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.

Mixed Ionic-Electronic Conduction in Pyrochlore Oxides

1990 ◽  
Vol 210 ◽  
Author(s):  
M. Spears ◽  
S. Kramer ◽  
P.K. Moon ◽  
H.L. Tuller
Keyword(s):  
Electronic Transport ◽  
Ionic Conduction ◽  
Structural Disorder ◽  
Electronic Conduction ◽  
Transport Parameters ◽  
Oxygen Ion Conductivity ◽  
Chemical Models ◽  
Oxygen Ion ◽  
Electrochemical Devices ◽  
Low X

AbstractThe transport properties of the pyrochlore solid solution Gd2(ZrxTil-x)2O7 are investigated to clarify the relationships between composition, structural disorder and ionic and electronic transport. The oxygen ion conductivity has been found to increase sharply with increasing Zr content, x, due to enhanced structural disorder, leading to intrinsic ionic conduction at large values ofx. In contrast, the n—type conductivity predominant at low x, decreases sharply above x=0.2. Defect chemical models are presented to account for the simultaneous contributions of both intrinsic and dopant induced disorder. These models are applied to the σ(T, PO2, dopant) data to extract key thermodynamic and transport parameters. The significance of these parameters and the potential application of these materials in electrochemical devices are discussed.

scholarly journals Reduced ionic conductivity in biaxially compressed ceria

RSC Advances ◽  
2014 ◽  
Vol 4 (41) ◽  
pp. 21625-21630 ◽  
Author(s):  
Weida Shen ◽  
Jun Jiang ◽  
Joshua L. Hertz
Keyword(s):  
Thin Film ◽  
Ionic Conductivity ◽  
Compressive Strain ◽  
Ion Conductivity ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion

Thin film multilayers composed of Y2O3-doped CeO2(YDC) with CeO2, with Ce0.70Zr0.30O2(CZO30), or with Ce0.55Zr0.45O2(CZO45) were fabricated to systematically quantify the effect of biaxial compressive strain on oxygen ion conductivity in YDC.

Strain-modified ionic conductivity in rare-earth substituted ceria: effects of migration direction, barriers, and defect-interactions

2021 ◽  
Author(s):  
George F. Harrington ◽  
Sunho Kim ◽  
Kazunari Sasaki ◽  
Harry L. Tuller ◽  
Steffen Grieshammer
Keyword(s):  
Rare Earth ◽  
Ionic Conductivity ◽  
Computational Study ◽  
Ion Conductivity ◽  
Oxygen Ion Conductivity ◽  
Migration Direction ◽  
Oxygen Ion ◽  
Defect Interactions

The effects of migration direction, barriers, and defect-interactions on the strain-modified oxygen-ion conductivity in rare-earth substituted ceria are deconvoluted in this combined experimental and computational study.

Raman Spectroscopy and Structural Disorder in Gd2(ZrxTi1−x)2O7

1988 ◽  
Vol 135 ◽  
Author(s):  
M. Oueslati ◽  
M. Balkanski ◽  
P.K. Moon ◽  
H.L. Tuller
Keyword(s):  
Solid Solution ◽  
Pyrochlore Structure ◽  
Structural Disorder ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxygen Ion ◽  
Frequency Independent ◽  
Frenkel Defects ◽  
End Members ◽  
Peak Widths

AbstractRaman measurements on the Gd2(ZrxTi1−x)2O7, solid solution show increasing peak widths as the composition is varied from Gd2Ti2O7, to Gd2Zr2,O7. The increase in peak width is interpreted as reflecting an increase in structural disorder with increasing x in this pyrochlore structure material. Structural disorder occurs readily in such oxides by the formation of cation anti-site defects and anion frenkel defects. We have previously observed that this leads to a marked increase in oxygen ion conduction with increasing x. Preliminary results also indicate that certain peaks in the Raman spectra are characteristic of the end members of the solid solution and may occur at the same frequency independent of composition. The Raman results are discussed in relation to earlier x-ray diffraction and ionic conductivity data obtained in this group.

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.

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.

scholarly journals Ionic conductivity of YSZ/CZO multilayers with variable lattice mismatch

2015 ◽  
Vol 3 (5) ◽  
pp. 2378-2386 ◽  
Author(s):  
Weida Shen ◽  
Joshua L. Hertz
Keyword(s):  
Ionic Conductivity ◽  
Tensile Strain ◽  
Lattice Mismatch ◽  
Ion Conductivity ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion

Tensile strain in yttria-stabilized zirconia (YSZ) exhibited little impact on oxygen ion conductivity in multilayers composed of YSZ and Ce1−xZrxO2 (CZO).

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.

The Relationship Between Suicidal Thinking and Dating Violence in a Sample of Adolescent Abortion Patients

Crisis ◽  
2011 ◽  
Vol 32 (5) ◽  
pp. 246-253 ◽  
Author(s):  
Gretchen E. Ely ◽  
William R. Nugent ◽  
Julie Cerel ◽  
Mholi Vimbba
Keyword(s):  
Unintended Pregnancy ◽  
Dating Violence ◽  
Young Women ◽  
Psychosocial Problems ◽  
The Other ◽  
Assessment Scale ◽  
Adolescent Dating Violence ◽  
Adolescent Relationships ◽  
Suicidal Thinking ◽  
The Relationship

Background: The relationship between suicidal thinking and adolescent dating violence has not been previously explored in a sample of adolescent abortion patients. Aims: This paper highlights a study where the relationship between dating violence and severity of suicidal thinking was examined in a sample of 120 young women ages 14–21 seeking to terminate an unintended pregnancy. Methods: The Multidimensional Adolescent Assessment Scale and the Conflict in Adolescent Relationships Scale was used to gather information about psychosocial problems and dating violence so that the relationship between the two problems could be examined, while controlling for the other psychosocial problems. Results: The results suggest that dating violence was related to severity of suicidal thinking, and that the magnitude of this relationship was moderated by the severity of problems with aggression. Conclusions: Specifically, as the severity of participant’s general problems with aggression increased, the magnitude of the relationship between dating violence and severity of suicidal thinking increased. Limitations of the study and implications for practice are discussed.

Emotional Impact Feedback Changes How We Remember Negative Autobiographical Experiences

2010 ◽  
Vol 57 (5) ◽  
pp. 354-359 ◽  
Author(s):  
Melanie K. T. Takarangi ◽  
Deryn Strange
Keyword(s):  
Well Being ◽  
The Other ◽  
Personal Perspective ◽  
Emotional Impact ◽  
Potential Mechanism ◽  
Negative Experiences ◽  
Negative Memory ◽  
The Relationship ◽  
Negative Memories ◽  
Over Time

When people are told that their negative memories are worse than other people’s, do they later remember those events differently? We asked participants to recall a recent negative memory then, 24 h later, we gave some participants feedback about the emotional impact of their event – stating it was more or less negative compared to other people’s experiences. One week later, participants recalled the event again. We predicted that if feedback affected how participants remembered their negative experiences, their ratings of the memory’s characteristics should change over time. That is, when participants are told that their negative event is extremely negative, their memories should be more vivid, recollected strongly, and remembered from a personal perspective, compared to participants in the other conditions. Our results provide support for this hypothesis. We suggest that external feedback might be a potential mechanism in the relationship between negative memories and psychological well-being.

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