Preparation of tetragonal ZrO2–12 mol% CeO2 and ZrO2–6 mol% YO1.5 solid solutions at reduced temperature by a simple aqueous solution route using citric acid as a complexant
1998; Elsevier BV; Volume: 280; Issue: 1-2 Linguagem: Inglês
10.1016/s0925-8388(98)00716-6
ISSN1873-4669
AutoresMasato Kakihana, Shingo Kato, Masatomo Yashima, Masahiro Yoshimura,
Tópico(s)Nuclear materials and radiation effects
ResumoA simple aqueous solution technique utilizing citric acid as a complexant was applied to prepare tetragonal ZrO2–12 mol% CeO2 and ZrO2–6 mol% YO1.5 solid solution powders at relatively low temperatures, viz. 600–1000°C. Heating of a mixed solution of citric acid (CA), water (H2O) and Ce (or Y) ions in the molar ratio of [CA]/[H2O]/[Zr+Ce (or Y)]=12.5(17.5 in the case of Y):300:1 on a hot-plate set at 160–200°C produced a transparent “gel” without any precipitation, which after heat treatment at 200°C was converted to a precursor for Zr0.88Ce0.12O2 (or Zr0.94Y0.06O1.97). The formation of compositionally homogeneous tetragonal zirconia phases occurred during the heat treatment of the precursor at 600–1000°C in static air, which was confirmed by a combined analysis using XRD and Raman scattering techniques.
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