Oxygen Ion Conductivity in a New Class of Layered Bismuth Oxide Compounds

1992 ◽  
Vol 293 ◽  
Author(s):  
Julie K. Thomas ◽  
Mairin E. Anderson ◽  
Wendy E. Krause ◽  
Hansconrad Zur Loye
Keyword(s):  
Oxygen Vacancy ◽  
Bismuth Oxide ◽  
Conductivity Data ◽  
Aurivillius Phase ◽  
Aurivillius Phases ◽  
Arrhenius Plots ◽  
Oxygen Ion Conductivity ◽  
New Class ◽  
Oxygen Ion ◽  
Ion Conductivities

AbstractCompounds that consist of intergrowths between the Aurivillius phase Bi4Ti3O12 and brownmillerite-like slabs of BaMO2.5were synthesized and their oxygen ion conductivities investigated. Both BaBi4Ti3ScO14.5 and BaBi4Ti3InO14.5 display a discontinuity in their Arrhenius plots that appears to be caused by an oxygen vacancy order-disorder transition. Conductivity data for two Aurivillius phases BaBi4Ti4O15 and BaBi2Nb2O9 are included for comparison.

Intrinsic Fast Oxygen Ionic Conductivity in the Gd2(ZrxTil−.)2O7, and Y2 (ZrxTil−x,)2O7, Pyrochlore Systems

1988 ◽  
Vol 135 ◽  
Author(s):  
P.K. Moon ◽  
H.L. Tuller
Keyword(s):  
Solid Solution ◽  
Ionic Conductivity ◽  
Oxygen Vacancy ◽  
Intrinsic Disorder ◽  
Structural Disorder ◽  
The Other ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion ◽  
O 24 ◽  
The Relationship

AbstractThe pyrochlore solid solution Gd2(Zrx Til−x)2O7, was found to be an attractive system for investigating the relationship between composition, structural disorder and ionic conductivity. Both cation and anion order parameters were found to decrease systematically with increasing substitution of Zr for Ti leading ultimately to intrinsic fast oxygen ion conductivity in the solid solution. The degree of intrinsic disorder was determined quantitatively from doping experiments and was found to be equal to l.0×lO39 exp(-O.24±0.03eV/kT)cm−6sfor x = 0.3 and substantially larger for higher values of x. Oxygen vacancy mobilities, on the other hand, were found to be relatively independent of x with values of μv, = 0.15exp(-0.78 ± 0.02 eV/kT)cm2V−1s−1. These, and more recent results, on Y2 (ZrxTil−x)2O7, are discussed in the context of the similarities between the pyrochlore and fluorite phases.

Oxygen ion conductivity in a new class of layered bismuth oxides

1994 ◽  
Vol 70-71 ◽  
pp. 221-224 ◽  
Author(s):  
K KENDALL ◽  
J THOMAS ◽  
H ZURLOYE
Keyword(s):  
Ion Conductivity ◽  
Bismuth Oxides ◽  
Oxygen Ion Conductivity ◽  
New Class ◽  
Oxygen Ion

Relationship between Phonon Parameters and Oxygen Ion Conductivity for Al-Yb Co-Doped Zirconia

2013 ◽  
Vol 582 ◽  
pp. 107-110 ◽  
Author(s):  
Takashi Teranishi ◽  
Nami Matsubara ◽  
Hidetaka Hayashi ◽  
Akira Kishimoto
Keyword(s):  
Lattice Vibration ◽  
Ion Conductivity ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion ◽  
Ion Conductivities ◽  
Damping Parameter ◽  
The Relationship ◽  
Co Doped

The relationship between the optical phonon parameters and the oxygen ion conductivities were investigated for AlYb co-doped zirconia ceramics. Intrinsic intragrain ion conductivity, σdc, decreased with increasing Al loading into ytterbia-stabilized zirconia, while the damping parameter of the lattice vibration, γ1TO, increased. This phenomenon agreed with findings of our previous study, which revealed a relationship between the σdc and the γ1TO for zirconia-based ion conductors.

Composition, crystallography, and oxygen vacancy ordering impacts on the oxygen ion conductivity of lanthanum strontium ferrite

2020 ◽  
Vol 22 (17) ◽  
pp. 9723-9733
Author(s):  
Tridip Das ◽  
Jason D. Nicholas ◽  
Yue Qi
Keyword(s):  
Crystal Structure ◽  
Oxygen Vacancy ◽  
Strontium Ferrite ◽  
Ion Conductivity ◽  
Oxygen Conductivity ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion ◽  
Lanthanum Strontium ◽  
Vacancy Ordering ◽  
The Impact

The oxygen conductivity map for LSF illustrates the impact of aliovalent doping, crystal structure, and oxygen vacancy interactions on conductivity.

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

2019 ◽  
Author(s):  
Kazuki Morita ◽  
Ji-Sang Park ◽  
Sunghyun Kim ◽  
Kenji Yasuoka ◽  
Aron Walsh
Keyword(s):  
Photocatalytic Activity ◽  
Crystal Engineering ◽  
First Principles ◽  
Parent Compound ◽  
Aurivillius Phase ◽  
Aurivillius Phases ◽  
Charge Neutrality ◽  
Bismuth Oxides ◽  
Structure Surface ◽  
Electric Dipoles

The Aurivillius phases of complex bismuth oxides have attracted considerable attention due to their lattice polarization (ferroelectricity) and photocatalytic activity. We report a first-principles exploration of Bi<sub>2</sub>WO<sub>6</sub> and the replacement of W<sup>6+</sup> by pentavalent (Nb<sup>5+</sup>, Ta<sup>5+</sup>) and tetravalent (Ti<sup>4+</sup>, Sn<sup>4+</sup>) ions, with charge neutrality maintained by the formation of a mixed-anion oxyhalide sublattice. We find that Bi<sub>2</sub>SnO<sub>4</sub>F<sub>2</sub> is thermodynamically unstable, in contrast to Bi<sub>2</sub>TaO<sub>5</sub>F, Bi<sub>2</sub>NbO<sub>5</sub>F and Bi<sub>2</sub>TiO<sub>4</sub>F<sub>2</sub>. The electric dipoles introduced by chemical substitutions in the parent compound are found to suppress the spontaneous polarization from 61.55 μC/cm<sup>2</sup> to below 15.50 μC/cm<sup>2</sup>. Analysis of the trends in electronic structure, surface structure, and ionization potentials are reported. This family of materials can be further extended with control of layer thicknesses and choice of compensating halide species.<br>

Hydrothermal synthesis of ABi2Ta2O9Aurivillius phase: A comparative study of A-site cation size on structure, dielectric, optical properties

2021 ◽  
Author(s):  
Ilona Bella ◽  
Tio Putra Wendari ◽  
Novesar Jamarun ◽  
Nandang Mufti ◽  
Zulhadjri
Keyword(s):  
Xrd Analysis ◽  
Aurivillius Phase ◽  
Hydrothermal Route ◽  
Orthorhombic Crystal ◽  
Ionic Radii ◽  
Aurivillius Phases ◽  
Orthorhombic Crystal Structure ◽  
A Site ◽  
Cation Size ◽  
Ferroelectric Transition Temperature

In this study, the double-layered Aurivillius phases CaBi2Ta2O9 (CBT) and PbBi2Ta2O9 (PBT) were prepared through a hydrothermal route with NaOH as a mineralizer. XRD analysis confirmed that the CBT and PBT compounds were successfully formed and adopted an orthorhombic crystal structure with an [Formula: see text]21am symmetry. Le Bail refinements of XRD data indicated that the unit cell volume of CBT was smaller than PBT and is associated with the smaller ionic radius of Ca[Formula: see text] compared to Pb[Formula: see text]. The surface morphology of both samples, as determined using SEM, demonstrated plate-like grains with anisotropic grain growth. It was found that the different ionic radii of [Formula: see text]-site cations (Ca[Formula: see text] and Pb[Formula: see text] strongly affected the structural, optical and electrical properties of the Aurivillius phase. The occupation of smaller Ca[Formula: see text] cations induced a higher structural distortion, which resulted in higher bandgap ([Formula: see text] energy and ferroelectric transition temperature ([Formula: see text] of CBT, compared to those of PBT.

Oxygen-ion Conductivity of Re Tungstates Ln14W4O33 (Ln = Nd, Sm, Gd)

2021 ◽  
Author(s):  
Anna Shlyakhtina ◽  
Nikolay Lyskov ◽  
Sergei Cheryak ◽  
Igor Kolbanev ◽  
Anna Kasyanova ◽  
...  
Keyword(s):  
Ion Conductivity ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion

Doped Ceria Based Solid Oxide Fuel Cell Electrolytes and their Sintering Aspects: An Overview

2016 ◽  
Vol 835 ◽  
pp. 199-236 ◽  
Author(s):  
Pradyot Datta
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Operating Temperature ◽  
Solid Oxide ◽  
Ion Conductivity ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion

Depletion of fossil fuel at an alarming rate is a major concern of humankind. Consequently, researchers all over the world are putting a concerted effort for finding alternative and renewable energy. Solid oxide fuel cell (SOFC) is one such system. SOFCs are electrochemical devices that have several advantages over conventional power generation systems like high efficiency of power generation, low emission of green house gases and the fuel flexibility. The major research focus of recent times is to reduce the operating temperature of SOFC in the range of 500 to 700 °C so as to render it commercially viable. This reduction in temperature is largely dependent on finding an electrolyte material with adequate oxygen ion conductivity at the intended operating temperature. One much material is Gadolinia doped Ceria (CGO) that shows very good oxygen ion conductivity at the intended operation temperature. The aim of this overview is to highlight the contribution that materials chemistry has made to the development of CGO as an electrolyte.

Processing and Electrochemical Properties of Mixed Conducting Lat-xAxCo1-yFeyO3-δ (A=Sr, Ca)

1994 ◽  
Vol 369 ◽  
Author(s):  
W. J. Weber ◽  
J. W. Stevenson ◽  
T. R. Armstrong ◽  
L. R. Pederson ◽  
J. J. Kingsley
Keyword(s):  
Perovskite Structure ◽  
Applied Field ◽  
Synthesis Method ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion ◽  
Electrical Conductivities ◽  
Permeation Studies ◽  
Thermogravimetric Studies ◽  
Increasing Temperature ◽  
Significant Flux

AbstractPowder compositions in the series Lat-xAxCo1-yFeyO3-δ (A=Sr, Ca) have been prepared by a combustion synthesis method. Sintering of pressed powders produced high-density test specimens with the perovskite structure. The specimens exhibited high electrical conductivities with appreciable oxygen-ion conductivity that increased with Co content for the compositions studied. Oxygen permeation studies showed a significant flux of oxygen that increased with temperature for specimens in a P(O2) gradient with no applied field. Thermogravimetric studies of the Lat-xCo0.2Fe0.8O3-δ system indicated a reversible mass loss with increasing temperature that increased with Sr content.

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