A new tentative phase equilibrium diagram for the ZrO2-CeO2 system in air

Durán, P.; González, M.; Moure, C.; Jurado, J. R.; Pascual, C.

doi:10.1007/bf00580121

Cited by 138 publications

(59 citation statements)

References 12 publications

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“…The behavior of the samples with a higher CeO 2 content [i.e., samples with the compositions (mol %) 88ZrO 2 · 12CeO 2 and 85ZrO 2 · 15CeO 2 ] is illustrated in the phase diagram of the ZrO 2 -CeO 2 system [5]. The solid solutions of these compositions begin to crystallize at the same temperatures (~300°C) in the cubic structure.…”

Section: Resultsmentioning

confidence: 98%

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Investigation into the phase formation in the ZrO2-CeO2 system

2005

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Nanopowders of solid solutions with different compositions are prepared in the zirconia-enriched region of the ZrO 2 -CeO 2 system. The crystallization of these powders and the formation of the monoclinic, cubic, and tetragonal solid solutions of the composition (Zr 1 -x Ce x )O 2 are investigated. It is found that the unit cell parameters of the solid solutions increase as the cerium content increases. This confirms the fact that cerium ions [ r (Ce 4+ ) = 1.11 Å] substitute for zirconium ions [ r (Zr 4+ ) = 0.98 Å] in these solid solutions. The average size of crystallites of the solid solutions under investigation increases from 5 to 60 nm in the temperature range 500-1200 ° C.

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Section: Resultsmentioning

confidence: 98%

“…In recent years, different phase diagrams of the ZrO 2 -CeO 2 system have been published in the literature for solid solutions in the composition regions enriched with zirconia [4,5]. For our investigation, we chose solid solutions of the compositions containing 2, 5, 12, 15, and 33 mol % CeO 2 .…”

Section: Introductionmentioning

confidence: 99%

Investigation into the phase formation in the ZrO2-CeO2 system

2005

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“…S4). The pure CeO 2 NPs exhibited cubic phase and, since mixed states of tetragonal and monoclinic phases are quite usual in ZrO 2 [34][35][36], it is noteworthy that our ZrO 2 NPs exhibited only tetragonal phase. In the case of the (Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultra-simple synthetic approach to the fabrication of CeO2–ZrO2 mixed nanoparticles into homogeneous, domain, and core–shell structures in mesoporous spherical morphologies using supercritical alcohols

Pradeep

Habu

Tooriyama

et al. 2015

The Journal of Supercritical Fluids

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CeO 2 -ZrO 2 composite nanoparticles with mesoporous and spherical morphologies were assembled into different homogeneously dispersed, domain, and core-shell structures by changing the reaction conditions, such as the heating rate, acid, and solvent, in supercritical alcohols. Ce x Zr 1-x O 2 with homogeneous structures were prepared from Ce(NO 3 ) 3 and ZrO(NO 3 ) 2 in the presence of formic acid in methanol by rapid heating (500 °C/min) to 300 °C, while CeO 2 -ZrO 2 with domain structures were obtained by slow heating (5.4 °C/min). Treatment of mesoporous and spherical ZrO 2 nanoparticles with a Ce(NO 3 ) 3 solution in supercritical conditions yielded CeO 2 -ZrO 2 nanocomposites with core-shell morphologies, while solvents playing a key role in controlling the thickness of the outer shell; methanol produced a very thin outer shell structure of cubic CeO 2 and 2-propanol afforded a thick one.

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“…CeO 2 and ZrO 2 form solid solutions for a wide range of compositions and the phase diagram has been extensively studied since the 1950s [20][21][22][23][24][25]. A monoclinic (P2 1 /c), a cubic (Fm3m) and three tetragonal phases termed t, t 0 and t 00 (all space group P4 2 /nmc) are reported for temperatures below 1273 K [26][27][28].Their existence regions are indicated in the upper abscissa in Fig.…”

Section: Structurementioning

confidence: 99%

Thermodynamic Control of Product Formation During the Reaction Between CH4 and Pt Promoted Ceria-zirconia Solid Solutions

et al. 2010

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The reaction between CH 4 and framework oxygen of Pt promoted Ce x Zr 1-x O 2 (x = 0.25, 0.5, 0.75, 1) solid solutions was studied at 873 K for syngas (CO ? H 2 ) production. The homogeneity and cubic/tetragonal structure of the solid solutions were confirmed by powder X-ray diffraction. The thermodynamic properties of the solid solutions, connected with Ce 4? /Ce 3? redox reactions, were measured by titrating the oxygen content of the oxides after equilibration in flowing mixtures of H 2 and CO 2 with 10 -31 \ pO 2 \ 10 -22 atm. The transient reactions between the oxides and discrete pulses of CH 4 , as well as of isotopically labeled 13 CH 4 ? 12 CO mixtures (limited to the material with x = 0.25) were investigated and reactivity, conversion and selectivity were measured. A strong correlation between the thermodynamic properties of the oxides and the syngas selectivity was found. The 13 C scrambling in CO and CO 2 during co-feed experiments confirmed equilibration of these molecules with the oxides surfaces.

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A new tentative phase equilibrium diagram for the ZrO2-CeO2 system in air

Cited by 138 publications

References 12 publications

Investigation into the phase formation in the ZrO2-CeO2 system

Investigation into the phase formation in the ZrO2-CeO2 system

Ultra-simple synthetic approach to the fabrication of CeO2–ZrO2 mixed nanoparticles into homogeneous, domain, and core–shell structures in mesoporous spherical morphologies using supercritical alcohols

Thermodynamic Control of Product Formation During the Reaction Between CH4 and Pt Promoted Ceria-zirconia Solid Solutions

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