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Flexoelectric Fracture-Ratchet Effect in Ferroelectrics
CSIC, Catalan Inst Nanosci & Nanotechnol, Campus UAB, Barcelona 08193, Spain.;BIST, Campus UAB, Barcelona 08193, Spain.;Univ Geneva, DPMC MaNEP, Quai Ernest Ansermet 24, CH-1211 Geneva, Switzerland..
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0001-7306-0272
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0003-2070-9167
UAB, Dept Fis, Edifici Cc, E-08193 Bellaterra, Spain.;ICREA, Pg Lluis Co 23, E-08010 Barcelona, Catalonia, Spain..
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 13, article id 135502Article in journal (Refereed) Published
Abstract [en]

The propagation front of a crack generates large strain gradients and it is therefore a strong source of gradient-induced polarization (flexoelectricity). Herein, we demonstrate that, in piezoelectric materials, a consequence of flexoelectricity is that crack propagation is helped or hindered depending on whether it is parallel or antiparallel to the piezoelectric polar axis. The discovery of crack propagation asymmetry proves that fracture physics cannot be assumed to be symmetric in polar materials, and indicates that flexoelectricity should be incorporated in any realistic model.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 122, no 13, article id 135502
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Physical Sciences
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URN: urn:nbn:se:kth:diva-249790DOI: 10.1103/PhysRevLett.122.135502ISI: 000463900300007Scopus ID: 2-s2.0-85064039748OAI: oai:DiVA.org:kth-249790DiVA, id: diva2:1306660
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QC 20190424

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-04-24Bibliographically approved

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Kianirad, HodaCanalias, Carlota

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