THE EFFECTS OF SODA,BARIUM, AND ZINC ON THE ELASTICITY AND THERMAL EXPANSION COEFFICIENTS OF GLASS1

An investigation is made of the effect, on the elasticity and expansion behavior of a base glass containing 60%, SiO₂ and 40% Na₂O, of replacing Na₂O in this glass by ZnO and BaO, respectively. The elasticity and expansion factors of the two oxides, ZnO and BaO, are determined and compared with published results. Elasticity factors of 80 for ZnO, 35 for Na₂O, and 55 for BaO are proposed. Cubical coefficient of expansion factors of 12.5 Na₂O, 5.7 for BaO, and 1.85 for ZnO are also proposed. Neither the factors of Winkelmann and Schott nor those of English and Turner fit very well the results reported in this paper.