Directionally crystallized sodium lead silicate glass‐ceramic

TLDR: In this paper, the iron-nucleated devitrification of a lead silicate glass was studied; it produces a glass-ceramic consisting of sodium metasilicate crystals in a lead-silicate glass matrix.

Abstract: The iron-nucleated devitrification of a sodium lead silicate glass was studied; it produces a glass-ceramic consisting of sodium metasilicate crystals in a lead silicate glass matrix. The nucleating agent is not incorporated in the crystal phase, Anisotropic devitrification of the glass in a thermal gradient produces an aligned microstructure with needles of sodium metasilicate oriented with the c axis parallel to the direction of crystallization.