Crystallisation of iron(III)-zirconia co-gels

Inwang, Inwang B.; Chyad, Fadil; McColm, Ian J.

doi:10.1039/jm9950501209

Cited by 18 publications

(15 citation statements)

References 7 publications

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“…Using the same preparation method, the incorporation of Fe 3+ ions within the crystal structure of t-ZrO 2 at 500 8C has been observed [9], suggesting that the pretreatment temperature is less critical than initially thought. Inwang et al [10] reported that the formation of the ZrO 2 phase is strongly dependent on the pH of the precipitated gel. Kriventsov et al [11] and Navio et al [12] have prepared Fe-Zr mixed oxide gels using the co-precipitation method.…”

Section: Introductionmentioning

confidence: 98%

Effect of iron oxide loading on the phase transformation and physicochemical properties of nanosized mesoporous ZrO2

Basahel

Ali

Narasimharao

et al. 2012

Materials Research Bulletin

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Section: Introductionmentioning

confidence: 98%

Effect of iron oxide loading on the phase transformation and physicochemical properties of nanosized mesoporous ZrO2

Basahel

Ali

Narasimharao

et al. 2012

Materials Research Bulletin

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“…Similar phenomena have been observed for the solubility of iron in Zr0 2 during crystallization of iron-zirconia co-gels at various temperatures. 16 '…”

Section: Resultsmentioning

confidence: 99%

Production of Hydrogen and Carbon Monoxide from Water and Carbon Dioxide through Metal Oxide Thermochemical Cycles

Coker

Ambrosini

Rodriguez

et al. 2010

Ceramic Transactions Series

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Two-step thermochemical cycles using ferrite-based materials to split water and carbon dioxide are promising routes for the production of H 2 and CO (syngas). To aid in the design of highly efficient materials for H2 and CO production, this work aims to identify the metal oxide phases present during thermochemical cycling and how they change as a function of temperature and gas composition. Hightemperature X-ray diffraction (HT-XRD) was used to monitor the structure of iron oxides supported on YSZ (10 wt.-% Fe 2 0 3 basis) and cobalt-substituted ferrites during thermochemical cycling. HT-XRD showed dynamic behavior as iron migrated into and out of YSZ at elevated temperatures, monitored by the lattice parameter of the YSZ. Iron oxides were seen to thermally reduce stepwise from Fe 2 03 to Fe 3 0 4 and finally FeO as the temperature increased from ambient to 1400 °C under He with a low background of O2. Between 800 and 1100 °C no iron species were detected, indicating that all iron was in solid solution with YSZ. Similar cycles were performed with a cobalt-substituted ferrite which exhibited similar phase evolution. Exposure of Fe x Coi_ x O to C0 2 or air resulted in re-oxidation to Fe3 X Co3-3x04. Thermogravimetric analysis corroborated the reduction/oxidation behavior of the materials during thermal reduction and subsequent re-oxidation by H2O or CO2. A complimentary study on diffusion of iron oxide into YSZ revealed a steep increase in diffusion rate once temperatures exceeded 1475 °C. Fusion and vaporization of iron species at these high temperatures occurs.

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“…High temperature cubic and tetragonal polymorphs of HfO 2 and ZrO 2 could appear in such metastable solid solutions. However, such stabilization is not very efficient [7,8,[21][22][23][24]. In our previous investigations, we examined the thermal behaviour of the amorphous precursors to the HfO 2 -FeO 1.5 and ZrO 2 -FeO 1.5 systems [7,8,24].…”

Section: Introductionmentioning

confidence: 99%

The influence of thermal treatment on the phase development in HfO2–Al2O3 and ZrO2–Al2O3 systems

Štefanić

Musić

Trojko

2005

Journal of Alloys and Compounds

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Crystallisation of iron(III)-zirconia co-gels

Cited by 18 publications

References 7 publications

Effect of iron oxide loading on the phase transformation and physicochemical properties of nanosized mesoporous ZrO2

Effect of iron oxide loading on the phase transformation and physicochemical properties of nanosized mesoporous ZrO2

Production of Hydrogen and Carbon Monoxide from Water and Carbon Dioxide through Metal Oxide Thermochemical Cycles

The influence of thermal treatment on the phase development in HfO2–Al2O3 and ZrO2–Al2O3 systems

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