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- W968353546 abstract "Ferroelectricity in Aurivillius type structure ceramics based on the composition Bi 2 SrNb 2 O 9 with cationic isomorphic substitutions in both the (Bi 2 O 2 ) 2+ and the perovskite layers, Bi 2-x Te x Sr 1-x Na(K) x Nb 2 O 9 , has been obtained. Dielectric measurements as a function of the temperature show a first peak in the dielectric constant that would correspond to a ferroparaelectric phase transition which temperature increases when the ionic radius size of the Sr substitution decreases, and a higher temperature second peak which behaviour could correspond to a relaxor ferroelectric. The results of measurements of remanent polarization as a function of the temperature seem to confirm this assumption because the polarization disappears at temperatures that lay between those of the dielectric peaks. Well saturated hysteresis loops were obtained for the three substituted samples at temperatures above 200°C. The a.c. electric conductivity shows anomalies at temperatures closer to those of the remanent polarization disappearance. From d.c. electric conductivity, and frequency of the imaginary parts of the impedance and the dielectric modulus maxima as a function of the temperature data, activation energies are obtained that could correspond to thermally activated oxygen vacancies." @default.
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- W968353546 date "1998-06-01" @default.
- W968353546 modified "2023-10-06" @default.
- W968353546 title "Ferroelectricidad en compuestos con estructura de capas tipo aurivillius y sustituciones catiónicas en sitios del Bi/Sr" @default.
- W968353546 hasPublicationYear "1998" @default.
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