Crystallization processes,compressibility, sinterability and mechanical properties of La-monazite-type ceramics |
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| Affiliation: | 1. Institut für Energie- und Klimaforschung, IEK-6, Forschungszentrum Jülich GmbH, Germany;2. Zentralinstitut für Engineering, Elektronik und Analytik, ZEA-1, Forschungszentrum Jülich GmbH, Germany;1. Robert Bosch GmbH, Automotive Electronics, Tübinger-Str. 123, 72762 Reutlingen, Germany;2. Robert Bosch GmbH, Corporate Sector Research and Advanced Engineering, 70465 Stuttgart, Germany;3. German Aerospace Center (DLR), Institute of Materials Research, Linder Höhe, 51147 Cologne, Germany;1. Department of Earth Sciences, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy;2. Soprintendenza Speciale per il Colosseo il Museo Nazionale Romano e l’Area Archeologica di Roma, P.zza dei Cinquecento 67, 00185 Rome, Italy;1. Ceramics Research Centre, Tata Steel, PO Box 10000, 1970CA IJmuiden, The Netherlands;2. Civil Engineering Department, KU Leuven, Kasteelpark Arenberg 40, bus 2448, 3001 Heverlee, Belgium;1. Kurnakov Institute of General and Inorganic Chemistry, 31, Leninsky prospect, Moscow, 119991, Russia;2. Vernadsky Institute of Geochemistry and Analytical Chemistry, 19, Kosygina str., Moscow, 119991, Russia |
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| Abstract: | Lanthanide orthophosphate ceramics with monazite structure gained broad interest for several industrial applications. The crystallization processes, compressibility and sinterability of monazite-type lanthanum orthophosphate powder hydrothermally synthesized at 200 °C as well as mechanical properties of the sintered compacts were investigated. Based on a combination of thermo- and surface area analyses, X-ray diffraction as well as scanning electron microscopy studies it was found that the crystallization process occurs at ～500 °C and the final crystallization of LaPO4 monoclinic phase takes place at 1400 °C. The sintered pellets are characterized by a density of 98% of theoretical density, a Vickers hardness of 5.7 ± 0.1 GPa and fracture toughness of 1.4 ± 0.1 MPa m0.5. |
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| Keywords: | Monazite Rare-earth elements Thermal analysis Crystal structure Mechanical properties |
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