Abstract
The crystallization behavior and microstructure of a series of Dy3+/Tb3+ doped aluminoborosilicate (ABS) magneto-optical glass was investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The apparent crystallization activation energy (Eg) and the kinetic properties at the corresponding glass transition temperature (Tg) were studied as a function of Dy3+/Tb3+ concentration. The results showed that the glass matrix precipitated Al3Tb(BO3)4 and TbBO3 crystals when subjected to heat treatment at 852.8 and 902.6°C, respectively. The crystallization activation energy of these two crystalline phases (Al3Tb(BO3)4 and TbBO3) was Ep1=993.3kJ/mol and Ep2=544.97kJ/mol, respectively. The average crystallization index was 0.5 and 0.8, respectively. By applying the Kissinger equation to the parameterized crystallization behavior, the calculated phase transition activation energy was determined to be 420.18kJ/mol. The parameterized crystallization behavior of this particular ABS magneto-optical glass can be used to avoid the deterioration of magneto-optical properties due to the crystallization of glass matrix.
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