Effect of Rare Earth Elements on Stability and Sintering
high-temperature protective coatings it is still urgent to obtain rare earth-doped ZrO2 with high sintering resistance and good phase stability. Here the sintering resistance and phase stability of rare earth oxides (La2O3 Nd2O3 Gd2O3 and Y2O3)-stabilized zirconia (ZrO2) were thoroughly studied by theoretical and experimental methods.
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Chemical compatibility of rare earth apatite with yttria
Mar 01 2021 · The chemical compatibility of a series of rare earth apatite (RE-apatite) with Y 2 O 3-stabilized ZrO 2 (YSZ) has been investigated. Three types of RE-apatite powders with different ionic radius (RE = Gd Nd and La) were prepared and bulks prepared from the powder mixtures of RE-apatite and YSZ were heat-treated at 1300 °C up to 100 h in this study.
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Effect of Rare Earth Elements on Stability and Sintering
high-temperature protective coatings it is still urgent to obtain rare earth-doped ZrO2 with high sintering resistance and good phase stability. Here the sintering resistance and phase stability of rare earth oxides (La2O3 Nd2O3 Gd2O3 and Y2O3)-stabilized zirconia (ZrO2) were thoroughly studied by theoretical and experimental methods.
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High‐Temperature Stable Zirconia Particles Doped with
Jun 13 2016 · This stabilization is achieved by doping the material with aliovalent cations most commonly with yttrium. 9-12 Yttria‐stabilized zirconia (YSZ) has a high chemical and thermal stability and is widely used in fuel cells 13 and in high‐temperature applications such as TBCs. 14 TBCs are used to reduce the heat load on components in gas
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(PDF) Impact of yttria stabilization on Tb 3 intra-shell
The yttrium content is 6 mol. Figure 5 .5(a) PL spectrum and (b) PLE spectrum for as-grown ZrO 2 nanopowder stabilized by 10 mol Y 2 O 3 and doped with 0.5 of Tb. Figure 6 .6(a) PL spectra (area under curve calculation) under 260 nm excitation and (b) PLE spectra (area under curve calculation) for as-grown ZrO 2 nanopowder stabilized by Y 2
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Phase stability of thermal barrier oxides based on t
Zirconia stabilized with 7 /-1 wt. addition of yttria (7YSZ) is widely used for thermal barrier coatings (TBC s) on actively cooled gas turbine components selected partly because of its superior durability under thermal cyclic conditions. As deposited 7YSZ occurs as a metastable single-phase tetragonal solid solution (t ) that is thermodynamically stable against the deleterious
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Investigation on Mg and Sc Doped Ceria for Intermediate
) doped with rare earth metals as electrolyte materials showed higher ionic conductivity at relatively lower temperatures (≤800oC) to that of Yttria stabilized zirconia (YSZ) 8 . Ceria-based solid solutions have been regarded as being the most promising electrolytes
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2o3 Stabilized Zro2 zirconium Oxide-yttria Stabilized YSZ
ZrO2-Yttria ZrO2-8Y 70-80nm 86.5 . Application for y2o3 stabilized zro2 1.Yttria-stabilized zirconia (YSZ) is a ceramic in which the crystal structure of zirconium dioxide is made stable at room temperature by an addition of yttrium oxide. 2.YSZ doped with rare-earth materials can act as a thermographic phosphor and a luminescent material.
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Development and characterization of yttria stabilized
Springer Science Business Media 2007. 66 J. D. Corbett D. L. Pollard and J. E. Mee "Rare earth metal-metal halide systems. X. Phase studies of the yttrium and erbium chlorides and iodides. A correlation of the reduction characteristics of the rare earth elements " Inorganic Chemistry vol. 5 no. 5 pp. 1966.
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Yttrium Oxidean overview ScienceDirect Topics
Jan 04 2011 · Yttria is characterized by high thermal stability and is applicable in in materials technology dependent on this property. The element yttrium occurs geologically in many minerals along with the heavier lanthanide elements. This is a consequence of similar ionic sizes and chemical behavior.
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Rare-earth-doped Y3Al5O12 (YAG) nanophosphors synthesis
Jun 29 2018 · Yttrium aluminum garnets (YAG Y 3 Al 5 O 12) belong to an important class of versatile ceramic materials with impressive chemical stability high resistance and optical isotropy 1–4 .These oxides and their lanthanide (Ln)-doped derivatives display controlled and highly efficient light emission and thus several applications in the fields of optical materials imaging and laser technology
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Effect of Rare Earth Elements on Stability and Sintering
high-temperature protective coatings it is still urgent to obtain rare earth-doped ZrO2 with high sintering resistance and good phase stability. Here the sintering resistance and phase stability of rare earth oxides (La2O3 Nd2O3 Gd2O3 and Y2O3)-stabilized zirconia (ZrO2) were thoroughly studied by theoretical and experimental methods.
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High entropy defective fluorite structured rare-earth
Jun 05 2020 · Rare-earth tantalates and niobates (RE3TaO7 and RE3NbO7) have been considered as promising candidate thermal barrier coating (TBC) materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia (YSZ). However the low Vickers hardness and toughness are the main shortcomings of RE3TaO7 and
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Yttria-stabilized zirconiaWikipedia
Yttria-stabilized zirconia (YSZ) is a ceramic in which the cubic crystal structure of zirconium dioxide is made stable at room temperature by an addition of yttrium oxide.These oxides are commonly called "zirconia" (Zr O 2) and "yttria" (Y 2 O 3) hence the name.
Chat OnlineAdvantages of Yttria Stabilized Zirconia (YSZ) Compared to
Common zirconia stabilizers are rare earth or alkaline earth oxides and only oxides whose ionic radius differs from the Zr4 radius by no more than 40 can be used as stabilizers for zirconia. Among them yttrium oxide calcium oxide magnesium oxide and cerium oxide are more commonly used.
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Synthesis and Characterization of Cobalt Doped with Yttria
Effect of Cobalt doped 8YSZ on the ionic conductivity. SOFCs mostly operate at higher temperature. By substitute with dopants it can reduce the operating temperature and costs. In this experiment cobalt (1 2 and 3 mol ) mixed with 8YSZ and sintered at 1550 °C hold for two hours. Crystal structure microstructure sintering behaviour and ionic conductivity at 300 °C were investigated.
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Equimolar Yttria-Stabilized Zirconia and Samaria-Doped
ceramics Article Equimolar Yttria-Stabilized Zirconia and Samaria-Doped Ceria Solid Solutions Reginaldo Muccillo 1 2 Daniel Z. de Florio 2 and Eliana N. S. Muccillo 1 1 Energy and Nuclear Research Institute São Paulo Brazil enavarro usp.br 2 Center of Engineering Modeling and Applied Social Sciences Federal University of ABC Santo André Brazil daniel.florio
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Rare-earth-doped Y3Al5O12 (YAG) nanophosphors synthesis
Jun 29 2018 · Yttrium aluminum garnets (YAG Y 3 Al 5 O 12) belong to an important class of versatile ceramic materials with impressive chemical stability high resistance and optical isotropy 1–4 .These oxides and their lanthanide (Ln)-doped derivatives display controlled and highly efficient light emission and thus several applications in the fields of optical materials imaging and laser technology
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Audrey Siebert-TimmerManager Products and Engineering
Cubic Yttria-stabilized zirconia (c-YSZ) is a candidate material for high temperature applications due to its chemical inertness high thermal stability and low thermal conductivity. However c-YSZ has been found to degrade in aqueous environments.
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Advantages of Yttria Stabilized Zirconia (YSZ) Compared to
Common zirconia stabilizers are rare earth or alkaline earth oxides and only oxides whose ionic radius differs from the Zr4 radius by no more than 40 can be used as stabilizers for zirconia. Among them yttrium oxide calcium oxide magnesium oxide and cerium oxide are more commonly used.
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Defect Structure Ionic Conductivity and Diffusion in
ical model. Results of the theoretical analysis on yttria stabilized zirconia obtained herein are compared with those on calcia stabilized zirconia obtained in Paper 1 and are also discussed in relation to the ionic conductivity data of the various rare earth oxide-stabilized zirconia systems.
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Rare-earth-doped Y3Al5O12 (YAG) nanophosphors synthesis
Jun 29 2018 · Yttrium aluminum garnets (YAG Y 3 Al 5 O 12) belong to an important class of versatile ceramic materials with impressive chemical stability high resistance and optical isotropy 1–4 .These oxides and their lanthanide (Ln)-doped derivatives display controlled and highly efficient light emission and thus several applications in the fields of optical materials imaging and laser technology
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Rare earths Institute for Rare Earths and Strategic
Rare Earths / Rare Earth Elements / REE. Rare earths each member of the group of chemical elements consisting of three elements of the group 3 (scandium Sc yttrium Y and lanthanum La ) and the first extended series of elements below the main body of the periodic table (Cer Ce by Lutetium Lu ).
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(PDF) Impact of yttria stabilization on Tb 3 intra-shell
The yttrium content is 6 mol. Figure 5 .5(a) PL spectrum and (b) PLE spectrum for as-grown ZrO 2 nanopowder stabilized by 10 mol Y 2 O 3 and doped with 0.5 of Tb. Figure 6 .6(a) PL spectra (area under curve calculation) under 260 nm excitation and (b) PLE spectra (area under curve calculation) for as-grown ZrO 2 nanopowder stabilized by Y 2
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Yttrium Oxidean overview ScienceDirect Topics
Jan 04 2011 · Yttria is characterized by high thermal stability and is applicable in in materials technology dependent on this property. The element yttrium occurs geologically in many minerals along with the heavier lanthanide elements. This is a consequence of similar ionic sizes and chemical behavior.
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Defect Structure Ionic Conductivity and Diffusion in
ical model. Results of the theoretical analysis on yttria stabilized zirconia obtained herein are compared with those on calcia stabilized zirconia obtained in Paper 1 and are also discussed in relation to the ionic conductivity data of the various rare earth oxide-stabilized zirconia systems.
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Structure and reducibility of yttrium-doped cerium dioxide
Of particular importance for both technological applications and fundamental research are CeO 2 materials doped with rare-earth elements including yttrium. When CeO 2 is doped by an oxide of a trivalent metal such as Y 2 O 3 the initial structure contains O vacancies that are created in order to compensate the effective negative charge
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2o3 Stabilized Zro2 zirconium Oxide-yttria Stabilized YSZ
ZrO2-Yttria ZrO2-8Y 70-80nm 86.5 . Application for y2o3 stabilized zro2 1.Yttria-stabilized zirconia (YSZ) is a ceramic in which the crystal structure of zirconium dioxide is made stable at room temperature by an addition of yttrium oxide. 2.YSZ doped with rare-earth materials can act as a thermographic phosphor and a luminescent material.
Chat OnlinePhase diagrams and thermodynamics of rare-earth-doped
rare-earth-doped zirconia ceramics Chong Wang other than state-of-the-art YSZ (yttria-stabilized zirconia) aiming to lower thermal conductivity and/or microstructural stability upon high-temperature exposure 1 5–7 . Although there are numerous literature works on zirconia most of them are concentrated on the
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The Coordination Chemistry of Yttrium and the Rare Earth
The aqueous geochemistry of the rare-earth elements Critical stability constants for complexes with simple car☐ylic acids at 25°C and 1 bar and their application to nuclear waste management. Engineering Geology 1993 34 (3-4) .
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