Mechanosynthesis of the Orthorhombic Perovskites ErMn1−xNixO3 (x = 0, 0.1). Processing and Characterization of Nanostructured Ceramics
| Autor: | Jean Galy, Octavio Peña, Jesus Tartaj, Carlos Moure, A. Moure, Teresa Hungría, Alicia Castro |
|---|---|
| Přispěvatelé: | Instituto de Ceramica y Vidrio, Electroceramics Department, Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
General Chemical Engineering Spark plasma sintering Mineralogy [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Characterization (materials science) chemistry.chemical_compound chemistry Chemical engineering Tungsten carbide visual_art Thermal Materials Chemistry visual_art.visual_art_medium Orthorhombic crystal system Mechanosynthesis Ceramic 0210 nano-technology Perovskite (structure) |
| Zdroj: | Chemistry of Materials Chemistry of Materials, American Chemical Society, 2010, 22 (9), pp.2908-2915. ⟨10.1021/cm100236q⟩ Chemistry of Materials, 2010, 22 (9), pp.2908-2915. ⟨10.1021/cm100236q⟩ |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm100236q |
| Popis: | International audience; Because of the Jahn−Teller effect and low tolerance factor, the only reported method to obtain ErMnO3 materials with orthorhombic perovskite structure is to apply a high external pressure (on the order of GPa) at high temperature that transforms the stable room-temperature hexagonal structure to the more dense perovskite one. In this work, single-phase ErMnO3 and ErMn0.9Ni0.1O3 compositions with orthorhombic perovskite structure have been obtained for the first time by mechanosynthesis, after 24 h of milling in a tungsten carbide planetary mill. The high energy state achieved after the prolonged milling allows the perovskite structure to be isolated, instead of the habitual hexagonal one, without any external pressure. Subsequent thermal treatments transform the mechanosynthesized powder to the hexagonal structure at temperatures on the order of 1000 °C or higher. With the aim of obtaining ceramics with perovskite structure, spark plasma sintering (SPS) at 900 and 950 °C and 120 MPa was successfully tested. Ceramics processed by this way have densities greater than 90%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|