scholarly journals Effect of optical basicity on the stability of yttria-stabilized zirconia in contact with molten oxy-fluoride flux

2018 ◽  
Vol 101 (8) ◽  
pp. 3605-3616 ◽  
Author(s):  
Jicheng Guo ◽  
Thomas Villalon ◽  
Uday Pal ◽  
Soumendra Basu
Keyword(s):  
Optical Basicity ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Fluoride Flux ◽  
The Stability

Thermal Cycling Effect on Mechanical Properties of Yttria-Stabilized Tetragonal Zirconia

2013 ◽  
Vol 538 ◽  
pp. 121-124
Author(s):  
Jing Zhang
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Cycling ◽  
Tetragonal Zirconia ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Optical Applications ◽  
The Stability

Yttria-stabilized zirconia (YSZ) is an important material in the area of energy and optical applications. In this study, the mechanical properties (Young’s modulus, Vickers hardness, flexural strength, and coefficient thermal expansion) and physical properties (phase transition) of yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) was reported. The effect of thermal cycling on the mechanical properties and the stability was also evaluated.

Phase diagram for a nano-yttria-stabilized zirconia system

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17438-17445 ◽  
Author(s):  
Mohammad Asadikiya ◽  
Hooman Sabarou ◽  
Ming Chen ◽  
Yu Zhong
Keyword(s):  
Phase Diagram ◽  
Particle Size ◽  
Size Composition ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Stability Range ◽  
Particle Size Composition ◽  
Individual Phase ◽  
System P ◽  
The Stability

A 3-D phase diagram for an n-YSZ system was established in which the stability range of each individual phase can be predicted based on the particle size, composition, and temperature.

scholarly journals Влияние облучения ионами Si-=SUP=-+-=/SUP=- на резистивное переключение мемристивных структур на основе стабилизированного диоксида циркония

2019 ◽  
Vol 45 (14) ◽  
pp. 3
Author(s):  
Е.В. Окулич ◽  
М.Н. Коряжкина ◽  
Д.С. Королев ◽  
А.И. Белов ◽  
М.Е. Шенина ◽  
...  
Keyword(s):  
Resistive Switching ◽  
High Resistance ◽  
Ion Irradiation ◽  
High Resistance State ◽  
Yttria Stabilized Zirconia ◽  
Lateral Size ◽  
Stabilized Zirconia ◽  
Resistance State ◽  
The Stability ◽  
The Individual

Resistive switching of memristive structures based on films of yttria stabilized zirconia (40 nm), irradiated with Si+ ions with an energy of 6 keV and a dose of 5.4∙1015 cm-2, was studied. It is established that ion irradiation leads to an increase in the stability of the parameters of resistive switching. This improvement is due to the fact that the diameter of the filaments as a result of irradiation is limited to the lateral size of the region of the individual cascades of displacement. Oxidation of such filaments in the process of resistive switching occurs more efficiently, which leads to an increase in resistance in a high resistance state.

Fabrication and Performance of La0.6Sr0.4Co0.2Fe0.8O3−δ Infiltrated-Yttria-Stabilized Zirconia Cathode on Anode-Supported Solid Oxide Fuel Cell

2015 ◽  
Vol 12 (1) ◽  
Author(s):  
Dan Tang ◽  
Min-Fang Han ◽  
Zi-Wei Zheng
Keyword(s):  
Tape Casting ◽  
Casting Process ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Constant Voltage ◽  
Stabilized Zirconia ◽  
Three Phase ◽  
And Performance ◽  
The Stability ◽  
Operating Stage

The three layers with porous yttria-stabilized zirconia (YSZ) backbone/dense YSZ/porous NiO–YSZ were fabricated by tape-casting process, respectively, then laminated together and co-fired at 1300 °C for 5 h. The cathode material La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) was loaded by infiltrating the precursor of metal ions into porous YSZ backbone. As a result, LSCF nanoparticles with the size of 60–100 nm were uniformly distributed on YSZ backbone. The power density was 1.046 W cm−2 and the polarization resistance was 0.17 Ω cm2 at 800 °C in humidified H2 (3 vol.% H2O). But the stability was not good enough, especially in early operating stage, e.g., 20 h. After that, it showed good stability for the following 70 h operating under a constant voltage of 0.7 V at 750 °C. This is due to the growth and agglomeration of LSCF nanoparticles at early steps, which reduced the three phase boundaries (TPBs).

Microstructural examination of modified yttria stabilized zirconia by EM analytical techniques

1986 ◽  
Vol 44 ◽  
pp. 842-843
Author(s):  
W. W. Davison ◽  
R. C. Buchanan
Keyword(s):  
Mechanical Properties ◽  
Analytical Techniques ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Transmission Microscopy ◽  
Sintering Aid ◽  
Densification Temperature ◽  
Chemical Inertness ◽  
Scanning Transmission ◽  
Microstructural Examination

Yttria stabilized zirconia (YSZ) has become a significant technological material due to its high ionic conductivity, chemical inertness, and good mechanical properties. Temperatures on the order of 1700°C are required, however, to densify YSZ to the degree necessary for good electrical and mechanical properties. A technique for lowering the densification temperature is the addition of small amounts of material which facilitate the formation of a liquid phase at comparatively low temperatures. In this study, sintered microstructures obtained from the use of Al2O3 as a sintering aid were examined with scanning, transmission, and scanning transmission microscopy (SEM, TEM, and STEM).

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

2020 ◽  
Vol 38 (4A) ◽  
pp. 491-500
Author(s):  
Abeer F. Al-Attar ◽  
Saad B. H. Farid ◽  
Fadhil A. Hashim
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Structural Information ◽  
Impedance Analysis ◽  
High Energy ◽  
Yttria Stabilized Zirconia ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Powder Morphology ◽  
X Ray

In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

Spectroscopic investigation of the electronic structure of yttria-stabilized zirconia

2018 ◽  
Vol 2 (3) ◽  
Author(s):  
Thomas Götsch ◽  
Erminald Bertel ◽  
Alexander Menzel ◽  
Michael Stöger-Pollach ◽  
Simon Penner
Keyword(s):  
Electronic Structure ◽  
Spectroscopic Investigation ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia
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