caa a22 4500 38802058X CHVBK 20180307124923.0 cr unu---uuuuu 161130e199809 xx s 000 0 eng 10.1557/JMR.1998.0358 doi S0884291400045945 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0358 Influence of Bi-site Substitution on the Ferroelectricity of the Aurivillius Compound Bi2SrNb2O9 [Elektronische Daten] Ceramics based on the composition Bi2SrNb2O9 with isomorphic substitutions of cations in the Bi2O22+ and the perovskite layers, Bi2−xTexSr1−xNa(K)xNb2O9, have been prepared by solid state reaction. The ferroelectricity of this Aurivillius type structure has been studied. Dielectric measurements as a function of the temperature show a low temperature maximum in the dielectric constant that would correspond to a ferro-;paraelectric phase transition. The temperature of this maximum increases when the radius of the ion that substitutes Sr for decreases. A second maximum in the dielectric constant is found at higher temperature possibly corresponding to a relaxor ferroelectric. Measurements of remanent polarization as a function of the temperature seem to confirm the relaxor behavior, because the polarization disappears at temperatures between the two maxima of the dielectric constant. Saturated hysteresis loops are obtained for all the substituted samples at temperatures above 300 °C. Ferroelectric parameters such as the polarization, coercive field, and coupling factors of the BSN family compounds were obtained for the first time. The ac electric conductivity shows anomalies at temperatures close to those where the remanent polarization disappears. Activation energies calculated from measurements of dc electric conductivity, impedance arcs, and dielectric modulus data may be associated with thermally activated oxygen vacancies. Copyright © Materials Research Society 1998 Durán-Martín- P. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain Castro A. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain Millán P. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain Jiménez B. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain Journal of Materials Research Cambridge University Press 13/9(1998-09), 2565-2571 0884-2914 13:9<2565 1998 13 JMR https://doi.org/10.1557/JMR.1998.0358 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0358 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Durán-Martín- P. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain NATIONALLICENCE 700 1- Castro A. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain NATIONALLICENCE 700 1- Millán P. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain NATIONALLICENCE 700 1- Jiménez B. Instituto de Ciencia de Materiales, CSIC. Cantoblanco. 28049-Madrid, Spain NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/9(1998-09), 2565-2571 0884-2914 13:9<2565 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge