KARTHIK, C.; VARMA, K. B. R.; MAGLIONE, Mario; ETOURNEAU, Jean

doi:10.1063/1.2392944

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KARTHIK, C.
Materials Research Centre

VARMA, K. B. R.
Materials Research Centre

MAGLIONE, Mario
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Applied Physics. 2007, vol. 101, n° 1, p. 014106 (6 p.)

American Institute of Physics

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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.< Leer menos

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Relaxor

Ceramic

Barium lanthanum bismuth niobate

Dielectric constant

Physical properties

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Relaxor characteristics of layered Ba1-(3/2)xLaxBi2Nb2O9 ceramics

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