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RESEARCH PRODUCT
The preparation and thermal evolution of polymeric gels with garnet stoichiometry in the CaOAl2O3SiO2 and CaOCr2O3SiO2 systems
M.i. BurgueteJ.b. CardaP. EscribanoG. MonrósJavier Alarcónsubject
Materials scienceChemical engineeringInfraredScanning electron microscopeUvarovitePhase (matter)Homogeneity (physics)Materials ChemistryCeramics and CompositesInfrared spectroscopyMineralogyMicrostructureStoichiometrydescription
Abstract The synthesis of gels with garnet stoichiometry in the CaOAl 2 O 3 SiO 2 and CaOCr 2 O 3 SiO 2 systems and their evolution in thermal processing have been studied. Dried gels with the stoichiometry 3CaO.Al 2 O 3 .3SiO 2 show a homogeneous aspect without detectable crystalline phase. The thermal evolution of these gels indicates no formation of grossularite at temperatures up to 1000°C after 12 h. In the uvarovite garnet samples, 3CaO.Cr 2 O 3 .3SiO 2 , a small amount of crystalline phase was detected in the dried gels. The homogeneity of the gels was checked by scanning electron microscropy. The infrared study of these polymeric gels confirmed the presence of SiOMe (MeCr 3+ , Ca 2+ ) bonds. This may facilitate the formation of uvarovite at low temperatures.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1990-01-01 | Journal of the European Ceramic Society |