ملخص: Glass formation has been investigated in ternary systems Sb2O3-PbO-M2O in which M is alkali Li, Na and K and antimony oxide is the glass former. Alkali elements were introduced as carbonates. The size of the glass forming region is enlarged as alkali ionic radius increases. Binary Sb2O3-M2O glasses were obtained: (100-x) Sb2O3-xLi2O, (10xx) Sb2O3-xNa2O, (10xx) Sb2O3-xK2O, (10xTg, onset of crystallization, Tx, and maximum of crystallization, Tp, have been measured using differential scanning calorimetry. Depending on composition, glass transition temperature ranges from 240 to 330 [deg]C. The incorporation of alkali oxide increases Tg while lead oxide has the reverse effect. Thermal stability range (Tx-Tg) was usually between 65 and 266 [deg]C, while no crystallization exotherm was observed in some cases. Density and thermal expansion increases as lead concentration increases. Optical transmission has been measured. The UV cut-off depends on alkali content: samples are yellow and turn green for large K and Na content. These glasses have potential applications as low phonon energy glasses for infrared transmission or active devices.

لغة: إنجليزية