Internal friction investigation of phase transformation in nearly stoichiometric LaMnO3+δ
| Autor: | Gilbert Fantozzi, Sophie Guillemet, Bernard Durand, C. Bernard, Rachid Zenati, Christophe Calmet |
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| Přispěvatelé: | Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE) |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
LaMnO3
Materials science Matériaux Analytical chemistry Mineralogy 02 engineering and technology Trigonal crystal system [CHIM.MATE]Chemical Sciences/Material chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Phase transformation 01 natural sciences Internal friction Soft chemistry 0104 chemical sciences [SPI.MAT]Engineering Sciences [physics]/Materials Shear modulus Materials Chemistry Ceramics and Composites Hydrothermal synthesis Orthorhombic crystal system 0210 nano-technology Néel temperature Stoichiometry |
| Zdroj: | Journal of the European Ceramic Society Journal of the European Ceramic Society, Elsevier, 2005, vol. 25 n°6., 935-941 available on : http://oatao.univ-toulouse.fr/569/1/50.pdf Journal of the European Ceramic Society, Elsevier, 2005, pp.935-941 |
| ISSN: | 0955-2219 |
| Popis: | International audience; Rhombohedral LaMnO3+d powders, prepared by two different soft chemistry routes (co-precipitation and hydrothermal synthesis), are sintered at 1400 ?C for 2 h in air. Measurements of internal friction Q-1(T) and shear modulus G(T), at low frequencies from -180 to 700 ?C under vacuum, evidence three structural transitions of nearly stoichiometric orthorhombic LaMnO3+d. The first one, at 250 or 290 ?C, depending on the processing followed, is associated to either a JahnTeller structural transition or a phase transformation from orthorhombic to pseudo-cubic. The second one at 610 or 630 ?C is related to a phase transformation from pseudo-cubic or orthorhombic to rhombohedral. Below the Neel temperature, around -170 ?C, a relaxation peak could be associated, for samples prepared according to both processing routes, to the motion of Weiss domains. |
| Databáze: | OpenAIRE |
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