Abstract: A high-temperature-resistant and high-stability ion sieve and a preparation method and application thereof are provided. Based on a molar percentage of each oxide in the ion sieve, a composition of the ion sieve includes: SiO2: 46-60 mol %, Al2O3: 3-16 mol %, Y2O3: 0-3 mol %, and R2O: 33-45 mol %, where R2O is an alkali metal oxide; and the ion sieve satisfies: SQ3/SQ2 is not lower than 1.

Abstract: The present application discloses a strengthened microcrystalline glass having a high scratch resistance comprising a compressive stress layer and a tensile stress layer. The glass has a main crystalline phase of (Zn, Mg)Al2O4 and comprises Na2O. It has a surface K2O concentration of ?7.00 wt %. Along the thickness direction of the glass, the glass has a depth of ?0.07 t, preferably 0.07 t to 0.10 t, which is from any surface of the glass to a location close to that surface and having the same potassium (K) concentration as that at the center of the glass, wherein t is the thickness of the glass. The strengthened microcrystalline glass has an excellent scratch resistance comparable to that of sapphire glass.