Effects of Zn/P ratio on structures and properties of zinc-iron phosphate glasses

Abstract

Effects of Zn/P ratio on the structures and properties of glasses with the general composition of (80-x)ZnO-20Fe₂O₃-xP₂O₅ (x=40, 45, 50, 55, 60) (molar fraction, %) were investigated. Glass structure was measured by infrared absorption spectrum. Glass density (ρ) was measured by the Archimedes method. Coefficients of thermal expansion (α) and characterization temperature were obtained by a dilatometer. Water durability of each glass was estimated from the dissolution rate(D_R)in water at 90 °C for 24 h. With increasing Zn/P ratio, water durability of zinc-iron phosphate glasses increases dramatically without large increase in the characterization temperature. (80-x)ZnO-20Fe₂O₃-xP₂O₅ glasses with 0.3≤Zn/P≤0.5 are suit for low-to-mid temperature sealing application for substrates with α<8.0×10⁻⁶ °C⁻¹.

Keywords

zinc-iron phosphate glass / sealing / structure / water durability / characterization temperature

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