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Ceria delivered high-phase zirconia stabilization as no decomposition of phase was witnessed even after thermal aging. No formation of the m-phase was reported, and the c-phase was partially transformed into t-phase. An increase in crystallite size was observed with an increase in annealing time, but a decrease in microstrains was observed.
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Zirconium Oxide Stabilized By Scandium (III) And Cerium (IV) Complex Oxides As The Basis For Preparation Of Thick Films And Multilayers Structures For Low …
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The rare earth compounds yttrium oxide, yttrium aluminum garnet (YAG), and scandium oxide are among the other sophisticated TBC materials. Lanthanum zirconate, ceria-stabilized zirconia, and zirconium oxide are also available (Sc 2 O 3), lanthanum hex aluminate (LaAl 11 O 18), calcium zirconate (CaZrO 3), ceria-stabilized zirconia (CSZ), …
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Lanthanide-doped thoria is relevant both to nuclear energy and to solid oxide fuel cell technology. It is also a simple model system in which oxygen vacancy concentration is directly proportional to doping with no complication from oxidation–reduction reactions, ordered phases, or phase transitions in the tetravalent oxide.
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Tetragonal zirconia is thermodynamically stable above 1205 °C [30]; however, tetragonal phase has been observed in zirconia grown on zirconium at lower temperatures [25]. Two different stabilization mechanisms of tetragonal phase have led to distinct naming of tetragonal phases.
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4.2.1 Zirconia-based oxide ion conductors. Zirconia exhibits three polymorphs. It has a monoclinic structure at room temperature, changing to tetragonal above 1170 °C and to the cubic fluorite structure above 2370 °C. The addition of yttria can stabilise the fluorite and tetragonal phases down to room temperature.
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Similar to zirconia ceria also has fluorite structure as shown in Fig. 5 and is a common electrolyte for the SOFCs. It has good compatibility with electrodes. Doped ceria has high ionic conductivity particularly at lower temperature as compared to stabilized zirconia due to its large ionic radius of 0.97 Å (with 8 fold co-ordinations).
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Section snippets Synthesis of materials. Zirconia co-doped with 10 mol% Sc and 1 mol% Ce (scandia-ceria-stabilized-zirconia, 10Sc1CeSZ) electrolyte was synthesized by the microwave-assisted glycine nitrate process (MW-GNP).For the synthesis of 10Sc1CeSZ powder, the starting materials were scandium oxide (Sc 2 O 3, Aldrich), …
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the minimum composition of ceria required for a fully tetragonal microstructure clearly depends on the critical values of sintering temperature and the grain size [4]. To produce high strength zirconia minispheres, small grain size *1.0 lm is required [7, 8]. The present work aims at describing the preparation of ceria stabilized zirconia
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of the zirconia, in particular the structural degradation caused in thermal cycling. 2. Experimental This work focus on the analysis of mechanical properties, …
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This article presents the successful testing of 70% w/w samarium-doped ceria mixed with 30% w/w barium carbonate (SDC/BC) electrolyte for use as an improved electrolyte for low-temperature solid oxide fuel cells (LT-SOFCs). The phase changes, particle size distribution, morphology, electrochemical impedance, conductivity, and …
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Scandium-stabilized zirconia (Sc 0.2 Zr 0.8 O 2 ... An 8 -mol. % Y2O3-doped zirconia/10-mol. % GdO2-doped ceria (YSZ/GDC) bilayer electrolyte and a Gd0.5Sr0.5CoO3 (GSCO) cathode were deposited by a single-processing, pulsed laser deposition (PLD) method to fabricate anode support cells. No addnl. heat treatment was …
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This work aims to study a possible modification in the electronic structure of scandia-ceria-stabilized zirconia (10Sc1CeSZ) ceramics sintered at different temperatures. In addition to using X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance spectroscopy to investigate the structural and electrical properties, we …
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densification and stabilization of raw m-ZrO 2 has not been well studied yet. On the one hand, MMA is cheap precursor and compatible with zirconia ceramic composites. On the other hand, at high temperature it can provide Mg2+ and Al 3+ ions required for zirconia stabilization. Consequently, unwanted zirconia phase transformation will be prohibited
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Scandia Ceria Stabilized Zirconia is a complex ceramic material which contained Sc2O3, ZrO2 and CeO2. As a solid oxide fuel cells (SOFCs) cathode material, the material should help to develop, maintain cell …
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Ceria stabilized zirconia microsphere has been synthesized by external gelation. XRD investigations were carried out at each thermal treatment to study the …
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Structure sensitivity. We recently demonstrated that the Co–O–Ce interface between large cobalt particles and ceria–zirconia is favourable for CO 2 methanation 14.Here, we constructed metal ...
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Generally, oxide-ion conducting electrolytes such as YSZ, doped ceria, LSGM, scandium stabilize zirconia (ScSZ) are reported to be high sintering temperature materials above 1300 • C [6][7][8][9 ...
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Ricote et al. added Zr 4+ to the ceria support. Although the zirconia doping did not increase oxygen vacancies, it enhanced oxygen surface mobility and increased the reaction rate 14.
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Doping with another metal oxide (aside from scandium oxide) was proposed as a solution, and cerium oxide has been considered the most successful for the full stabilization of the cubic phase at room temperature [9, 10]. 10Sc1CeSZ conventionally sintered at 1150–1300 °C presents a mixture of cubic and rhombohedric phases, and …
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Scandium cerium-and gadoli nium-doped zirconia (Sc 0. 1 Ce 0. 05 Gd 0. 05 Zr 0. 89 O 2, SCGZ) was fabricated into an electrol yte - supported SOEC . Three grams of SCGZ powder ( Kceracell ...
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Scandia-stabilized-zirconia is a potential zirconia-based electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs). In this study, the properties of zirconia co-doped with 10 mol% Sc and 1 mol% Ce (scandia-ceria-stabilized-zirconia, 10Sc1CeSZ) electrolyte synthesized by the microwave-assisted glycine nitrate process …
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The nanostructured Scandia-Ceria stabilized Zirconia (SCSZ) was synthesized via a sol-gel route and the effects of different contents of Scandia stabilizer (3.6–8 mol. %) on phase stability and thermal shock resistance were investigated compared to traditional YSZ. The results revealed that after heat treating at 1400 °C for 25 h, the …
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X-ray Photoelectron Spectroscopy Analysis of Scandia-Ceria-Stabilized Zirconia Composites with Different Transport Properties. by. Iraida N. Demchenko. 1, …
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The grades of mol percent Y 2 O 3-doped zirconia (Y-PSZ) stabilization was investigated in the present paper to determine the effect of different mole percentages Y 2 O 3 in 10 Vol% Y-PSZ in α-Al 2 O 3 matrix for better ... and 5 wt%). The effect of the addition of manganese oxide on the sintering capacity of ceria-doped scandia-stabilized ...
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Scandia stabilized zirconia sample, containing 1mole % CeO 2, (1Ce9Sc sample) was prepared by using chemical polymeric precursor route called pichini method. …
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Mechanical properties of tetragonal scandium-stabilized zirconium oxide (ScSZ) co-doped with cerium oxide are studied before and after a complete reduction of Ce 4+ to Ce 3+.Samples of 6Sc1CeSZ (i.e., 6 mol% Sc 2 O 3, 1 mol% CeO 2), 6Sc2CeSZ, and 4Sc1CeSZ are produced by pressure-less sintering in air at 1450 °C. Test pieces are …
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Stabilization of cubic structure with dopants such as alkaline-earth or rare-earth oxide is therefore required. These dopants can also increase oxygen vacancies leading to an increase in oxygen ion conductivity. ... For example, Bi 2 O 3 is added in scandium, ceria and gadolinium-doped zirconia (SCGZ) to enhance the stability of the …
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Referring to theoretical and experimental works, for undoped ceria the migration enthalpy with the lower migration barrier of the oxygen preferentially occurs along the <100> axes 30, and along ...
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