Relaxor characteristics of layered Ba1-(3/2)xLaxBi2Nb2O9 ceramics
| hal.structure.identifier | Materials Research Centre | |
| dc.contributor.author | KARTHIK, C. | |
| hal.structure.identifier | Materials Research Centre | |
| dc.contributor.author | VARMA, K. B. R. | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | MAGLIONE, Mario | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | ETOURNEAU, Jean | |
| dc.date.issued | 2007 | |
| dc.identifier.issn | 0021-8979 | |
| dc.description.abstractEn | Barium lanthanum bismuth niobate Ba1−(3/2)xLaxBi2Nb2 O9 (x = 0, 0.05, 0.1, and 0.15 ) powders havebeen prepared via solid state reaction route. The monophasic layered perovskite nature of eachcomposition of these was confirmed by x-ray diffraction studies. A continuous decrease in the latticeparameter c of parent BaBi2 Nb2 O 9 with increase in La3+ doping level was noteworthy. A decreasein dielectric constant maximum(E m), a shift in dielectric anomaly to lower temperatures (from488 to 382 K) , and an increase in the diffuseness (g) (from 1.58 to 1.84 ) of dielectric anomaly wereencountered on increasing x from 0 to 0.15. Vogel-Fulcher analyses showed a decrease in freezingtemperature (T f) (from 157 to 40 K) and an increase in the activation energy (0.53 to 1.12 eV ) forfrequency dispersion with increase in La3+ content. A downward shift in the peak position of thepyroelectric coefficient with increasing La3+ doping level was observed. The observed changes inthe above physical properties were attributed to the increase in A-site chemical heterogeneity as aresult of aliovalent La3+ doping on Ba2+ sites and associated A-site vacancy formation. | |
| dc.language.iso | en | |
| dc.publisher | American Institute of Physics | |
| dc.subject.en | Relaxor | |
| dc.subject.en | Ceramic | |
| dc.subject.en | Barium lanthanum bismuth niobate | |
| dc.subject.en | Dielectric constant | |
| dc.subject.en | Physical properties | |
| dc.title.en | Relaxor characteristics of layered Ba1-(3/2)xLaxBi2Nb2O9 ceramics | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1063/1.2392944 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Applied Physics | |
| bordeaux.page | 014106 (6 p.) | |
| bordeaux.volume | 101 | |
| bordeaux.issue | 1 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00131722 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00131722v1 | |
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