Portal de Periódicos da CAPES

Effect of mechanical activation on structure and thermal decomposition of aluminum sulfate

2008; Elsevier BV; Volume: 472; Issue: 1-2 Linguagem: Inglês

10.1016/j.jallcom.2008.05.012

1873-4669

Morteza Ghasri-Khouzani, Mahmood Meratian, Masoud Panjepour,

Crystallization and Solubility Studies

The thermal decompositions of both non-activated and mechanically activated aluminum sulfates were studied by thermogravimetry (TG). The structural disorder, the specific surface area (SSA) and the morphology of mechanically activated aluminum sulfates were analyzed by X-ray diffraction (XRD), laser particle-size analyzer, and scanning electron microscopy (SEM), respectively. Thermal analyses results indicated that the initial temperature of thermal decomposition (Ti) in TG curves for mechanically activated aluminum sulfates decreased gradually with increasing the milling time. It was also found that the SSA of mechanically activated aluminum sulfates remained almost constant after a certain milling time, and lattice strains (ɛ) rose but the crystallite sizes (D) decreased with increasing the milling time. These results showed that the decrease of Ti in TG curves of mechanically activated aluminum sulfates was mainly caused by the increase of lattice distortions and decrease of the crystallite sizes with increasing the milling time.