| abstract |
Ion exchangeable glass compositions that develop concentration profiles and stress profiles that have higher magnitudes of concentration and compressive stress profiles than those provided by the error function (erfc)-shaped compressive stress profile for similar surface concentrations of stress-inducing components such as K + or K 2 O and stresses. The advantaged stress profile is the result of a glass composition that is low in K 2 O (or potassium) in the base glass prior to ion exchange. A glass comprising lower amounts of K + or K 2 O has a stronger dependence of diffusivity on concentration, leading to a non-erfc-shaped concentration profile. Several glass compositions that contain low amounts of K + or K 2 O exhibit this beneficial effect, whereas other glasses containing higher amounts of K + or K 2 O do not exhibit this effect. |