Dielectric proprieties of ferroelectric ceramics derived from the system BaTiO3NaNbO3-based solid solutions |
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Authors: | Helmi Abdelkefi, Hamadi Khemakhem, Gabriel V lu, Jean Claude Carru,R gnault Von der Mü hll |
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Affiliation: | aLaboratoire de physique appliquée, ferroélectricité et conduction ionique 3018, BP 802 Sfax, Tunisia;bLaboratoire d'étude des matériaux et des composants pour l'électronique, 50, rue F. Buisson, BP 717, 62228 Calais, France;cInstitut de chimie de la matière condensée de Bordeaux, CNRS, 87, avenue du Dr. A. Schweitzer, 33608 Pessac, France |
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Abstract: | Dielectric studies performed on the solid solution Ba1−xNaxTi1−xNbxO3 (BNTN) show that all compositions (x= 0.1, 0.15, 0.2, 0.4, 0.5 and 0.025, 0.05, 0.6, 0.7, 0.8) exhibit a ferroelectric–paraelectric phase transition where the Curie temperature is a function of the composition. The specimens with composition BNTN (x= 0.05, 0.1, 0.15, 0.2) have been refined by the Celref method from X-ray powder diffraction data. The evolution of dielectric constant as a function of temperature and frequency in the range 77–500 K and 20–2 × 105 Hz, respectively, show that these ceramics present the classical ferroelectric character when 0x<0.075 and 0.55<x1 and relaxor character when 0.075x0.55. |
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Keywords: | Dielectric Ferroelectric Ceramics Relaxor behaviour Lead-free |
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