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Meeting MS&T21: Materials Science & Technology
Symposium Journal of the American Ceramic Society Awards Symposium
Presentation Title In-Situ Resistance Degradation & Switching of Bulk YSZ & STO Single Crystals
Author(s) Ana Alvarez, I-Wei Chen
On-Site Speaker (Planned) Ana Alvarez
Abstract Scope While Y-stabilized zirconia (YSZ) is a fast oxygen conductor and Fe-doped strontium titanate (STO) a p-type semiconductor, representing two extremes of oxide conductors, surprisingly their DC electrical degradation, or resistance breakdown, in highly accelerated lifetime tests (HALT) is phenomenologically indistinguishable. Our more detailed study, however, revealed that YSZ degrades by raising the electron chemical potential at the redox boundary to reach a two-phase, thermodynamic, metal-insulator transition level, even though the insulator side remains mostly unchanged. In contrast, STO forms a p-n junction by oxygen vacancy demixing, but the late-stage-demixing kinetics can be so sluggish that the steady state is not reached in low-temperature HALT. In STO, in particular, needle-like degradation paths often form, which explains the strong field dependence and large variation of lifetimes. These results provide new insight on related processes, such as flash sintering and melt processing of ceramics as well as resistance memory of oxide thin films.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Novel Strategy to Strengthen Alumina-carbon Refractories for Flow Control of Molten Steel
A Thermodynamics-guided Framework to Design Spherical Lightweight Aggregate from Waste Coal Combustion Ash
Direct Ink Writing (DIW) of Hierarchical Porous Alumina Stabilized Emulsions: Rheology and Printability
Domain Walls in Ferroelectrics
Effect of Moisture on the Oxidation Behaviour of ZrB2.
In-Situ Resistance Degradation & Switching of Bulk YSZ & STO Single Crystals
Processing of MAX Phases: From Synthesis to Applications
Relaxor Characteristics and Electromechanical Response under High Field for Sodium BismuthTtitanate-based Ceramics

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