THE CONSTITUTION OF GLASS

摘要: Glass is to be regarded as a liquid which has viscosity so great practically rigid; and the glasses of commerce are all solutions undercooled far below their normal crystallizing temperatures. Nothing more known regarding constitution these highly concentrated than about other solutions. The phase-equilibrium diagram gives no information compounds present in phase, for there correlation between properties homogeneous system those heterogeneous formed from it on crystallization. Evidence based rate volatilization alkali alkali-silicate does not indicate compound formation. discontinuous change glass “annealing range” been considered by some evidence that glassy state fourth matter separated this transition temperature; others, indicating above discontinuity material liquid, it, brittle solid. These views unsound, because they measurements physical made with changing temperature when themselves only but also require at each considerable time reach equilibrium value. When have held constant long enough value property attained, discontinuities observed justification calling or separating “brittle” “viscous” range. Arguments, variation composition such represented continuous curve series straight lines determined hypothetical compounds, shown theoretically improbable accord facts. Recent speculations X-ray recent studies means X-rays distinguished random nonrepeating atomic network. This conclusion harmony view an representing solution definite can identified.