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Showing 1–8 of 8 results
Advanced filters: Author: Emmanuel Defay Clear advanced filters

  • A macroscopic and scalable pyroelectric energy harvester in the form of multilayer capacitors produces 11.2 J of electrical energy, with a pyroelectric material generating up to 4.43 J cm−3 per cycle.

    • Pierre Lheritier
    • Alvar Torelló
    • Emmanuel Defay
    ResearchOpen Access
    Nature
    Volume: 609, P: 718-721

  • The intrinsic efficiency of electrocaloric materials has been largely overlooked. Here, the authors use the parameter materials efficiency as the figure of merit to rank caloric materials, reporting on the materials efficiency of highly ordered bulk lead scandium tantalate PST.

    • Youri Nouchokgwe
    • Pierre Lheritier
    • Emmanuel Defay
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-7

  • Magnetocaloric and electrocaloric effects are driven by doing work, but this work has barely been explored, even though these caloric effects are being exploited in a growing number of prototype cooling devices.

    • Xavier Moya
    • Emmanuel Defay
    • Neil D. Mathur
    Comments & Opinion
    Nature Physics
    Volume: 11, P: 202-205

  • Acoustic haptic technology enhances touch interfaces but often relies on opaque, toxic lead-based ceramics. Here, the authors develop a transparent, lead-free piezoelectric device using potassium sodium niobate and conductive oxide films, achieving superior transmittance and effective acoustic resonance, offering a promising alternative for safer, more versatile haptic applications.

    • Longfei Song
    • Sebastjan Glinsek
    • Emmanuel Defay
    ResearchOpen Access
    Communications Materials
    Volume: 6, P: 1-6

  • Electrocaloric materials can be electrically driven to pump heat and hold promise for use in efficient solid-state refrigeration. Here, the authors demonstrate an approach to recycle recoverable energy from electrocaloric cycles, offering a method to enhance performance in electrocaloric refrigeration systems.

    • E. Defay
    • R. Faye
    • N. D. Mathur
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-9

  • Direct growth of piezoelectric oxides on glass is difficult due to high processing temperatures. Here, the authors demonstrate a flash lamp process for the growth of films on various glasses in a few seconds only. The films have piezoelectric e33,f of −5 C m−2 and can be used in haptic devices.

    • Longfei Song
    • Juliette Cardoletti
    • Sebastjan Glinšek
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-9

  • HfO2 is a promising ferroelectric material for applications in electronics but knowledge on its ferroic and electromechanical response properties is still lacking. Here, the authors demonstrate the peculiar piezoresponse of HfO2, predicting on how to reverse its sign by means of a biaxial strain.

    • Sangita Dutta
    • Pratyush Buragohain
    • Jorge Íñiguez
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-10