GLASS-TRANSITION TEMPERATURES OF ALKALI VANADATE GLASSES

Glass forming limits and glass transition temperatures of alkali vanad ate glasses are reported. The glass formation, which required rapid co oling, occurred in the range R = 0.43 - 1.50 where R is the Molar rati o of alkali oxide to vanadium pentoxide. This range corresponds closel y to a eutectic common in each of the phase diagrams. The stability, d efined as the difference between the crystallisation temperature and t he glass transition temperature, reaches a maximum near this common eu tectic point.