Investigation of Cathodes with Scandia and Rare-earth Oxide Co-doped Matrices

2006 ◽  
Author(s):  
Jinshu Wang ◽  
Tao Gao ◽  
Wei Liu ◽  
Yiman Wang ◽  
Ji Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxide ◽  
Co Doped

scholarly journals Hydrothermal Synthesis of Nanocrystalline ZrO2-8Y2O3-xLn2O3 Powders (Ln = La, Gd, Nd, Sm): Crystalline Structure, Thermal and Dielectric Properties

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7432
Author(s):  
Radu-Robert Piticescu ◽  
Anca Elena Slobozeanu ◽  
Sorina Nicoleta Valsan ◽  
Cristina Florentina Ciobota ◽  
Andreea-Nicoleta Ghita ◽  
...  
Keyword(s):  
Rare Earth ◽  
Hydrothermal Synthesis ◽  
Ionic Conductivity ◽  
Thermal Treatment ◽  
Ionic Conduction ◽  
Rare Earth Oxide ◽  
Large Temperature ◽  
Size Segregation ◽  
Co Doping ◽  
Co Doped

Zirconium dioxide (ZrO2) is one of the ceramic materials with high potential in many areas of modern technologies. ZrO2 doped with 8 wt.% (~4.5 mol%) Y2O3 is a commercial powder used for obtaining stabilized zirconia materials (8 wt.% YSZ) with high temperature resistance and good ionic conductivity. During recent years it was reported the co-doping with multiple rare earth elements has a significant influence on the thermal, mechanical and ionic conductivity of zirconia, due complex grain size segregation and enhanced oxygen vacancies mobility. Different methods have been proposed to synthesize these materials. Here, we present the hydrothermal synthesis of 8 wt.% (~4.5 mol%) YSZ co-doped with 4, 6 and 8 wt.% La2O3, Nd2O3, Sm2O3 and Gd2O3 respectively. The crystalline phases formed during their thermal treatment in a large temperature range were analyzed by X-ray diffraction. The evolution of phase composition vs. thermal treatment temperatures shows as a major trend the formation at temperatures >1000 °C of a cubic solid solutions enriched in the rare earth oxide used for co-doping as major phase. The first results on the thermal conductivities and impedance measurements on sintered pellets obtained from powders co-doped with 8 wt.% Y and 6% Ln (Ln = La, Nd, Sm and Gd) and the corresponding activation energies are presented and discussed. The lowest thermal conductivity was obtained for La co-doped 8 wt.% YSZ while the lowest activation energy for ionic conduction for Gd co-doped 8 wt.% YSZ materials.

scholarly journals Effect of rare earth oxide CeO2 on the anodic bonding performance of PEG-based MEMS encapsulation materials

2021 ◽  
Vol 13 (3) ◽  
pp. 168781402110077
Author(s):  
Chao Du ◽  
Cuirong Liu ◽  
Xu Yin ◽  
Haocheng Zhao
Keyword(s):  
Tensile Strength ◽  
Rare Earth ◽  
Rare Earth Oxide ◽  
Solid Polymer Electrolytes ◽  
Anodic Bonding ◽  
Solid Polymer ◽  
Bonding Layer ◽  
Scanning Calorimetry ◽  
Ion Migration ◽  
Bonding Performance

Herein, we synthesized a new polyethylene glycol (PEG)-based solid polymer electrolyte containing a rare earth oxide, CeO2, using mechanical metallurgy to prepare an encapsulation bonding material for MEMS. The effects of CeO2 content (0–15 wt.%) on the anodic bonding properties of the composites were investigated. Samples were analyzed and characterized by alternating current impedance spectroscopy, X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, tensile strength tests, and anodic bonding experiments. CeO2 reduced the crystallinity of the material, promoted ion migration, increased the conductivity, increased the peak current of the bonding process, and increased the tensile strength. The maximum bonding efficiency and optimal bonding layer were obtained at 8 wt% CeO2. This study expands the applications of solid polymer electrolytes as encapsulation bonding materials.

scholarly journals On the resistance of rare earth oxide-doped YSZ to high temperature volcanic ash attack

2016 ◽  
Vol 307 ◽  
pp. 534-541 ◽  
Author(s):  
J. Xia ◽  
L. Yang ◽  
R.T. Wu ◽  
Y.C. Zhou ◽  
L. Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Volcanic Ash ◽  
Rare Earth Oxide

Wear resistance of hot-pressed Si3N4/SiC micro/nanocomposites sintered with rare-earth oxide additives

Wear ◽  
2010 ◽  
Vol 269 (11-12) ◽  
pp. 867-874 ◽  
Author(s):  
P. Tatarko ◽  
M. Kašiarová ◽  
J. Dusza ◽  
J. Morgiel ◽  
P. Šajgalík ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Rare Earth Oxide

Solution-Processed Rare-Earth Oxide Thin Films for Alternative Gate Dielectric Application

2016 ◽  
Vol 8 (45) ◽  
pp. 31128-31135 ◽  
Author(s):  
Jiaqing Zhuang ◽  
Qi-Jun Sun ◽  
Ye Zhou ◽  
Su-Ting Han ◽  
Li Zhou ◽  
...  
Keyword(s):  
Thin Films ◽  
Rare Earth ◽  
Gate Dielectric ◽  
Rare Earth Oxide ◽  
Oxide Thin Films ◽  
Solution Processed

Abrasive and Erosive Wear Performance of Rare Earth Oxide Doped Ni/WC Coatings

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Surajit Purkayastha ◽  
D. K. Dwivedi
Keyword(s):  
Rare Earth ◽  
Erosive Wear ◽  
Rare Earth Oxide ◽  
Wear Performance ◽  
Ceramic Phase ◽  
Enhanced Dissolution ◽  
Impact Angles ◽  
Rare Earth Doped ◽  
Microstructural Examination ◽  
Nickel Tungsten

The effect of CeO2 modification on flame sprayed nickel-tungsten carbide (WC) coatings was investigated. The modified coatings exhibited smaller grain sizes of the ceramic phase due to enhanced dissolution of the WC phase. The rare earth doped coatings, especially Ni-WC +0.9% wt. CeO2, showed superior abrasive wear resistance with respect to the unmodified coating mainly due to enhanced hardness. Coating modified with 0.6% wt. CeO2 demonstrated superior erosion resistance at both impact angles, 30 deg and 90 deg, respectively, primarily due to low porosity levels. Microstructural examination showed different wear mechanisms in conventional and doped coatings.

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