Zhuo, Fangping ; Zhou, Xiandong ; Dietrich, Felix ; Soleimany, Mehrzad ; Breckner, Patrick ; Groszewicz, Pedro B. ; Xu, Bai-Xiang ; Buntkowsky, Gerd ; Rödel, Jürgen (2024)
Dislocation density-mediated functionality in single-crystal BaTiO3.
In: Advanced Science
doi: 10.1002/advs.202403550
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Unlike metals wheredislocationscarrystrain singularitybut no charge, dislocationsinoxideceramicsare characterized bybotha strain field and a localcharge witha compensating charge envelope. Oxide ceramicswiththeir deliberate engineeringand manipulationarepivotalinnumerousmodern technologies such assemiconductors, superconductors, solar cells, and ferroics.Dislocations facilitateplastic deformationinmetals and leadto a monotonous increase inthe strength ofmetallicmaterialsinaccordance with the widelyrecognized Taylorhardeninglaw.However,achievingthe objective oftailoring the functionality ofoxide ceramicsbydislocation density still remainselusive.Hereastrategytoimprintdislocationswith{100}<100>slip systems and atenfold change in dislocationdensity ofBaTiO3 single crystals usinghigh-temperature uniaxialcompressionare reported.Througha dislocation density-based approach,dielectric permittivity,converse piezoelectriccoefficient, and alternating currentconductivity aretailored, exhibiting apeak atmedium dislocationdensity. Combined with phase-field simulationsand domainwallpotential energy analyses, the dislocation-density-based design inbulk ferroelectricsismechanistically rationalized.These findings mayprovidea new dimensionforemploying plasticstrainengineeringto tune the electrical propertiesofferroics, potentiallypavingthe wayforadvancing dislocationtechnology infunctional ceramics.

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