Phase-transformation kinetics in triphasic cordierite gel
Apstrakt
A triphasic cordierite-type gel was prepared from silica sol, boehmite sol, and an aqueous solution of Mg(NO3)(2). 6H(2)O. The silica sol was obtained from water glass by the ion exchange method, while boehmite sol was obtained by peptization of freshly prepared Al(OH)(3), Phase transformations occurring in the get were studied by differential scanning calorimetry, x-ray diffractometry, and Fourier transform infrared spectrometry. Spinel was observed to crystallize from the gel prior to cristobalite; their reaction subsequently yielded alpha -cordierite, At higher temperatures, alpha -cordierite transformed into modulated beta -cordierite. Kinetic parameters of alpha -cordierite formation and alpha -cordierite to modulated beta -cordierite transformation were determined by differential scanning calorimetry under nonisothermal conditions. Formation of alpha -cordierite was found to be a diffusion-controlled process. with an overall activation energy Of E-a = 1232 +/- 66 kJ/mol. During t...he alpha -- GT beta -cordierite transformation, a modulated phase was formed by surface transformation of alpha -cordierite, The overall activation energy for the formation of the modulated structure is E-a = 583 +/- 77 kJ/mol.
Izvor:
Journal of Materials Research, 2001, 16, 2, 451-458
DOI: 10.1557/JMR.2001.0068
ISSN: 0884-2914
WoS: 000166775900021
Scopus: 2-s2.0-0035262064
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Petrović, R AU - Janaćković, Đorđe T. AU - Zec, Slavica AU - Drmanic, S AU - Kostic-Gvozdenovic, L PY - 2001 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2411 AB - A triphasic cordierite-type gel was prepared from silica sol, boehmite sol, and an aqueous solution of Mg(NO3)(2). 6H(2)O. The silica sol was obtained from water glass by the ion exchange method, while boehmite sol was obtained by peptization of freshly prepared Al(OH)(3), Phase transformations occurring in the get were studied by differential scanning calorimetry, x-ray diffractometry, and Fourier transform infrared spectrometry. Spinel was observed to crystallize from the gel prior to cristobalite; their reaction subsequently yielded alpha -cordierite, At higher temperatures, alpha -cordierite transformed into modulated beta -cordierite. Kinetic parameters of alpha -cordierite formation and alpha -cordierite to modulated beta -cordierite transformation were determined by differential scanning calorimetry under nonisothermal conditions. Formation of alpha -cordierite was found to be a diffusion-controlled process. with an overall activation energy Of E-a = 1232 +/- 66 kJ/mol. During the alpha -- GT beta -cordierite transformation, a modulated phase was formed by surface transformation of alpha -cordierite, The overall activation energy for the formation of the modulated structure is E-a = 583 +/- 77 kJ/mol. T2 - Journal of Materials Research T1 - Phase-transformation kinetics in triphasic cordierite gel VL - 16 IS - 2 SP - 451 EP - 458 DO - 10.1557/JMR.2001.0068 ER -
@article{ author = "Petrović, R and Janaćković, Đorđe T. and Zec, Slavica and Drmanic, S and Kostic-Gvozdenovic, L", year = "2001", abstract = "A triphasic cordierite-type gel was prepared from silica sol, boehmite sol, and an aqueous solution of Mg(NO3)(2). 6H(2)O. The silica sol was obtained from water glass by the ion exchange method, while boehmite sol was obtained by peptization of freshly prepared Al(OH)(3), Phase transformations occurring in the get were studied by differential scanning calorimetry, x-ray diffractometry, and Fourier transform infrared spectrometry. Spinel was observed to crystallize from the gel prior to cristobalite; their reaction subsequently yielded alpha -cordierite, At higher temperatures, alpha -cordierite transformed into modulated beta -cordierite. Kinetic parameters of alpha -cordierite formation and alpha -cordierite to modulated beta -cordierite transformation were determined by differential scanning calorimetry under nonisothermal conditions. Formation of alpha -cordierite was found to be a diffusion-controlled process. with an overall activation energy Of E-a = 1232 +/- 66 kJ/mol. During the alpha -- GT beta -cordierite transformation, a modulated phase was formed by surface transformation of alpha -cordierite, The overall activation energy for the formation of the modulated structure is E-a = 583 +/- 77 kJ/mol.", journal = "Journal of Materials Research", title = "Phase-transformation kinetics in triphasic cordierite gel", volume = "16", number = "2", pages = "451-458", doi = "10.1557/JMR.2001.0068" }
Petrović, R., Janaćković, Đ. T., Zec, S., Drmanic, S.,& Kostic-Gvozdenovic, L.. (2001). Phase-transformation kinetics in triphasic cordierite gel. in Journal of Materials Research, 16(2), 451-458. https://doi.org/10.1557/JMR.2001.0068
Petrović R, Janaćković ĐT, Zec S, Drmanic S, Kostic-Gvozdenovic L. Phase-transformation kinetics in triphasic cordierite gel. in Journal of Materials Research. 2001;16(2):451-458. doi:10.1557/JMR.2001.0068 .
Petrović, R, Janaćković, Đorđe T., Zec, Slavica, Drmanic, S, Kostic-Gvozdenovic, L, "Phase-transformation kinetics in triphasic cordierite gel" in Journal of Materials Research, 16, no. 2 (2001):451-458, https://doi.org/10.1557/JMR.2001.0068 . .