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Showing 1–17 of 17 results
Advanced filters: Author: Gustau Catalan Clear advanced filters

  • Semiconducting single crystals of doped barium titanate and titanium dioxide exhibit a flexoelectric-like response upon bending that is much larger than in their undoped, insulating counterparts, reaching unprecedentedly large effective flexoelectric coefficients.

    • Jackeline Narvaez
    • Fabian Vasquez-Sancho
    • Gustau Catalan
    Research
    Nature
    Volume: 538, P: 219-221

  • At equilibrium, the ferroelectric polarization is proportional to the strain. At ultrafast timescales, an above-bandgap laser excitation decouples strain and polarization, which, out of equilibrium, is mainly determined by the photoexcited electrons.

    • Le Phuong Hoang
    • David Pesquera
    • Giuseppe Mercurio
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-10

  • Electric dipoles are common in insulators, but extremely rare in metals. This situation may be about to change, thanks to flexoelectricity.

    • Gustau Catalan
    News & Views
    Nature Physics
    Volume: 20, P: 358-359

  • The experimental detection of negative capacitance in ferroelectrics rekindles hopes that the phenomenon could be used to further push the miniaturization of conventional transistors.

    • Gustau Catalan
    • David Jiménez
    • Alexei Gruverman
    News & Views
    Nature Materials
    Volume: 14, P: 137-139

  • Piezoresponse force microscopy (PFM) is widely used to study piezoelectric properties of materials. Here, the authors not only show that PFM measurements will yield a signal even in non-piezoelectric materials via induced flexoelectricity, but also introduce a protocol to distinguish these from real signals.

    • Amir Abdollahi
    • Neus Domingo
    • Gustau Catalan
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-6

  • A crystal’s surface has been found to behave as a distinct material that has temperature-dependent electrical polarization — despite the rest of the crystal being non-polar.

    • Gustau Catalan
    • Beatriz Noheda
    News & Views
    Nature
    Volume: 575, P: 600-602

  • Topological phenomena in ferroelectrics such as vortices are of interest as they may be useful for high-density storage applications, but similar phenomena have not been seen in antiferroelectrics, which possess antipolar dipole arrangements. Here, using electron microscopy, topological antivortices and faint vortices are seen in the prototypical antiferroelectric PbZrO3.

    • Ying Liu
    • Huazhang Zhang
    • Gustau Catalan
    Research
    Nature Materials
    Volume: 24, P: 1359-1363

  • Ice is not piezoelectric, despite the polarity of water molecules, but bending ice may produce electricity. This has now been experimentally demonstrated, with a flexoelectric coefficient comparable to that of common ceramic materials.

    • X. Wen
    • Q. Ma
    • G. Catalan
    Research
    Nature Physics
    Volume: 21, P: 1587-1593

  • The interaction of flexoelectric polarization arising from strain gradients with ferroelectricity impacts tribological properties and facilitates fine physical lithography without masks or chemicals, with potential applications in various fields.

    • Seongwoo Cho
    • Iaroslav Gaponenko
    • Seungbum Hong
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-10

  • By doping ice with NaCl, it is shown that a flexoelectric coefficient of up to 10 μC m−1 is generated, enabling effective piezoelectric coefficients that are comparable to those of ceramics. This arises from the streaming current of quasi-liquid flow through grain boundaries from one side of the sample to the other.

    • X. Wen
    • Q. Ma
    • G. Catalan
    Research
    Nature Materials
    Volume: 24, P: 1533-1537

  • Father of modern ferroelectrics.

    • Gustau Catalan
    • Matthew Dawber
    • Pavlo Zubko
    Comments & Opinion
    Nature Materials
    Volume: 19, P: 580

  • Cantilevers made of SrTiO3 grown on silicon use the flexoelectric effect to achieve electromechanical performances similar to piezoelectric bimorph cantilevers.

    • Umesh Kumar Bhaskar
    • Nirupam Banerjee
    • Gustau Catalan
    Research
    Nature Nanotechnology
    Volume: 11, P: 263-266

  • The close relationship between crystal structure and electric polarization in ferroelectrics means that strain strongly influences their properties. The demonstration of how strain gradients leading to a higher-order effect, flexoelectricity, can be used to rotate electric polarization in thin films indicates new ways of controlling piezoelectricity by purely mechanical means.

    • G. Catalan
    • A. Lubk
    • B. Noheda
    Research
    Nature Materials
    Volume: 10, P: 963-967

  • Flexoelectricity is the ability of materials to generate electricity upon bending. Here it is demonstrated that adding light to mechanical oscillation enhances effective flexoelectric coefficients by orders of magnitude, with the halide perovskites showing the largest coefficients.

    • Longlong Shu
    • Shanming Ke
    • Gustau Catalan
    Research
    Nature Materials
    Volume: 19, P: 605-609