Determination of cubic-tetragonal phase boundary in Zr1−XYXO2−X/2 solid solutions by Raman spectroscopy

Yashima, Masatomo; Ohtake, Katsuya; Arashi, H.; Kakihana, Masato; Yoshimura, Masahiro

doi:10.1063/1.354989

Cited by 92 publications

(80 citation statements)

References 15 publications

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“…The t phase is a stable one and is formed through a diffusional phase decomposition; t' is obtained through a diffusionless transition and is metastable. The t" form is intermediate between t' and cubic [176][177][178][179]. The H2-TPR profiles reported in [180] show peaks in the temperature range from 400 °C to 600 °C for CZ, attributed to a reduction of surface oxygen and bulk oxygen in Ce0.5Zr0.5O2, respectively [42, 181,182], while the peaks around 360 °C are assigned to the reduction of surface oxygen in CZ and of the bulk NiO, having weak interaction with the support.…”

Section: Silica-supported Nickelmentioning

confidence: 99%

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Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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CO 2 methanation is a well-known reaction that is of interest as a capture and storage (CCS) process and as a renewable energy storage system based on a power-to-gas conversion process by substitute or synthetic natural gas (SNG) production. Integrating water electrolysis and CO 2 methanation is a highly effective way to store energy produced by renewables sources. The conversion of electricity into methane takes place via two steps: hydrogen is produced by electrolysis and converted to methane by CO 2 methanation. The effectiveness and efficiency of power-to-gas plants strongly depend on the CO 2 methanation process. For this reason, research on CO 2 methanation has intensified over the last 10 years. The rise of active, selective, and stable catalysts is the core of the CO 2 methanation process. Novel, heterogeneous catalysts have been tested and tuned such that the CO 2 methanation process increases their productivity. The present work aims to give a critical overview of CO 2 methanation catalyst production and research carried out in the last 50 years. The fundamentals of reaction mechanism, catalyst deactivation, and catalyst promoters, as well as a discussion of current and future developments in CO 2 methanation, are also included.

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Section: Silica-supported Nickelmentioning

confidence: 99%

Section: Silica-supported Nickelmentioning

confidence: 99%

Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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“…It is noteworthy that the occurrence of another metastable tetragonal phase, called t , has been revealed by the Raman spectroscopy and neutron scattering for YSZ [15,17]. The difference between t phase and C phase is only in the oxygen displacement from its position in the fluorite unit cell.…”

Section: Cubic Phasementioning

confidence: 99%

“…To distinguish between the high symmetry phases, the Raman spectroscopy and neutron diffraction can be useful [17]. As the overlap concerns the peak positions rather than intensities, this problem may be, in such cases, frequently solved by using the Rietveld method (an example are the results of Ortiz et al, for SiC polytypic mixture characterised by a strong overlap [18]).…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing on the Crystal Structure and Microstructure of Pr Doped ZrO₂-Y₂O₃Nanocrystals

et al. 2010

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Rare-earth doped nanocrystalline yttria-stabilized zirconia (YSZ, ZrO2-Y2O3) is, recently, a subject of studies because of its luminescent properties. The luminescence may be strongly influenced by the crystal structure and microstructure of the material. In this work, the X-ray diffraction study for Pr doped YSZ nanocrystals is presented. The phase composition dependence on the Y2O3 content and on heat treatment conditions is quantitatively determined using the Rietveld method and the similarities and differences between the present data for doped samples and earlier reported data for undoped material are discussed. A formation of high symmetry phases (cubic and tetragonal) is observed for high yttria content in agreement with general tendencies observed in literature for undoped samples.

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“…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. 1.…”

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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Determination of cubic-tetragonal phase boundary in Zr1−XYXO2−X/2 solid solutions by Raman spectroscopy

Cited by 92 publications

References 15 publications

Supported Catalysts for CO2 Methanation: A Review

Supported Catalysts for CO2 Methanation: A Review

Effect of Annealing on the Crystal Structure and Microstructure of Pr Doped ZrO₂-Y₂O₃Nanocrystals

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

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Determination of cubic-tetragonal phase boundary in Zr1−XYXO2−X/2 solid solutions by Raman spectroscopy

Cited by 92 publications

References 15 publications

Supported Catalysts for CO2 Methanation: A Review

Supported Catalysts for CO2 Methanation: A Review

Effect of Annealing on the Crystal Structure and Microstructure of Pr Doped ZrO2-Y2O3Nanocrystals

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

Contact Info

Product

Resources

About

Effect of Annealing on the Crystal Structure and Microstructure of Pr Doped ZrO₂-Y₂O₃Nanocrystals