Measurement of the activation energies of oxygen ion diffusion in yttria stabilized zirconia by flicker noise spectroscopy

2019 ◽  
Vol 114 (25) ◽  
pp. 253506 ◽  
Author(s):  
Arkady V. Yakimov ◽  
Dmitry O. Filatov ◽  
Oleg N. Gorshkov ◽  
Dmitry A. Antonov ◽  
Dmitry A. Liskin ◽  
...  
Keyword(s):  
Flicker Noise ◽  
Activation Energies ◽  
Yttria Stabilized Zirconia ◽  
Ion Diffusion ◽  
Stabilized Zirconia ◽  
Oxygen Ion ◽  
Noise Spectroscopy ◽  
Oxygen Ion Diffusion

Molecular dynamics simulation of enhanced oxygen ion diffusion in strained yttria-stabilized zirconia

1998 ◽  
Vol 73 (11) ◽  
pp. 1502-1504 ◽  
Author(s):  
Ken Suzuki ◽  
Momoji Kubo ◽  
Yasunori Oumi ◽  
Ryuji Miura ◽  
Hiromitsu Takaba ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Yttria Stabilized Zirconia ◽  
Dynamics Simulation ◽  
Ion Diffusion ◽  
Stabilized Zirconia ◽  
Oxygen Ion ◽  
Oxygen Ion Diffusion

scholarly journals Dense lanthanum silicate oxyapatite ceramics obtained by uniaxial pressing and slip casting

2018 ◽  
Vol 50 (4) ◽  
pp. 433-443
Author(s):  
Ramiro Toja ◽  
Nicolás Rendtorffa ◽  
Esteban Agliettia ◽  
Tetsuo Uchikoshi ◽  
Yoshio Sakka ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vickers Hardness ◽  
Growth Process ◽  
Slip Casting ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion ◽  
Slip Cast ◽  
Lanthanum Silicate

Lanthanum silicate oxyapatite (LSO) is a promising ion conductive ceramic material, which has higher oxygen ion conductivity at intermediate temperatures (600-800?C) compared to yttria-stabilized zirconia. Its mechanical properties, though important for any of its applications, have been scarcely reported. In this study, we compare apparent densification, open porosity and Vickers hardness of samples conformed by uniaxial pressing and slip casting and fired up to 1600?C. Colloidal processing was optimized for slip casting in order to get high green densities. At sintering temperatures higher than 1400?C, both processing routes yielded comparable densities, although uniaxially pressed samples show slightly better mechanical properties, evidencing that slip cast ones already underwent a grain growth process.

scholarly journals Oxygen deficient layered double perovskite as an active cathode for CO2 electrolysis using a solid oxide conductor

2015 ◽  
Vol 182 ◽  
pp. 227-239 ◽  
Author(s):  
Tae Ho Shin ◽  
Jae-Ha Myung ◽  
Maarten Verbraeken ◽  
Guntae Kim ◽  
John T. S. Irvine
Keyword(s):  
Double Perovskite ◽  
Cathode Side ◽  
Layered Perovskite ◽  
Ion Diffusion ◽  
Oxide Electrode ◽  
Oxygen Ion ◽  
A Site ◽  
Oxygen Ion Diffusion ◽  
Co2 Electrolysis ◽  
A Current

A-site ordered PrBaMn2O5+δ was investigated as a potential cathode for CO2 electrolysis using a La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The A-site ordered layered double perovskite, PrBaMn2O5+δ, was found to enhance electrocatalytic activity for CO2 reduction on the cathode side since it supports mixed valent transition metal cations such as Mn, which could provide high electrical conductivity and maintain a large oxygen vacancy content, contributing to fast oxygen ion diffusion. It was found that during the oxidation of the reduced PrBaMn2O5+δ (O5 phase) to PrBaMn2O6−δ (O6 phase), a reversible oxygen switchover in the lattice takes place. In addition, here the successful CO2 electrolysis was measured in LSGM electrolyte with this novel oxide electrode. It was found that this PrBaMn2O5+δ, layered perovskite cathode exhibits a performance with a current density of 0.85 A cm−2 at 1.5 V and 850 °C and the electrochemical properties were also evaluated by impedance spectroscopy.

Werkstoffaufbau und diffusiver Stofftransport aufgezeigt an ausgewählten Beispielen / Material structure and diffusive mass transport as pointed out by means of selected examples

2000 ◽  
Vol 6 (4) ◽  
pp. 429-450
Author(s):  
R. Kriegel ◽  
A. Buchwald ◽  
Ch. Kaps
Keyword(s):  
Mass Transport ◽  
Diffusion Coefficients ◽  
Transport Mechanism ◽  
Diffusion Models ◽  
Second Law ◽  
Material Structure ◽  
Ion Diffusion ◽  
Oxygen Ion ◽  
Oxygen Ion Diffusion

Abstract The diffusive mass transport in materials is above all determined by the material structure. The experimental determination of diffusion coefficients is based on diffusion models, which results from special mathematical solutions of Fick's second law and its corresponding boundary conditions. The general usefulness of these diffusion models will be described using some examples, e. g. the diffusion of deteriorating salts in masonry materials, the oxygen ion diffusion in mixed conducting ceramics and the cation exchange in single crystals. The measurement of the diffusion coefficients results in a better comprehension of the transport mechanism as well as of the "morphology" of the transport medium, which allows to optimize the conditions of the mass transport and the material structure and composition, respectively.

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