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175 results on '"Sebald, G."'

1. Electromechanical properties of ferroelectric polymers: Finsler geometry modeling and a Monte Carlo study

Author

Egorov, V., Maksimova, O., Koibuchi, H., Bernard, C., Chenal, J-M., Lame, O., Diguet, G., Sebald, G., Cavaille, J-Y., and Takagi, T.

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Polyvinylidene difluoride (PVDF) is a ferroelectric polymer characterized by negative strain along the direction of the applied electric field. However, the electromechanical response mechanism of PVDF remains unclear due to the complexity of the hierarchical structure across the length scales. As described in this letter, we employ the Finsler geometry model as a new solution to the aforementioned problem and demonstrate that the deformations observed through Monte Carlo simulations on 3D tetrahedral lattices are nearly identical to those of real PVDF. Specifically, the simulated mechanical deformation and polarization are similar to those observed experimentally., Comment: 13 pages, 5 figures

Published
2020
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11. Modeling of Olsen cycle for pyroelectric energy harvesting and assessment of abnormal electrocaloric effect in ferroelectric single crystals.

Author

Taxil, G., Lallart, M., Ducharne, B., Nguyen, T. T., Kuwano, H., Ono, T., and Sebald, G.

Subjects
ENERGY harvesting, PYROELECTRICITY, FERROELECTRICITY, FERROELECTRIC crystals, ELECTRICAL energy, SINGLE crystals
Abstract

The energy conversion potential of ferroelectric materials originating from their phase transitions, in particular temperature ranges and electric field values, is very promising. Pyroelectric energy harvesting consists of directly converting thermal energy into electrical energy. Due to its high energy conversion potential, the Olsen cycle is the most favorable for pyroelectric energy harvesting. This cycle includes two isothermal and two constant electric field branches. In this study, the Olsen cycle was modeled, then varying temperatures and applied electric field directions for different crystal orientations were simulated. Polarization responses were obtained via the Landau–Devonshire theory. Then, an innovative way to model the electrocaloric effect was proposed; experimental results and first-principle calculations confirmed the simulation results. The resulting negative electrocaloric effect due to crystal orientation, previously reported in the literature, has been successfully simulated through a phenomenological approach. Finally, we identified which phase transitions are interesting for pyroelectric energy harvesting applications depending on crystal orientations while obtaining an energy density in the order of ≈ 10 2 mJ / cm 3. This value corresponds to previous results in the literature. [ABSTRACT FROM AUTHOR]

Published
2022
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16. Pragmatism

Author

Viola, Tullio, Berek, M, Chmelar, K, Dimbath, O, Haag, H, Heinlein, M, Leonhard, N, Rauer, V, Sebald, G, Philosophy, and RS: FASoS AMC

Abstract

Aus der Perspektive der sozialtheoretischen Gedächtnisforschung erweisen sich einige Grundideen der pragmatistischen Philosophie als maßgebend. Hervorzuheben sind insbesondere die prozessualistische Auffassung der Erfahrung, die Bedeutung von Gewohnheiten, Symbolen und sozialen Beziehungen als Motor der kulturellen Überlieferung sowie die Betonung der gegenwärtigen Handlungssituation als irreduzibler Ausgangspunkt jeder Rekonstruktion der Vergangenheit. Darüber hinaus hat der Pragmatismus zwei konkrete Beiträge zur soziologischen Theorie des Gedächtnisses inspiriert: George H. Cooleys Theorie des sozialen Nachruhms und Jane Addams' Studie über das Gedächtnis von Frauen.

Published
2021

17. AD-10 Ferromagnetic hysteresis model using fractional derivative resolution developed for the simulation of viscoelastic phenomena

Author

DUCHARNE, Benjamin, SEBALD, G, Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), ELyTMaX, École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Tohoku University [Sendai]-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI]Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2021

21. Fractional equation for the anomalous magnetic diffusion in ferromagnetic (Q2-05)

Author

Ducharne, Benjamin, Deffo, Y, Tsafack, P, Zhang, B, Sebald, G, Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
[PHYS]Physics [physics], [SPI]Engineering Sciences [physics], [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; Ferromagnetic materials are used in a wide range of electromagnetic applications (energy converters, sensors, inductances …). In this domain, we observe a growing interest in the development of simulation tools reducing the experimental campaigns and improving the knowledge and the performances. Accurate simulation results can only be obtained by coupling precise electromagnetic equations to the exact material laws (hysteresis, saturation, frequency dependence) 1-3. Under the influence of an external magnetic excitation, the local magnetic state through the ferromagnetic specimen is ruled by the combination of both the magnetic domain kinetics and the external magnetic field diffusion. The usual methods for the simulation of the magnetic behavior are all based on the separation of the magnetic contributions, where the microscopic Eddy currents due to the domain wall motions and the macroscopic ones due to the extern magnetic field variations are considered separately 4. This separation remains artificial, since practically both losses mechanisms occurs simultaneously and interact on each other 5. In this study, an alternative solution is proposed through the resolution of an anomalous fractional magnetic field diffusion (1, 2 or 3D depending on the experimental situation). The fractional order constitutes an additional degree of freedom in the simulation scheme 6-9. It is identified through comparisons to experimental results. By adjusting precisely this order, very accurate local and global simulation results can be obtained on a very broad frequency bandwidth. It allows to predict precisely the dynamic magnetic behavior of classic ferromagnetic components.

Published
2020

27. Fractional derivatives: from magnetic spectroscopy to high amplitude dynamic hysteresis in soft ferromagnetism

Author

Ducharne, Benjamin, Zhang, B, Deffo, Y, Sebald, G., Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Shandong University, University of Buéa, ELyTMaX, École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Tohoku University [Sendai]-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI]Engineering Sciences [physics], Cole-Cole model, fractional derivatives, frequency dependence, Hysteresis, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; Considering harmonic evolution of the magnetic induction field, we establish a link between a time domain, high amplitude, fractional hysteresis model and the frequency domain, weak amplitude, fractional, ferromagnetic Cole-Cole model. A relation between α (the fractional order), τ (the relaxing time) and ρ (the dynamic constant) can be set. Experimental results performed on a typical soft ferromagnetic (Fe-Si) validate the theory. Correct comparison simulations/measures are observed for both situations (weak and high amplitude excitation) conserving the same set of parameters (α, τ, ρ). The dynamic behavior of a ferromagnetic sample can be set under weak amplitude excitation using simple impedance LCR meter characterization and conserved for the simulation of high amplitude dynamic hysteresis cycles.

Published
2019

28. Reduce vector dynamic hysteresis model, for lump model applications or for integration in space discretized simulations

Author

Ducharne, Benjamin, Zhang, B, Deffo, Y, Sebald, G., Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Shandong University, University of Buéa, ELyTMaX, École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Tohoku University [Sendai]-Centre National de la Recherche Scientifique (CNRS)

Subjects
Vector hysteresis model, dry-friction equation, [SPI]Engineering Sciences [physics], fractional derivatives, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; Even if vector dynamic hysteresis models have been proposed and studied since many years, the so-called ideal model (accurate, fast, and based on less parameters and memory allocation …) is still missing. Even if progresses in computer science have allowed large improvement in the numerical simulation domain, high non-linearity property of vector dynamic hysteresis is still a challenge. In this article, we described a non-congruent vector dynamic hysteresis model based on a dry-friction type equation quasi-static contribution extended to the dynamic behavior using fractional derivatives. The model is fast, accurate and particularly well adapted to space discretized simulations.

Published
2019

29. Structural, dielectric, ferroelectric, and electrocaloric properties of 2% Gd2O3 doping (Na0.5Bi0.5)0.94Ba0.06TiO3 ceramics.

Author

Turki, O., Slimani, A., Seveyrat, L., Sebald, G., Perrin, V., Sassi, Z., Khemakhem, H., and Lebrun, L.

Subjects
SODIUM bisulfite, DIELECTRIC properties, FERROELECTRICITY, PYROELECTRICITY, HIGH temperatures, DOPING agents (Chemistry)
Abstract

Structural, dielectric, and ferroelectric properties, and electrocaloric effects of pure and Gd doped (Na0.5Bi0.5)0.94Ba0.06TiO3 ceramics prepared by the conventional solid-solid method have been carried out. The X-ray diffraction analysis confirms a pure perovskite structure with the coexistence of tetragonal and rhombohedra structures in both powders. The thermal and frequency dependences of the dielectric constants of both ceramics revealed relaxor behavior. The two compounds exhibited two phase transitions: ferroelectric/antiferroelectric (FE/AFE) transition followed by an antiferroelectric/paraelectric (AFE/PE) transition at higher temperatures. Remarkably, we noticed that the small amount of Gd doping (2%) highly enhanced the dielectric properties of the parent compound by about 71%. The phase diagram was as well influenced by the Gd doping, where the FE/AFE transition temperature rose from 90 in the parent compound to 115°C in the doped one whereas the AFE/PE transition temperature was decreased from 320 to 270°C, respectively. The direct electrocaloric measurements performed on both compounds showed that the ferroelectric/antiferroelectric phase transition was accompanied by a significant electrocaloric effect. The Gd3+ doping improved the electrocaloric properties of the parent compound, where a remarkable temperature variation of 1.4K was obtained in the doped ceramic. The results of the direct electrocaloric measurements will be compared and discussed with those derived from the indirect method. [ABSTRACT FROM AUTHOR]

Published
2016
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30. Polymer composites for magneto-mechanical energy conversion: experimental comparison of several magneto-rheological elastomers

Author

Sebald, G., Nakano, M., Mickael LALLART, Y Cavaille, G. Diguet And J., Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
[SPI]Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

33. Dynamics of magnetic field penetration into soft ferromagnets.

Author

Ducharne, B., Sebald, G., Guyomar, D., and Litak, G.

Subjects
*FERROMAGNETIC materials, *MAGNETIC fields, *EDDY currents (Electric), *MAGNETIC hysteresis, *MAGNETIC domain walls
Abstract

We propose an approach to solve the coupled problem of the magnetic field penetration into soft ferromagnets and a frequency dependent magnetic hysteresis. The magnetic field diffusion is related to the macroscopic eddy currents. The hysteresis model is related to the microscopic eddy currents derived from the magnetic domain wall movements, and is responsible for the frequency dependence of hysteresis loops. In this paper, based on a lumped model and fractional derivative operators, we demonstrate that it is possible to replace the coupled diffusion/dynamic hysteresis in a simplest formulation using fractional operators. Such a formulation can be solved easily. Instead of solving a 1D problem of diffusion, we show here that a lumped model with appropriate fractional time derivative operator can be an exact formulation of the problem. In addition, we confirm that the model is using experimental available information, obtained by standard single sheet tester measuring bench (the tangential surface excitation field, and the cross section average induction). [ABSTRACT FROM AUTHOR]

Published
2015
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34. Saturation of MR Elastomers impact in a pure sheared-based energy harvesting device

Author

Diguet, G., Sebald, G., Nakano, M., Mickael LALLART, Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
[SPI]Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

35. MR Elastomers for Energy Harvesting System

Author

Diguet, G., Sebald, G., Nakano, M., Mickael LALLART, ELyTMaX, École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Tohoku University [Sendai]-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
[SPI]Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

36. Modeling of Anisotropic Magneto-Rheological Elastomers for Mechanical to Electrical Energy Conversion

Author

Lallart Mickael, Sebald G., Diguet G., jean-yves CAVAILLE, Nakano M., Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
[SPI]Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

37. Experimental Testing of Pseudo-Villari Effect in Magnetorheological Elastomers

Author

Sebald, G., Nakano, M., Lallart, M., Tian, T., Diguet, G., jean-yves CAVAILLE, Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
[SPI]Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

39. Flexible two IC chipset for DVB on cable reception

Author

Haas, M., Kuttner, F., Kodytek, T., Kriedt, H., Krug, E., Meier, S., Mueller, K., Reventlow, C.v., Schmidmaier, R., Schoebinger, M., Sebald, G., Solanti, P., and Tiebout, M.

Subjects
Digital television -- Equipment and supplies, Digital video -- Equipment and supplies, Cable television -- Equipment and supplies, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

A DVB compliant chipset for QAM reception on cable was developed. It consists of two IC's, a down converter and an integrated QAM processor/FEC device including ADC, digital demodulation, equalization, clock and carrier recovery, and a forward error correction.

Published
1996

44. The use of fractional derivation in modeling ferroelectric dynamic hysteresis behavior over large frequency bandwidth.

Author

Guyomar, D., Ducharne, B., and Sebald, G.

Subjects
FERROELECTRICITY, HYSTERESIS, FRACTIONAL calculus, BANDWIDTHS, PHASE transitions, FERROMAGNETISM
Abstract

The present article proposes a dynamical model to obtain ferroelectric hysteresis dynamics based on fractional derivatives. The consideration of a fractional derivative term widely increases the frequency bandwidth of the accuracy of the traditional hysteresis models. As a consequence, the model is suited for successfully taking into account the well-known scaling relations of the ferroelectric hysteresis area, , versus the frequency, f, and field amplitude, E0. Under low frequency excitation, simulation tests provided good results regarding the comparison of the fractional model, experimental results and the well-known nonentire power law ∞f1/3E02/3 (where represents the hysteresis loop area). These results were followed by comparing the hysteresis area obtained from the fractional model with that from the well known scaling relations as f→∞, and the results were proposed as validation of the high frequency behavior. Next, the model was tested on large frequency bandwidths (>6 decades) and validated with success using the comparison between simulation tests and the only experimental results available in literature obtained in such conditions by Liu et al. [J. Phys.: Condens. Matter 16, 1189 (2004)] for BNT thin film samples. [ABSTRACT FROM AUTHOR]

Published
2010
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45. A model based on dry friction for modeling hysteresis in ferroelectric materials.

Author

Sebald, G., Boucher, F., and Guyomar, D.

Subjects
*FERROELECTRIC devices, *HYSTERESIS, *FERROMAGNETIC materials, *MAGNETIC domain, *ELASTICITY, *STRAINS & stresses (Mechanics), *PIEZOELECTRIC devices
Abstract

This paper presents a model describing the hysteresis in ferroelectric materials at moderate to high driving levels. Hysteresis and nonlinearities are attributed to the irreversible displacement of domain walls. The model, based on a simple mechanism related to the dry-friction concept, is developed to describe the hysteresis of polarization and strain under electric field and stress. Besides coefficients such as [variant_greek_epsilon]33 and d33 also exhibit large hysteresis loops under high electric and/or mechanic level. In this paper it is shown that modeling macroscopic quantities such as P or S hysteresis lead to a reasonable estimate of the coefficients since their behavior depends mainly on polarization. The proposed approach is developed, discussed, and compared with experimental results from Navy II piezoelectric transducer ceramic. Comparisons on hysteresis loops are given and are in good agreement for the polarization and strain versus electric field and, to a less extent, for the coefficients [variant_greek_epsilon]33 and d33. The linear and Rayleigh regime are deduced from the proposed approach. [ABSTRACT FROM AUTHOR]

Published
2004
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48. Epitaxial pyroelectric Pb(Zr,Ti)O3 thin films on silicon for thermal energy harvesting

Author

Rahma Moalla, Qiang Liu, Guillaume Saint-Girons, Bertrand Vilquin, Nicolas Baboux, Sebald, G., Catherine Dubourdieu, Bachelet, C., INL - Hétéroepitaxie et Nanostructures (INL - H&N), Institut des Nanotechnologies de Lyon (INL), Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-École Centrale de Lyon (ECL), Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE), Key laboratory of cryogenics, Chinese Academy of Sciences [Changchun Branch] (CAS), INL - Dispositifs Electroniques (INL - DE), Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), CSNSM SEMI, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI]Engineering Sciences [physics], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

11-15 mai 2015; International audience; no abstract

Published
2015

49. Thermal energy harvesting through epitaxial pyroelectric oxide films integrated on silicon

Author

Rahma Moalla, Qiang Liu, Vila-Fungueiriño, J., Adrien Carretero-Genevrier, Rivas-Murias, B., Rivadulla, F., Guillaume Saint-Girons, Bertrand Vilquin, Nicolas Baboux, Sebald, G., Catherine Dubourdieu, Romain Bachelet, INL - Hétéroepitaxie et Nanostructures (INL - H&N), Institut des Nanotechnologies de Lyon (INL), Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-École Centrale de Lyon (ECL), Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE), Key laboratory of cryogenics, Chinese Academy of Sciences [Changchun Branch] (CAS), INL - Dispositifs Electroniques (INL - DE), Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), and Inl, Laboratoire INL UMR5270

Subjects
[SPI]Engineering Sciences [physics], [SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic, [SPI] Engineering Sciences [physics], [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [SPI.MAT] Engineering Sciences [physics]/Materials, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

11-15 Mai 2015; International audience; no abstract

Published
2015

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