Submicrometer spherical particles of mullite powder were synthesized by ultrasonic spray pyrolysis of emulsion and solutions, using tetra-ethyl-orthosilicate (TEOS) or silicic-acid and Al(NO3)(3) . 9H(2)O as initial compounds. Crystallization of mullite phase was determined by differential thermal (DT), thermogravimetric (TG), infrared (IR), and x-ray analyses. The synthesis of mullite from TEOS emulsion occurs by crystallization of gamma-Al2O3 (or Al, Si-spinel) from the amorphous phase and its subsequent reaction with amorphous SiO2, as well as by crystallization of pseudotetragonal mullite below 1000 degrees C and its subsequent phase transformation into orthorhombic mullite, in the powders produced from silicic acid solutions, synthesis of mullite occurs only by crystallization of gamma-Al2O3 between 900 and 1000 degrees C and its further reaction with amorphous SiO2 between 1100 and 1200 degrees C. Particle formation mechanism depended directly on the initial emulsion or solution ...preparation. i.e., on the phase separation in the emulsion and on the silicic-acid crosslinking conditions.
Извор:
Journal of Materials Research, 1996, 11, 7, 1706-1716
TY - JOUR
AU - Janaćković, Đorđe
AU - Jokanović, Vukoman
AU - Kostić-Gvozdenović, Ljiljana
AU - Zivković, L
AU - Uskoković, Dragan
PY - 1996
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/86
AB - Submicrometer spherical particles of mullite powder were synthesized by ultrasonic spray pyrolysis of emulsion and solutions, using tetra-ethyl-orthosilicate (TEOS) or silicic-acid and Al(NO3)(3) . 9H(2)O as initial compounds. Crystallization of mullite phase was determined by differential thermal (DT), thermogravimetric (TG), infrared (IR), and x-ray analyses. The synthesis of mullite from TEOS emulsion occurs by crystallization of gamma-Al2O3 (or Al, Si-spinel) from the amorphous phase and its subsequent reaction with amorphous SiO2, as well as by crystallization of pseudotetragonal mullite below 1000 degrees C and its subsequent phase transformation into orthorhombic mullite, in the powders produced from silicic acid solutions, synthesis of mullite occurs only by crystallization of gamma-Al2O3 between 900 and 1000 degrees C and its further reaction with amorphous SiO2 between 1100 and 1200 degrees C. Particle formation mechanism depended directly on the initial emulsion or solution preparation. i.e., on the phase separation in the emulsion and on the silicic-acid crosslinking conditions.
PB - Cambridge Univ Press, New York
T2 - Journal of Materials Research
T1 - Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis
EP - 1716
IS - 7
SP - 1706
VL - 11
DO - 10.1557/JMR.1996.0214
ER -
@article{
author = "Janaćković, Đorđe and Jokanović, Vukoman and Kostić-Gvozdenović, Ljiljana and Zivković, L and Uskoković, Dragan",
year = "1996",
abstract = "Submicrometer spherical particles of mullite powder were synthesized by ultrasonic spray pyrolysis of emulsion and solutions, using tetra-ethyl-orthosilicate (TEOS) or silicic-acid and Al(NO3)(3) . 9H(2)O as initial compounds. Crystallization of mullite phase was determined by differential thermal (DT), thermogravimetric (TG), infrared (IR), and x-ray analyses. The synthesis of mullite from TEOS emulsion occurs by crystallization of gamma-Al2O3 (or Al, Si-spinel) from the amorphous phase and its subsequent reaction with amorphous SiO2, as well as by crystallization of pseudotetragonal mullite below 1000 degrees C and its subsequent phase transformation into orthorhombic mullite, in the powders produced from silicic acid solutions, synthesis of mullite occurs only by crystallization of gamma-Al2O3 between 900 and 1000 degrees C and its further reaction with amorphous SiO2 between 1100 and 1200 degrees C. Particle formation mechanism depended directly on the initial emulsion or solution preparation. i.e., on the phase separation in the emulsion and on the silicic-acid crosslinking conditions.",
publisher = "Cambridge Univ Press, New York",
journal = "Journal of Materials Research",
title = "Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis",
pages = "1716-1706",
number = "7",
volume = "11",
doi = "10.1557/JMR.1996.0214"
}
Janaćković, Đ., Jokanović, V., Kostić-Gvozdenović, L., Zivković, L.,& Uskoković, D.. (1996). Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis. in Journal of Materials Research
Cambridge Univ Press, New York., 11(7), 1706-1716.
https://doi.org/10.1557/JMR.1996.0214
Janaćković Đ, Jokanović V, Kostić-Gvozdenović L, Zivković L, Uskoković D. Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis. in Journal of Materials Research. 1996;11(7):1706-1716.
doi:10.1557/JMR.1996.0214 .
Janaćković, Đorđe, Jokanović, Vukoman, Kostić-Gvozdenović, Ljiljana, Zivković, L, Uskoković, Dragan, "Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis" in Journal of Materials Research, 11, no. 7 (1996):1706-1716,
https://doi.org/10.1557/JMR.1996.0214 . .
