Synthesis of Nanocrystalline Yttria Stabilized Zirconia for SOFC

Biswas, Mridula; Ojha, Prasant Kumar; Jayasingh, E. Moses; Prasad, C. Durga

doi:10.5772/50961

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…The simulation results in the empty cavity reported in Fig.2b use the TE10 excitation port condition at the frequency of 2.45 GHz in one of the rectangle face extremities and employ perfect reflecting conditions on the other faces. As expected, the two maximum electric field areas corresponding to the TE102 mode appear precisely at a quarter and three quarters of the cavity 5 length l. When a 3Y-ZrO2 cylindrical sample with dimensions of 12 mm in diameter, 12 mm in height and 55% of the relative density is considered at 300 K, as shown in Fig.2c, the field repartition changes. The maximum electric field is found to be located at y = 145.7 mm.…”

supporting

confidence: 76%

“…Zirconia ceramics presents useful properties in terms of super-plasticity, strength, hardness, ionic conductivity, and low thermal conductivity [1][2][3]. These properties lead to many industrial applications such as machinery, dentistry, oxygen sensors, oxygen pumps, solid oxide fuel cells (SOFCs), thermal barrier coating and refractory ceramics [4][5][6][7]. Many consolidation processes are reported in the literature for zirconia using various fabrication methods including conventional sintering, hot pressing, spark plasma sintering, and hot isostatic pressing [8][9].…”

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confidence: 99%

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Inherent heating instability of direct microwave sintering process: Sample analysis for porous 3Y-ZrO2

2017

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Direct microwave heating of 3Y-ZrO2 is studied at frequency of 2.45 GHz. Different conditions of input power, sample position and size are tested. For the first time, the experimentally known instability of microwave sintering is explained coupling the effective medium approximation and finite-element method. We show how the material dielectric permittivity imaginary part which increases with temperature and relative density encourages high hot spot phenomena. It is shown that the sample location has a great impact on the temperature distribution and decreasing the sample size promotes temperature homogenization thereby assisting the overall sintering stabilization.

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confidence: 76%

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confidence: 99%

Inherent heating instability of direct microwave sintering process: Sample analysis for porous 3Y-ZrO2

2017

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“…The electrolyte of an SOFC must be dense, have high ionic conductivity and zero electronic conductivity [1,2]. Yttria-stabilized zirconia (YSZ) can be used as an SOFC electrolyte, but the high operating temperature of ∼1000 • C necessary for oxygen ion conductivity would decrease the efficiency and stability of the cell [3,4]. Cerium oxide has a peculiar function different from other rare-earth oxides, as it tends to consist of non-stoichiometric compounds with +4 and +3 oxidation states of cerium.…”

Section: Introductionmentioning

confidence: 99%

Sintering temperature effect on density, structural and morphological properties of Mg- and Sr-doped ceria

Ahmad

Rao

Syed

2016

Journal of Taibah University for Science

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Strontium and magnesium doped ceria solid solutions (Ce 0.99 Sr 0.01 O 1.995 and Ce 0.99 M 0.01 O 1.995) were synthesized by a cost effective solid state reaction. The doped and un-doped CeO 2 samples were sintered at 1200 • C, 1300 • C and 1400 • C to investigate the effect of sintering temperature and doping on density, structural and morphological properties. The density was measured by Archimedes' method. It is observed that the density increases with increasing sintering temperature and with doping of strontium. The crystal structure and surface morphology have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD and SEM reveals that the synthesized samples are single phase with a cubic fluorite structure, and the grains formed are of different sizes. The grain size depends on sintering temperature and type of doping. The lattice parameter increases with sintering temperature and substitution of Sr in ceria. The Grain size of Sr-doped ceria decreases, whereas that of Mg-doped ceria increases. EDS spectra show that the samples are free of contaminants. The Ce 0.99 Sr 0.01 O 1.995 shows a more open structure than un-doped ceria.

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“…This endothermic process is related to the dehydration of the sample, as well as the partial decomposition of the organic part. Subsequently, exothermic processes occur at 177.5, 331.7, 502.6, 562.6, and 633.6 °C for ZgluGO and at 178.8, 341.4, 483.4, 544.9, and 662.4 °C for ZaspGO, which may be related to the pyrolysis of the material, as well as dehydroxylation and crystallization of zirconium during heating [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

Amino Acid Complexes of Zirconium in a Carbon Composite for the Efficient Removal of Fluoride Ions from Water

González-Aguiñaga

Pérez-Tavares

Patakfalvi

et al. 2022

IJERPH

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Amino acid complexes of zirconia represent an entirely new class of materials that were synthesized and studied for the first time for the decontamination of fluoride ion containing aqueous solutions. Glutamic and aspartic acid complexes of zirconia assembled with thin carbon (stacked graphene oxide) platelets deriving from graphite oxide (GO) were synthesized by a two-step method to prepare adsorbents. The characterization of the complexes was carried out using infrared spectroscopy to determine the functional groups and the types of interaction between the composites and fluoride ions. To reveal the mechanisms and extent of adsorption, two types of batch adsorption measurements were performed: (i) varying equilibrium fluoride ion concentrations to construct adsorption isotherms at pH = 7 in the absence of added electrolytes and (ii) using fixed initial fluoride ion concentrations (10 mg/L) with a variation of either the pH or the concentration of a series of salts that potentially interfere with adsorption. The experimental adsorption isotherms were fitted by three different theoretical isotherm equations, and they are described most appropriately by the two-site Langmuir model for both adsorbents. The adsorption capacities of Zr-glutamic acid-graphite oxide and Zr-aspartic acid-graphite oxide are 105.3 and 101.0 mg/g, respectively. We found that two distinct binding modes are combined in the Zr-amino acid complexes: at low solution concentrations, F− ions are preferentially adsorbed by coordinating to the surface Zr species up to a capacity of ca. 10 mg/g. At higher concentrations, however, large amounts of fluoride ions may undergo anion exchange processes and physisorption may occur on the positively charged ammonium moieties of the interfacially bound amino acid molecules. The high adsorption capacity and affinity of the studied dicarboxylate-type amino acids demonstrate that amino acid complexes of zirconia are highly variable materials for the safe and efficient capture of strong Lewis base-type ions such as fluoride.

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Synthesis of Nanocrystalline Yttria Stabilized Zirconia for SOFC

Cited by 11 publications

References 15 publications

Inherent heating instability of direct microwave sintering process: Sample analysis for porous 3Y-ZrO2

Inherent heating instability of direct microwave sintering process: Sample analysis for porous 3Y-ZrO2

Sintering temperature effect on density, structural and morphological properties of Mg- and Sr-doped ceria

Amino Acid Complexes of Zirconium in a Carbon Composite for the Efficient Removal of Fluoride Ions from Water

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