Naslov
Kinetic analysis of isothermal crystallization of low-carnegieite from precipitated amorphous aluminosilicate precursor

Autori
Kosanović, Cleo ; Subotić, Boris ; Kranjc, Edi

Izvornik
Microporous and Mesoporous Materials (1387-1811) 71 (2004), 1; 27-32

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Precipitated amorphous aluminosilicate; Low-carnegieite; Crystallization; Kinetics; Mechanism

Sažetak
Kinetics of the isothermal crystallization of orthorhombic modification of low-carnegieite from precipitated amorphous aluminosilicate precursor, at three different temperatures, were investigated by powder X-ray diffraction, IR spectroscopy and scanning-electron microscopy. Kinetic analyzes of the transformation/crystallization processes have shown that the crystallization of low-carnegieite occurs by homogeneous nucleation of low-carnegieite inside the matrix of amorphous aluminosilicate precursor and diffusion-controlled, one-dimensional growth of the nuclei. The consequence of the one-dimensional crystal growth is the formation of the needle-shaped crystals of low-carnegieite. The apparent activation energy of the transformation/crystallization process is determined.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA