Dehydration and crystallization process in sol-gel zirconia |
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Authors: | Picquart M. López T. Gómez R. Torres E. Moreno A. Garcia J. |
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Affiliation: | (1) Departamento de Física, Universidad Autónoma Metropolitana, Apto Postal 55 534, 09340 México DF, México;(2) Instituto Mexicano del Petróleo Eje Central, Lazaro Cardenas No. 152, C.P. 07730, México DF, México |
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Abstract: | Sol-gel zirconia was characterized using high-resolution thermogravimetry (Hi-Res TG) and differential scanning calorimetry (DSC) and compared with X-ray diffraction, Raman scattering, and UV-Vis spectroscopy. ZrO2-x(OH)2x·yH2O annealed below 400°C show typical behavior of amorphous material. As the annealing temperature is increased, the tetragonal and monoclinic phases crystallize. Typical Hi-Res TG curve shows that the samples are continuously dehydrated in a long temperature range, between room temperature and 600°C. The total mass loss relative to the initial mass is of about 29%. The DSC analysis coupled with TG and structural information, indicate that the exothermic processes about 355 and 447°C can be related to the nucleation process of the formation of tetragonal zirconia, with bulk crystallization at 447°C. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | sol-gel zirconia Raman study sol-gel zirconia TG-DTA sol-gel zirconia UV-Vis sol-gel zirconia XRD |
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