their effect on glass-forming ability, glass transition effect, crystallization process and the kind of crystallizing phases was examined using DSC and XRD methods. It was observed that in both matrixes, the addition of ZnO decreases the glass transition temperature (T g ). The lower T g values observed in the phosphate matrix glasses and the accompanying higher values of the changes in molar heat capacity (Dc p ) in contrast to the silicate matrix glasses may be considered an indicator of the degree of the reconstruction of their amorphous structure, which facilitates the process of their crystallization. It was found that the crystallizing products of the silicate matrix glasses were silicates and phosphates whose structure contained zinc. In the phosphate matrix glasses, it was observed that zinc inhibited the crystallization of silicate phases.

Structural insights into hybrid immiscible blends of metal–organic framework and sodium ultraphosphate glasses

“…The ZnO culminates in weaker P–O–Zn bonds throughout the glass network, replacing the stronger P–O–P bonds, giving a less compact glass network with decreased crosslink density and more ionic character. 63,64…”

“…The ZnO culminates in weaker P-O-Zn bonds throughout the glass network, replacing the stronger P-O-P bonds, giving a less compact glass network with decreased crosslink density and more ionic character. 63,64 31 P NMR Solid state magic angle spinning 31 P nuclear magnetic resonance (MAS NMR) spectroscopy was performed to investigate changes in the phosphate tetrahedra in the new blend materials, given the relatively high sensitivity of the spin 1 2 31 P nuclei.…”

Nuclear radiation shielding performance of the new lead‐free TeO2–Bi2O3–ZnO–BaF2 glass

“…The maximum ΔT value is 117.2 • C in TBZBF-3 glass, whereas the minimum ΔT value of TBZBF-9 glass is 88.7 • C. The phenomenon was attributed to the gradual substitution of ZnO with BaF 2 , resulting in a slight decline in the thermal stability. 34 Consequently, the TBZBF series glass demonstrated high thermal stability.…”

Characteristic of synthesis and transformations of hardystonite in willemite glass-crystalline glaze based on thermal analysis

“…The glassy matrix also can embed metal ions and give it different hue of color compared to color of the crystals [2,4]. Willemite is an orthosilicate containing zinc (Zn 2 SiO 4 ) and a main crystalline phase in decorative glassceramic glazes containing more than 20 % by mass ZnO [2,6,7]. Willemite glass-crystalline glaze belongs to multicomponent oxides system consisting of ZnO-SiO 2 -CaO-K 2 O-Na 2 O-Al 2 O 3 .…”