Magnesium aluminum titanate crystal structure and method for producing same

A process for producing an aluminum magnesium titanate crystal structure comprising aluminum magnesium titanate represented by the empirical formula MgxAl2(1−x)Ti(1+x)O5, where 0.1≦x<0.5 and 0.1 to 1 mol % of Al atoms are substituted with Si atoms, the process comprising

• firing, at a temperature of from 1,200 to 1,700° C., a raw material mixture comprising
• 1 to 10 parts by mass of a silicon-containing compound having a melting point of from 700 to 1,500° C. selected from the group consisting of plagioclase, feldspathoid, mica clay mineral, zeolite and cordierite, and
• 100 parts by mass of a mixture comprising a Mg-containing compound, an Al-containing compound and a Ti-containing compound in the same ratio as the metal component ratio of Mg, Al and Ti in the aluminum magnesium titanate represented by the empirical formula MgxAl2(1−x)Ti(1+x)O5, where 0.1≦x<0.5, as calculated as the respective oxides.

A solid solution of aluminum magnesium titanate crystal represented by the empirical formula MgxAl2(1−x)Ti(1+x)O5, where 0.1≦x<0.5 and 0.1 to 1 mol % of Al atoms are substituted with Si atoms.

A solid solution of aluminum magnesium titanate crystal represented by the empirical formula MgxAl2(1−x)Ti(1+x)O5, where 0.1≦x<0.5,

• wherein 0.1 to 1 mol % of Al atoms are substituted with Si atoms;
• and
• wherein said solid solution contains from >0 to 15 parts by mass of SiO2, ZrO2, Fe2O3, MgO, Al2O3, TiO2, CaO, Y2O3, and oxides having a spinel structure containing Mg per 100 parts by mass.