Glass-based articles including a metal oxide concentration gradient

摘要: Embodiments of a glass-based article including first surface and second opposing the defining thickness (t) about 3 millimeters or less (e.g., 1 millimeter less), stress profile, wherein all points profile between range from 0·t up to 0.3·t greater than 0.7·t t, comprise tangent with slope having an absolute value 0.1 MPa/micrometer, are disclosed. In some embodiments, includes non-zero metal oxide concentration that varies along at least portion 0.3·t) maximum central tension in 80 MPa 100 MPa. alkali decreases point increases surface. The may be 0.05 mol % 0.5 throughout thickness. Methods for forming such articles also