Crystallization and infrared radiation properties of iron ion doped cordierite glass-ceramics

Heterogeneous ion solution is an important method to improve the wanted property of polycrystalline materials. In this paper, for the purpose of infrared radiation property modification, different contents Fe2O3 were doped in MgO–Al2O3–SiO2 system glasses. The effects of Fe2O3 doping on nucleation mechanism, crystallization behaviors and especially infrared radiation properties of this cordierite-crystalline based glass-ceramics were systematically investigated by means of differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show that, the doping of iron ion can promote the phase separation of this magnesium aluminosilicate glass, and therefore change the crystallization mechanism of this glass from surface crystallization to bulk crystallization. The iron ion incorporates into the crystal structure of cordierite by mean of substituting Mg2+ in M site. The substitution of Fe3+ to Mg2+ can form the vacant site of Mg2+ cations. For the effects of lattice distortion, impurity and vacancy defects which caused by the incorporation of iron ion, the infrared radiation performance of cordierite based glass-ceramics can be improved effectively.

Research highlights▶ The doping of iron ion can promote phase separation of the magnesium aluminotitanate glass. ▶ The crystallization mechanism of doped glasses changed from surface crystallization to bulk crystallization. ▶ The iron ion incorporated into the crystal structure of cordierite by mean of substituting Mg2+. ▶ The substitution of Fe3+ to Mg2+ can form the vacant site of Mg2+ cations. ▶ The infrared radiation performance can be improved effectively by iron ion doping.