GLASS FORMATION ABILITY: IS THE RAWSON'S 'LIQUIDUS TEMPERATURE EFFECT' ALWAYS EFFECTIVE?

摘要

With the purpose of application of Sun's and Rawson's ideas for evaluation of glass formation in multi-component (and not only oxide) systems, the Sun-Rawson criterion (glass formation ability of oxide is equal to the ratio of the chemical bond energy to the melting temperature in Kelvin), has been modified by replacing the chemical energy with the total covalent-ion binding of the alloy and the melting temperature with the liquidus temperature (the Sun-Rawson-Minaev criterion). It has been shown that the Rawson's "liquidus temperature effect" (increase of glass formation ability with decreasing of the liquidus temperature) in some ranges of phase diagrams of binary glass forming telluride systems As-Te, Ga-Te, Al-Te, which are characterized by "slow slope liquidus line" turned out to be ineffective due to stronger manifestation of the "covalent-ion binding effect" in such regions.