Journal Article

PreJuSER-3685

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermal and Crystallization Behaviour of 8YSZ-CeO2 system

Bukaemskiy, A. A.FZJ* ; Barrier, D.FZJ* ; Modolo, G.FZJ*

2009
Elsevier Lausanne

This record in other databases:    

Please use a persistent id in citations: doi:10.1016/j.jallcom.2008.04.045

Abstract: The effect of the addition of ceria (0-100%) on the thermal behaviour and crystallization of yttria cubic-stabilised zirconia powders prepared by a "soft" co-precipitation method was investigated in detail using thermogravimetry coupled with differential scanning calorimetry (TG-DSC) and X-ray diffraction (XRD). It was shown that the synthesized powders after drying constitute a mixture of pure ceria and (ZrYCe)Ox solid solution with a reduced ceria content. The synthesized powders after drying with ceria contents up to 20 mol.% are amorphous. Their crystallization in the temperature range of 623-873 K is accompanied by two exothermal effects, which can be explained by the crystallization of (ZrYCe)Ox solid solution with a reduced ceria content and the incorporation of ceria into this matrix, respectively. The powders with a ceria content above 20 mol.% are already crystallized after drying, and a solid solution with equilibrium composition of (ZrYCe)Ox is formed during heating to 873 K. At temperatures above 873 K, all investigated powders form homogeneous (ZrYCe)Ox solid solutions with face-centred cubic, fluorite type structure, without any apparent segregation of ceria. The (ZrYCe)Ox lattice parameter was found to be a function of ceria content according to Vegard's law. (C) 2008 Elsevier B.V. All rights reserved.

Keyword(s): J ; Nuclear reactor materials (auto) ; Precipitation (auto) ; Crystal structure (auto) ; Thermal analysis (auto) ; X-ray diffraction (auto)

Note: This work was supported by the European Union (EUROPART, contract No F16W-CT-2003-508854). The authors would like to express their thanks to W. Reichert for performing the XRD measurements.

---

Contributing Institute(s):

1. Sicherheitsforschung und Reaktortechnik (IEF-6)

Research Program(s):

1. Nukleare Sicherheitsforschung (P14)

Appears in the scientific report 2009

---