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Ferroelectric-ferroelectric transitions Induced by External STress for Applications in sensing and energy harvesting – FIESTA

Taking advantage of nonlinear phase transitions for efficient microgenerators and adaptive acoustic filters

FIESTA aims at investigating stress-induced ferroelectric-ferroelectric phase transitions in ferroelectric/piezoelectric materials with two target applications developed throughout of the project: tunable acoustic filters with frequency hopping feature and small-scale energy harvesting devices for self-powered systems. The project finds its motivations both in socio-economic challenges (sustainable energy source, integration…) and associated scientific questions.

Phase transitions in ferroelectrics: from unwanted characteristics to an asset for small-scale energy harvesting and tunable acoustic filters

FIESTA fosters transdisciplinary approaches and genuine scientific researches related to societal stakes. The project encompasses all the involved fields, from the material to the application through mechanical and electrical aspects. The core of FIESTA is to turn what is usually considered as a limitation (phase transition in ferroelectrics) into advantages for obtaining telecommunication filters able to provide frequency hopping as well as ultra-efficient mechanical energy harvesting devices (a decade above state of the art). The objective is to investigate these stress-induced phase transitions in ferroelectrics and combine them with mechanical and electrical aspects to obtain globally optimized systems. Hence, interfaces between each field will be of prior importance leading to relevant scientific advances. Particularly, the combination of intrinsic material nonlinearities with induced ones from electrical interface through the mechanical structure, yielding multiscale nonlinearities, is an innovative aspect of FIESTA.<br />In addition to these global advances, FIESTA will also provide relevant scientific progresses in each of the research fields. On the material side, that provides a common ground to the other axes, the project aims at understanding the mechanisms related to stress-induced phase transitions and develop appropriate materials accordingly. The project will encompass ceramics and crystal films, more particularly using KTN due to their Curie temperature close to room temperature (facilitating phase transition) and polymers (PVDF and its derivative) that require lower stress. On the structural aspects, ways of converting strain inputs into significant stress will be developed. Taking advantage of the unique properties of the developed materials, electrical aspects will provide innovative auto-synchronous converters that allow virtuous energy cycles along with cold-start capabilities thanks to remnant polarization of the material after transition.

The transdisciplinary and global approach includes material, mechanical and electrical aspects, interacting each other for a successful co-design. The project is decomposed into one administrative Work Package (“WP” - WP0: Project management), 3 scientific WPs (WP2: Material selection, processing and optimization, WP3: Structure design and WP4: Electrical interface) and 2 technical WPs (WP1: Specifications and requirements and WP5: System integration & demonstration) located upstream and downstream to scientific WPs. WPs include all partners as they feature numerous interactions (with particular attentions to avoid deadlocks) to ensure a smooth project flow:
- WP2 (material) and WP3 (structure) interfaces: mechanical and structural characteristics of the material (transition conditions, max stress, dimensions…) will be provided to adequately design the structure. Conversely, constraints in WP3 will guide WP2’s material selection and elaboration.
- WP2 (material) and WP4 (electrical) interfaces: material electrical characteristics (dielectric constants, breakdown…) will provide guidelines for the electrical design in WP4. Circuit requirements of WP4 (minimal capacitance and variations, working voltage…) will help in the material design. Cross-interactions in terms of material intrinsic nonlinearities and nonlinearities brought by the circuit (yielding multiscale nonlinearities) will be at the heart of this interface.
- WP3 (structure) and WP4 (electrical) interfaces: characteristics from a system level (capacitances and their variations, output voltage…) will guide the development of the electrical interface. Characteristics of the latter (input impedance, starting conditions…) will help the structure design.

The project having started very recently, this part is still under investigation!

As a transdisciplinary project, FIESTA will enable outcomes at multiscale levels (material, structural, electrical). This includes a fine understanding of composition and process effect on stress-induced transitions. As FIESTA aims at easily reaching these transitions, it provides a disruptive way of thinking by taking advantage of what is usually regarded as a limitation. On the structural side, architectures for converting relative high strain into high stress will be proposed, allowing a better match between the application and the material. On the electrical aspect, synchronous converters show significant advantages to address one important limitations of passive devices: the need of external polarization. Extending this concept to ferroelectric materials will be a further step towards highly integrable microgenerators.
The project also encompasses in a global way a system, considering material, structural and electrical aspects. For instance, the combination of synchronous converters with phase transitions in materials yields non-trivial operations due to their interactions, including cross-nonlinearities. This global approach, providing significant knowledge at the interfaces, will allow cutting-edge results and insights in material, structural and electrical developments. FIESTA itself is defined by this statement, as it proposes to lower the transitional stress, which is usually viewed as a degradation, eventually to significantly enhance the system.
FIESTA also features a strong will in terms of education through research. This will thus shape next generation of researchers with open mind and ability to thinking outside their own field.
Finally, FIESTA resolutely aims at addressing socio-economical stakes. To this end dedicated demonstrators for energy harvesting and telecommunication filters will be proposed.

The project having started very recently, this part is still under investigation!

FIESTA aims at investigating stress-induced ferroelectric-ferroelectric phase transitions in ferroelectric/piezoelectric materials with two target applications developed throughout of the project: tunable acoustic filters with frequency hopping feature and small-scale energy harvesting devices for self-powered systems.
The project finds its motivations both in socio-economic challenges and associated scientific questions. Regarding the first aspect, the advent of new wireless devices (e.g., 5G or Internet of Things) has confirmed the issues of integration and energy supply. More precisely, reducing the number of filters required for frequency selection would drastically improve the integration while decreasing power consumption. Meanwhile, energy harvesting, aiming at providing viable and long-lasting energy supply when conventional batteries cannot satisfy such requirements (e.g., remote/confined or relatively harsh environments), has emerged with the spreading of distributed wireless sensor networks. Yet, output power of microgenerators may not always ensure reliable operation of energy source.
To address these challenges, FIESTA fosters transdisciplinary approaches and genuine scientific researches related to societal stakes. The project, including 3 scientific Work Packages and 2 technical ones, encompasses all the involved fields, from material (WP2) to application (WP1, WP5) through mechanical (WP3) and electrical (WP4) aspects, for the completion of its targets. The core of FIESTA is to turn what is usually considered as a limitation (phase transition in ferroelectrics) into advantages for obtaining telecommunication filters able to provide frequency hopping as well as ultra-efficient mechanical energy harvesting devices (a decade above state of the art). The objective is to investigate these stress-induced phase transitions in ferroelectrics and combine them with mechanical and electrical aspects to obtain globally optimized systems. Hence, interfaces between each field will be of prior importance leading to relevant scientific advances. Particularly, the combination of intrinsic material nonlinearities with induced ones from electrical interface through the mechanical structure, yielding multiscale nonlinearities, is an innovative aspect of FIESTA.
In addition to these global advances, FIESTA will also provide relevant scientific progresses in each of the research fields. On the material side, that provides a common ground to the other axes, the project aims at understanding the mechanisms related to stress-induced phase transitions and develop appropriate materials accordingly. The project will encompass ceramics and crystal films, more particularly using KTN due to their Curie temperature close to room temperature (facilitating phase transition) and polymers (PVDF and its derivative) that require lower stress. On the structural aspects, ways of converting strain inputs into significant stress will be developed, through inverse flextensor structure, or impacting device featuring frequency-up conversion. Taking advantage of the unique properties of the developed materials, electrical aspects will provide innovative auto-synchronous converters that allow virtuous energy cycles along with cold-start capabilities thanks to remnant polarization of the material after transition.
FIESTA consortium includes partners with internationally recognized expertise and significant experience in project management. They also show a strong, timely and cutting edge will for promoting transdisciplinary researches, with very good knowledge of interfaces between disciplines.
FIESTA outcomes encompass both genuine scientific aspects, through transdisciplinary innovative researches as well as cutting-edge advances in each of the involved respective fields, as well as a strong applicative will by targeting devices related to current challenges in energy field.

Project coordination

Mickaël LALLART (LABORATOIRE DE GENIE ELECTRIQUE ET FERROELECTRICITE)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

EA682 LABORATOIRE DE GENIE ELECTRIQUE ET FERROELECTRICITE
FEMTO-ST INSTITUT FRANCHE-COMTE ELECTRONIQUE MECANIQUE THERMIQUE ET OPTIQUE - SCIENCES ET TECHNOLOGIES
ELyTMaX Science & Engineering Lyon, Tohoku Materials & systems under eXtreme conditions
UPSaclay - C2N Universitté Paris-Saclay - C2N

Help of the ANR 579,136 euros
Beginning and duration of the scientific project: October 2020 - 42 Months

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