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Artykuły w czasopismach na temat "Relaxeur ferroélectrique"
Ravez, J., i A. Simon. "Le premier relaxeur ferroélectrique oxyfluoré". physica status solidi (a) 159, nr 2 (luty 1997): 517–22. http://dx.doi.org/10.1002/1521-396x(199702)159:2<517::aid-pssa517>3.0.co;2-o.
Pełny tekst źródłaRavez, Jean, i Annie Simon. "Ferroélectriques classiques ou relaxeurs dérivés de BaTiO3". Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 325, nr 8 (październik 1997): 481–86. http://dx.doi.org/10.1016/s1251-8069(97)89450-x.
Pełny tekst źródłaPapet, P. "Effets de la taille des grains sur les propriétés diélectriques du relaxateur ferroélectrique Pb(Mg1/3Nb2/3)O3". Journal de Physique III 4, nr 7 (lipiec 1994): 1189–96. http://dx.doi.org/10.1051/jp3:1994194.
Pełny tekst źródłaRozprawy doktorskie na temat "Relaxeur ferroélectrique"
Laulhé, Claire. "Structure locale dans un ferroélectrique relaxeur : BaTi(1-x)Zr(x)O3". Phd thesis, Grenoble INPG, 2007. http://tel.archives-ouvertes.fr/tel-00196922.
Pełny tekst źródłaTellier, Jenny. "Sur les phases d'Aurivillius : études structurales et transitions de phases". Limoges, 2006. https://aurore.unilim.fr/theses/nxfile/default/dd157e3d-cbb2-4ec9-95b3-2e5100ed9b30/blobholder:0/2006LIMO0019.pdf.
Pełny tekst źródłaAurivillius phases, with general formula (Bi2O2)2+(Am-1BmO3m+l)2- can be ferroelectric or relaxor materials. They display orthorhombic symmetry at room temperature and tetragonal at high temperature. Structural study of ferroelectric and relaxor compounds at room temperature show that relaxors' structure is legs distorted than that of ferroelectrics. Their fluorite slabs are independent and contain non-bismuth cations. Disorder in relax ors is showed using TEM analysis. It leads to local variations of structure which can be responsible for relaxor behaviour. Phase transition study cannot be carried out systematically for such compounds. The case of SrBi2Ta2O9, SrBi2Nb2O9 and Bi4Ti2,8Cr0,2O12 is considered, and additional information is given about other Aurivillius phases
Hentati, Mouhamed Amin. "Effets des inhomogénéités locales et des contraintes extérieures sur les propriétés diélectriques et structurales des monocristaux PZN-x%PT". Phd thesis, Châtenay-Malabry, Ecole centrale de Paris, 2013. http://tel.archives-ouvertes.fr/tel-01003354.
Pełny tekst źródłaAYDI, Abdelhedi. "Elaboration et caractérisations diélectriques de céramiques ferroélectriques et/ou relaxeur de formule MSnO3-NaNbO3(M=Ba,Ca)". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2005. http://tel.archives-ouvertes.fr/tel-00009068.
Pełny tekst źródłaGuerville, François de. "Films minces et superréseaux à base du ferroélectrique BaTiO3 et du relaxeur BaTi0,68Zr0,32O3 : élaboration, études par diffraction de rayons X et par spectroscopie Raman : modélisation des domaines ferroélectriques dans les films minces et les superréseaux". Amiens, 2008. http://www.theses.fr/2008AMIE0113.
Pełny tekst źródłaThis work deals with lead-free ferroelectric oxide thin films and superlattices, studied both experimentally (elaboration/characterization) and by modelling. In the experimental part, we have elaborated thin films and superlattices based on ferroelectric BaTiO3 and relaxor BaTi0. 68Zr0. 32O3 by pulsed laser deposition on MgO substrate buffered by La0. 5Sr0. 5CoO3. These samples were then studied by X ray diffraction and Raman spectroscopy in order to determine their structure, to estimate the stress therein and to evidence structural phase transitions. In superlattice, BaTiO3 layers show a quadratic ferroelectric structure with a1/a2 domains whereas BaTi0. 68Zr0. 32O3 layers are perpendicularly deformed to substrate plane. Dislocations appearance beyond a 260 Å critical period seems to relax these stresses. Against all expectations, superlattices Raman spectra have thinner lines than in films. We have attributed this phenomenon to a Ti4+ ion disorder decrease on the BaTiO3 perovskite structure B site. Temperature studies seem to show phase transition absence for BaTiO3 layers in superlattice. In addition, we have simulated thermodynamic and electric behaviour of ferroelectric domains in thin film and in ferroelectric/paraelectric superlattice. For this, we have modelled polarization profile taking into account finite size and interface effects, from 0 Kelvin to beyond phase transition temperature. We have shown nanometric thickness films properties are substantially modified by gradual polarization profile in these domains ; dielectric constant temperature evolution suits experimental behaviour observed around phase transition
Bouyanfif, Houssny. "Hétérostructures et super-réseaux à base du relaxeur PbMg1/3Nb2/3O3 et du ferroélectrique PbTiO3@ : croissance et étude des effets de contraintes par diffraction de rayons X et spectroscopie Raman". Amiens, 2005. http://www.theses.fr/2005AMIE0502.
Pełny tekst źródłaHornebecq, Virginie. "Nouveaux tantalates ferroélectriques de type bronze quadratique de tungstène : de la structure aux propriétés physiques". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2000. http://tel.archives-ouvertes.fr/tel-00003498.
Pełny tekst źródłaBenyoussef, Manal. "Experimental and theoretical investigation of rare-earth doped lead-free relaxor ferroelectric Na0.5Bi0.5TiO3 system for high-temperature energy storage capacitors". Electronic Thesis or Diss., Amiens, 2020. http://www.theses.fr/2020AMIE0053.
Pełny tekst źródłaIn the present research work, we performed a comprehensive experimental and theoretical investigation on the lead-free relaxor ferroelectric Na0.5(Bi1-xREx)0.5TiO3 (xRENBT) systems (RE = rare earth) for high-temperature energy storage capacitors. The conventional solid-state method was used to synthesize the xRENBT (RE = Dy, and Nd) ceramics with different concentration levels. A Pure perovskite phase and dense microstructure were revealed through XRD and SEM investigations. Besides, a great structural diversity was found in the xRENBT systems and was observed to depend on the nature and level of the doped rare earth element. Temperature-dependent dielectric investigations revealed very low dielectric losses in the doped compounds, especially at high temperatures. High stability of the temperature coefficient of the capacitance (TCC) was obtained for the doped samples. Through the ferroelectric investigations, we observed that rare earth doping was found to break the long-range ferroelectric domains and instead induce polar nano regions within the studied systems. Accordingly, high energy storage properties were obtained with values reaching Wrec = 1.2 J/cm3 (η = 60%) at 95 kV/cm, with great temperature stability (120 – 200°C). Besides, the RE induced local structural heterogeneities within the NBT system, was found effective in improving the electrocaloric effect of the doped compositions in a broad temperature range, with an electrocaloric coefficient reaching high values of ΔT/ΔE ~ 0.30×10-6 K m/V. The effect of rare-earth doping on the structural, ferroelectric, electronic, and magnetic properties of the Na0.5(Bi3/4RE1/4)0.5TiO3 (RE = Nd, Gd, Dy, and Ho) system was thoroughly investigated using the FPLAPW based on the spin-polarized density functional theory implemented in the WIEN2k code. The mechanism driving ferroelectricity and the effect of doping on the relaxor properties of the system were thoroughly investigated. A modified Heisenberg model was used to simulate the phase transition and temperature-dependent hysteresis loops of the rare-earth-doped NBT system. The obtained results evidenced that tuning the polar domains in lead-free relaxor ferroelectrics is a powerful way to design materials with enhanced dielectric stability, energy storage, and electrocaloric properties over a broad temperature range
Albino, Marjorie. "Synthèse et caractérisation structurale et diélectrique de céramiques et de monocristaux relaxeurs de structure TTB". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00920357.
Pełny tekst źródłaLebon, Alexandre. "Influence de la direction de polarisation sur la coexistence de phases et la structure en domaines du ferroélectrique - relaxeur Pb(Zn1/3Nb2/3)O3 : une étude sur monocristal par diffraction des rayons X et diffusion Raman". Châtenay-Malabry, Ecole centrale de Paris, 2001. http://www.theses.fr/2001ECAP0707.
Pełny tekst źródłaPb(Zn1l3Nb2/3)03 (PZN) is a complex lead based perovskite. This ferroelectric relaxor exhibits remarkable electromechanical properties that make necessary a study as a function of the direction of polarisation. In fact, even though the spontaneous polarisation is parallel to a <111> direction, its piezoelectric properties are optimised when the crystal is polarised along [001]. Spontaneously, the cubic → rhombohedral phase transition that occurs at Tc = 385 ± 5 K is diffuse in temperature. Rhombohedral microdomains appear within the cubic phase, as their number increases, they occupy all the crystal around 330 K. Below Tc, the application of an electric field along [111] induces a complex structure of rhombohedral macrodomains. These macrodomains of a few tens of microns are separated by regions that diffuse light and that belongs to {11O} plans. As the [001] direction of the applied electric field is concerned, a Monoclinic tetragonal phase coexistence is induced. In a field cooling process, a structure of 4 monoclinic microdomains is ordered symmetrically with respect to the direction of the electric field. All , our data enabled to build an electric field - temperature diagram (E-T) along [001]. At last, on the basis of structural data, a tetragonal symmetry is proposed for the nanopolar regions that give way to dielectric relaxation