Étude Raman de l'effet de taille nanométrique des cristallites sur le diagramme de phase P-T de la zircone
| Autor: | Guy Lucazeau, P. Bouvier |
|---|---|
| Přispěvatelé: | Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI ), Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2001 |
| Předmět: |
010302 applied physics
Chemistry Stereochemistry Zirconium alloy Analytical chemistry General Physics and Astronomy [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology [CHIM.INOR]Chemical Sciences/Inorganic chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nanocrystalline material Tetragonal crystal system symbols.namesake Phase (matter) 0103 physical sciences [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] symbols Cubic zirconia 0210 nano-technology Raman spectroscopy ComputingMilieux_MISCELLANEOUS Monoclinic crystal system Phase diagram |
| Zdroj: | Journal de Physique IV Proceedings Journal de Physique IV Proceedings, EDP Sciences, 2001, 11 (PR10), pp.Pr10-79-Pr10-83. ⟨10.1051/jp4:20011010⟩ |
| ISSN: | 1155-4339 1764-7177 |
| Popis: | The phase transformations of 7, 13, 18nm nanocrystalline zirconia prepared by pyrosol technique and 10-15nm zirconia prepared by oxidation of zirconium alloys have been monitored by Raman spectrometry. It is shown that for these zirconia, the tetragonal form can be obtained either under its metastable state at ambient conditions or from the monoclinic form by application of pressure below 4 GPa and with temperature increment smaller than 300 K. The nanometric monoclinic-tetragonal equilibrium line is strongly down-shifted in temperature compared to literature data measured on usual polycrystalline zirconia. In addition, the monoclinic-orthorhombic equilibrium line is slightly shifted to higher pressure (i.e. 7 GPa). These results confirm that stresses can play a primordial role in the formation of tetragonal form in the oxidation process of zirconium alloys. |
| Databáze: | OpenAIRE |
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