Untitled
| hal.structure.identifier | Laboratoire des Matériaux Ferroélectriques [LMF] | |
| dc.contributor.author | CHAKER, Chiheb | |
| hal.structure.identifier | Laboratoire des Matériaux Ferroélectriques [LMF] | |
| dc.contributor.author | EL GHARBI, Walid | |
| hal.structure.identifier | Laboratoire des Matériaux Ferroélectriques [LMF] | |
| dc.contributor.author | ABDELMOULA, Najmeddine | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | SIMON, Annie | |
| hal.structure.identifier | Laboratoire des Matériaux Ferroélectriques [LMF] | |
| dc.contributor.author | KHEMAKHEM, Hamadi | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | MAGLIONE, Mario | |
| dc.date.issued | 2011 | |
| dc.identifier.issn | 0022-3697 | |
| dc.description.abstractEn | Na<sub>1−<i>x</i></sub>Li<sub><i>x</i></sub>NbO<sub>3</sub> ceramics with composition 0.05≤<i>x</i>≤0.30 were prepared by solid-state reaction method and sintered in the temperature range 1100-1150 °C. These ceramics were characterised by X-ray diffraction as well as dielectric permittivity measurements and Raman spectroscopy. Dielectric properties of ceramics belonging to the whole composition domain were investigated in a broad range of temperatures from 300 to 750 K and frequencies from 0.1 to 200 kHz. The Rietveld refinement powder X-ray diffraction analysis showed that these ceramics have a single phase of perovskite structure with orthorhombic symmetry for <i>x</i>≤0.15 and two phases coexistence of rhombohedral and orthorhombic above <i>x</i>=0.20. The evolution of the permittivity as a function of temperature and frequency showed that these ceramics Na<sub>1−<i>x</i></sub>Li<sub><i>x</i></sub>NbO<sub>3</sub> with composition 0.05≤<i>x</i>≤0.15 present the classical ferroelectric character and the phase transition temperature <i>T</i><sub>C</sub> increases as <i>x</i> content increases. The polarisation state was checked by pyroelectric and piezoelectric measurements. For <i>x</i>=0.05, the piezoelectric coefficient <i>d</i><sub>31</sub> is of 2pC/N. The evolution of the Raman spectra was studied as a function of temperatures and compositions. The results of the Raman spectroscopy study confirm our dielectric measurements, and they indicate clearly the transition from the polar ferroelectric phase to the non-polar paraelectric one. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Ceramics | |
| dc.subject.en | X-ray diffraction | |
| dc.subject.en | Raman spectroscopy | |
| dc.subject.en | Ferroelectricity | |
| dc.subject.en | Phase transitions | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.jpcs.2011.07.002 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Physics and Chemistry of Solids | |
| bordeaux.page | 1140-1146 | |
| bordeaux.volume | 72 | |
| bordeaux.issue | 10 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00617183 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00617183v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Physics%20and%20Chemistry%20of%20Solids&rft.date=2011&rft.volume=72&rft.issue=10&rft.spage=1140-1146&rft.epage=1140-1146&rft.eissn=0022-3697&rft.issn=0022-3697&rft.au=CHAKER,%20Chiheb&EL%20GHARBI,%20Walid&ABDELMOULA,%20Najmeddine&SIMON,%20Annie&KHEMAKHEM,%20Hamadi&rft.genre=article |
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