Dislocation-mediated electronic conductivity in rutile

Muhammad, Qaisar Khushi; Bishara, Hanna; Porz, Lukas; Dietz, Christian; Ghidelli, Matteo; Dehm, Gerhard; Frömling, Till

doi:10.1016/j.mtnano.2021.100171

Cited by 10 publications

(29 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…53,69 The effect on conductivity even varies with the length scale where higher conductivities and lower activation energies can be observed at small length scales. 70 Only recently introduced, but already covered in a review, 71 a conceptual framework 53 categorizing the possible influence parameters into mesoscopic structure, core structure and space charge has been established, 53 see Figure 2B.…”

Section: Impact Of Dislocations On Functional Propertiesmentioning

confidence: 99%

“…Similarly, recovery was used to localize dislocations into bundles in TiO 2 turning their behavior from acceptor-to donor-like. 69,70,212 Moreover, the multitude of multiplication mechanisms and their effect on the overall motion needs to be understood as any of them can be the key limitation for certain properties, such as overall ductility. For example, if a polycrystalline ceramic is quasi dislocation free before high-temperature deformation, where do the dislocations originate from, how do they multiply and how do grains influence each other?…”

Section: Limitation By Necessity Of Nucleationmentioning

confidence: 99%

“…Here, the mechanical deformation parameters chosen, either allowing recovery or excluding it, tailor the mesoscopic structure which then is the key factor in determining the final conductivity 53,69 . The effect on conductivity even varies with the length scale where higher conductivities and lower activation energies can be observed at small length scales 70 . Only recently introduced, but already covered in a review, 71 a conceptual framework 53 categorizing the possible influence parameters into mesoscopic structure, core structure and space charge has been established, 53 see Figure 2B.…”

Section: Introductionmentioning

confidence: 99%

“…. Similarly, recovery was used to localize dislocations into bundles in TiO 2 turning their behavior from acceptor‐ to donor‐like 69,70,212 …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

60 years of dislocations in ceramics: A conceptual framework for dislocation mechanics in ceramics

Porz

2022

Int J Ceramic Engine & Sci

View full text Add to dashboard Cite

High‐tech ceramics are typically engineered by controlling point defects and interfaces while one‐dimensional dislocations have found much less attention so far. Nevertheless, their impact on almost any functional property and the sudden ease to fabricate them with novel synthesis methods, such as rapid densification, brings spotlight attention to dislocations as design dimension. Although the typical brittleness of ceramics insinuates the irrelevance of dislocations for mechanical behavior, abundant literature is spread over materials, decades, and disciplines, however, often unconnected. Here, a conceptual framework for dislocation mechanics in ceramics separated into five logical aspects, (1) fundamental mobility, (2) obstacles to motion, (3) limitation by necessity of nucleation, (4) motion complexity, and (5) avoidance of competing mechanisms, brings oversight into the complex behavior. In consequence, quicker identification of the limiting step allows to estimate the potential involved more precisely and to identify open research questions with greater ease. An introduction to dislocations and the functionality involved, a look back over the last six decades, and highlights of open question are dedicated to provide a framework and bridge the gap between the attached research fields.

show abstract

Section: Impact Of Dislocations On Functional Propertiesmentioning

confidence: 99%

Section: Limitation By Necessity Of Nucleationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…. Similarly, recovery was used to localize dislocations into bundles in TiO 2 turning their behavior from acceptor‐ to donor‐like 69,70,212 …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

60 years of dislocations in ceramics: A conceptual framework for dislocation mechanics in ceramics

Porz

2022

Int J Ceramic Engine & Sci

View full text Add to dashboard Cite

show abstract

“…Dislocations as one-dimensional defects have been typically associated with influencing the mechanical properties of ceramics. , Nevertheless, they have rarely been discussed as a tool for purposeful tailoring the functional properties of ceramics. − This is mainly because inducing high dislocation density is rather challenging, as most ceramics are not easily deformable . The exciting examples, however, include tailoring the electronic and/or ionic conductivity in ceramics, , resistive switching phenomena, photoelectric properties, and ferroelectric and thermoelectric behavior in bulk materials . We could already establish a conceptional framework for influencing factors of dislocations on functional properties .…”

mentioning

confidence: 99%

Dislocation-Mediated Oxygen–Ionic Conductivity in Yttria-Stabilized Zirconia

et al. 2022

View full text Add to dashboard Cite

Yttria-stabilized zirconia (YSZ) has become an indispensable solid electrolyte material in modern solid oxide fuel and electrolysis cells (SOFCs/SOECs) as well as oxygen sensors. The oxygen ionic conductivity of YSZ is among the highest known so far. For energy efficiency optimization of SOFCs and lowering the high-temperature degradation of electrodes, the oxygen ionic conductivity needs to be further enhanced. This would allow for a reduction in application temperature. Despite extensive regular point defect-doping strategies, this key issue remains unsolved. Here, we investigate the role of mechanically induced dislocations (line-defects) on electrical conductivity and oxygen transport in bulk YSZ. An advanced mechanical deformation approach is employed to generate distinctly aligned dislocation-rich and -deficient regions. The in-depth electrical characterization of these regions exhibited highly conducting effects of dislocation-induced strain inside the bulk material. Furthermore, targeted oxygen tracer diffusion experiments prove enriched oxygen incorporation within the dislocation bundles. Therefore, the potential of mechanically induced dislocations is elucidated as a design element to tune the bulk ionic transport in YSZ.

show abstract

Characterisation of damage by means of electrical measurements: Numerical predictions

Güzel,

Kaiser,

Lücker

et al. 2023

Proc Appl Math and Mech

View full text Add to dashboard Cite

Understanding damage mechanisms and quantifying damage is important in order to optimise structures and to increase their reliability. To achieve this goal, experimental‐ and simulation‐based techniques are to be combined. Different methods exist for the analysis of damage phenomena such as fracture mechanics, phase field models, cohesive zone formulations and continuum damage modelling. Assuming a typical ‐type damage formulation, the governing equations of continua that account for gradient‐enhanced ductile damage under mechanical and electrical loads are derived. The mechanical and electrical sub‐problems give rise to the local form of the balance equation of linear momentum, the micromorphic balance relation and the continuity equation for the electric charge, respectively. Experimental investigations indicate that changes in electrical conductivity arise due to the evolution of the underlying microstructure, for example, of cracks and dislocations. Therefore, motivated by deformation‐induced property changes, the effective electrical conductivity is assumed to be a function of the damage variable. This eventually allows the prediction of experimentally recorded changes in the electrical resistance due to mechanically‐induced damage processes. Interpreting the resistivity as a fingerprint of the material microstructure, the simulation approach proposed in the present work contributes to the development of non‐destructive electrical‐resistance‐based characterisation methods. To demonstrate the applicability of the proposed framework, different representative simulations are studied.

show abstract

Dislocation-mediated electronic conductivity in rutile

Cited by 10 publications

References 51 publications

60 years of dislocations in ceramics: A conceptual framework for dislocation mechanics in ceramics

60 years of dislocations in ceramics: A conceptual framework for dislocation mechanics in ceramics

Dislocation-Mediated Oxygen–Ionic Conductivity in Yttria-Stabilized Zirconia

Characterisation of damage by means of electrical measurements: Numerical predictions

Contact Info

Product

Resources

About