Epitaxial Crystallization of Seeded Albite Glass

Abstract

Glasses that are extremely difficult to crystallize are generally avoided in making glass-ceramics. It is now possible to crystallize such glasses epitaxially using isostructural seeds. The role of solid-state epitaxy in the crystallization of such albite (NaAISi,O,) glass to glass-ceramic was investigated. The glass was seeded with extremely fine Zr02 (nonisostructural) and albite (isostructural) seed crystals. X-ray diffraction results indicated that the albite-seeded glass, heat-treated at 1000°C for 100 h, epitaxially crystallized to albite, while the ZrOz and unseeded glasses did not crystallize in identical heat-treatment conditions. In addition, the albite-seeded glass, heat-treated at 905°C for 10 d, crystallized mostly to albite, whereas the ZrOa and unseeded glasses at the same conditions contained only a small amount (4 wt%) of nepheline (NaAISiOs). The microstructure of the epitaxially grown glass-ceramics showed that extremely fine crystals (-0.2 pm thickness) were formed around the seed. [

Crystallization, texture and second-harmonic generation in TiO2–BaO–B2O3 glasses

“…Various methods have been applied to glass-ceramics to obtain defined crystallographic orientation, e.g., solid-state epitaxy [12][13][14], glass extrusion [15][16][17] or temperature gradients [18].…”

Surface Functionalized ZnO Particles Designed for the Use in Transparent Nanocomposites

“…Depending on the required properties and fields of application, a wide spectrum of nanocomposites are known. [1][2][3][4][5][6][7][8][9][10][11] Of especial interest, both academic and industrial, are nanocomposites consisting of a polymer and of inorganic particles. The incorporation of a small amount of inorganic nanoparticles sometimes dramatically changes the bulk properties of a polymer such as stiffness, impact toughness, [12] gas (vapor) permeability, [13] adsorption spectrum, or refractive index (RI).…”

Crystallization of Electrostatically Seeded Lanthanum Hexaluminate Films on Polycrystalline Oxide Fibers

“…16 -20 With isostructural seeds, submicrometer seed sizes were sufficient for satisfactory results. 17,18 The present studies of the unseeded sol, seeded sols, and preseeded sol-coated fibers have shown that proper seeding reduces the crystallization temperature of LaAl 11 O 18 by ϳ50°C (see Fig. 4) on continuous heating.…”

“…In the literature, many successful results by seeding in various systems have been reported. [15][16][17][18][19][20] In terms of fiber coating, it is difficult to obtain a homogeneous distribution of seeds in the coating sol. One approach to overcome this difficulty is to use electrostatic forces to deposit the seeds on the fiber surface before fiber coating.…”