Estimation of liquidus temperatures in silicate glasses

Two models for estimating liquidus temperature from composition are present ed and compared with thermodynamically calculated temperature as well as pr imary phase. A simple polynomial model is given for high silica glasses, wh ile a model covering a wide composition range and several primary phase fie lds is more complex. Thermodynamic calculations generally give too high liq uidus temperatures in the devitrite field and too low in the primary field for Na2O . 2CaO . 3SiO(2). In the wollastonite field the values are scatter ed, but in general too high.