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Your search keyword '"El Marssi, M."' showing total 381 results
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381 results on '"El Marssi, M."'

1. Conduction mechanism and switchable photovoltaic effect in (111) oriented BiFe$_{0.95}$Mn$_{0.05}$O$_{3}$ thin film

Author

Belhadi, Jamal, Ruvalcaba, J., Yousfi, S., El-Marssi, M., Córdova, T. Fraga, Matzen, S., Lecoeur, P., and Bouyanfif, H.

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

Epitaxial 200nm BiFe$_{0.95}$Mn$_{0.05}$O$_{3}$ (BFO) film was grown by pulsed laser deposition on (111) oriented SrTiO3 substrate buffered with a 50nm thick SrRuO$_{3}$ electrode. The BFO thin film shows a rhombohedral structure and a large remnant polarization of Pr = 104 $\mu$C/cm$^{2}$. By comparing I(V) characteristics with different conduction models we reveal the presence of both bulk limited Poole-Frenkel and Schottky interface mechanisms and each one dominates in a specific range of temperature. At room temperature and under 10mW laser illumination, the as grown BFO film presents short-circuit current density (Jsc) and open circuit voltage (Voc) of 2.25mA/cm$^{2}$ and -0.55V respectively. This PV effect can be switched by applying positive voltage pulses higher than the coercive field. For low temperatures a large Voc value of about -4.5V (-225kV/cm) is observed which suggests a bulk non-centrosymmetric origin of the PV response.

Published
2019
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35. Anti-polar state in BiFeO3/NdFeO3 superlattices.

Author

Khaled, M. A., Arnold, D. C., Dkhil, B., Jouiad, M., Hoummada, K., El Marssi, M., and Bouyanfif, H.

Subjects
SUPERLATTICES, ENERGY density, TRANSMISSION electron microscopy, ENERGY storage, X-ray diffraction
Abstract

Antiferroelectrics are promising materials for high energy density capacitors, and the search for environmentally friendly and efficient systems is actively pursued. An elegant strategy to create and design new (anti)ferroic system relies on the use of nanoscale superlattices. We report here the use of such a strategy and the fabrication of nanoscale BiFeO3/NdFeO3 superlattices and in depth characterization using high-resolution x-ray diffraction and transmission electron microscopy. The structural analysis at the atomic scale demonstrates that such superlattices host anti-polar ordering most likely described by an antiferroelectric-like Pbnm symmetry. Temperature dependence of the anti-polar state and structural transition further hint that the stability of the anti-polar state is controlled by the BiFeO3 layer thickness within the stacking and, in a more moderate way, by interlayer strain. Discovery of such a polar arrangement in superlattices and the possible generalization to the whole rare-earth family pave the way to new platforms for energy storage applications as well as nano-electronic devices. [ABSTRACT FROM AUTHOR]

Published
2021
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48. Electrocaloric response in lanthanum-modified lead zirconate titanate ceramics.

Author

Asbani, B., El Marssi, M., Dellis, J.-L., Lahmar, A., Gagou, Y., Mezzane, D., Amjoud, M., Alimoussa, A., Kutnjak, Z., Pirc, R., and Rožič, B.

Subjects
*LEAD zirconate titanate, *LEAD titanate, *LEAD oxides, *FERROELECTRIC materials, *CERAMICS, *ELECTRIC fields, *PHASE diagrams, *ENERGY consumption
Abstract

Recent findings of a large electrocaloric (EC) effect in polymeric and inorganic ferroelectric materials open a potential possibility of development of solid-state cooling or heating devices of new generation with better energy efficiency that may be less harmful for the environment. We investigate by using direct measurements, the temperature and electric field dependence of the electrocaloric response in Pb1-xLax(ZryTi1-y)1-x/4O3 bulk ceramics (PLZT) with x = 0.06 and 0.12. Here, the properties of the EC response were probed in a part of the PLZT composition phase diagram with low y = 0.40 composition, in which the EC effect was not previously studied. Measurement results show the existence of the sizeable EC response in the 12/40/60 PLZT sample with the EC temperature change (ΔTEC) of 2.92 K at 430 K and 80 kV/cm. This value exceeds previously obtained ΔTEC values in relaxor ferroelectric x/65/35 PLZT compositions, rivaling the best EC response in lead magnesium niobate-lead titanate ceramics. The electrocaloric responsivity (ΔT/ΔE) value of 0.41 × 10−6 Km/V determined at a lower electric field of 20 kV/cm and 410 K is comparable to those observed in other perovskite ferroelectrics. [ABSTRACT FROM AUTHOR]

Published
2020
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49. Dielectric and energy storage properties of Ba0.85Ca0.15Zr0.1Ti0.90O3 ceramics with BaO–Na2O–Nb2O5–WO3–P2O5 glass addition.

Author

Ihyadn, A., Merselmiz, S., Mezzane, D., Bih, L., Lahmar, A., Alimoussa, A., Amjoud, M., Luk’yanchuk, Igor A., and El Marssi, M.

Abstract

Lead-free Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) ceramic with different BaO–Na2O–Nb2O5–WO3–P2O5 (BNNWP) glass contents, forming (1–x)BCZT–xBNNWP lead-free ceramics (abbreviated as BCZTx; x = 0, 2, 4, 6, and 8wt%) were synthesized using the conventional solid-state processing route. The XRD investigation shows the coexistence of tetragonal and orthorhombic phases in BCZT pure. Likewise, only the tetragonal phase was detected in BCZTx (x = 2–8 wt%) ceramics. The SEM findings indicate that the average grain size decreases as the amount of BNNWP glass additives increases. In addition, BCZT ceramics modified with glass additions showed narrower hysteresis loops and a large electric field. The BCZT4 showed the highest recovered energy density of 0.52 J/cm3 at 135 kV/cm with an energy storage efficiency of 62.4%, which is increased by 6.6 compared to BCZT0 (0.075 J/cm3). The energy density was also calculated using the Landau–Ginzburg–Devonshire (LGD) theory. [ABSTRACT FROM AUTHOR]

Published
2023
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