Crystallization processes, compressibility, sinterability and mechanical properties of La-monazite-type ceramics

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• 作者：C. Babelot^a ; ^b ; A. Bukaemskiy^a ; ^{a.bukaemskiy@fz-juelich.de} ; S. Neumeier^a ; G. Modolo^a ; D. Bosbach^a
• 关键词：Monazite ; Rare-earth elements ; Thermal analysis ; Crystal structure ; Mechanical properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：37
• 期：4
• 页码：1681-1688
• 全文大小：2579 K
• 卷排序：37

文摘

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.