X-ray diffraction study of Ba0.985Na0.015Ti0.985Nb0.015O3, Ba0.6Na0.4Ti0.6Nb0.4O3 and Ba0.3Na0.7Ti0.3Nb0.7O3 compositions
| hal.structure.identifier | Laboratoire des Matériaux Ferroélectriques [LMF] | |
| dc.contributor.author | ABDELKEFI, Helmi | |
| 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 | DARRIET, Jacques | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | SIMON, Annie | |
| dc.date.issued | 2008 | |
| dc.identifier.issn | 0925-8388 | |
| dc.description.abstractEn | The Ba0.985Na0.015Ti0.985Nb0.015O3, Ba0.6Na0.4Ti0.6Nb0.4O3 and Ba0.3Na0.7Ti0.3Nb0.7O3 compositions of the (1 − x) BaTiO3–xNaNbO3 (BTNNx) system have been studied by X-ray diffraction and by measurements of dielectric properties. The specimens with composition BTNN (x = 0.015, 0.40 and 0.70) have been refined by the JANA program from X-ray powder diffraction data. Ceramic samples with composition (1 − x) BaTiO3 + xNaNbO3 (where x = 0.015, 0.40 and 0.70) were prepared by calcinations from appropriate mixture of BaCO3, TiO2, Na2CO3 and Nb2O5. The calcined powder was sintered at temperature range 1200–1400 °C. As the composition x increased from 0.015 (and 0.70), the ferroelectric ceramics (x = 0.015, FE) with tetragonal phase changed to the ferroelectric relaxors (RFE, x = 0.40). RFE ceramics showed a peculiar diffuse phase transition and dielectric relaxation at the low temperature (down to 180 K) due to a frustration between RFE and FE state. These ceramics present the classical ferroelectric character when 0 ≤ x < 0.075 and 0.55 < x ≤ 1 and relaxor character when 0.075 ≤ x ≤ 0.55. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | X-ray | |
| dc.subject.en | Dielectric | |
| dc.subject.en | Ferroelectric | |
| dc.subject.en | Ceramics | |
| dc.subject.en | Relaxor behaviour | |
| dc.subject.en | Lead-free | |
| dc.title.en | X-ray diffraction study of Ba0.985Na0.015Ti0.985Nb0.015O3, Ba0.6Na0.4Ti0.6Nb0.4O3 and Ba0.3Na0.7Ti0.3Nb0.7O3 compositions | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.jallcom.2007.09.031 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Alloys and Compounds | |
| bordeaux.page | 423-427 | |
| bordeaux.volume | 463 | |
| bordeaux.issue | 1-2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00319948 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00319948v1 | |
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