Ferroelectric ceramic materials of the Aurivillius family

Abstract

Ferroelectric ceramics are important materials with a wide range of industrial and commercial applications. Since the discovery of the phenomenon of ferroelectricity, they have been the heart and soul of several multibillion dollar industries, ranging from highdielectric-permittivity capacitors to developments in piezoelectric transducers, pyroelectric sensors, medical diagnostic transducers, electro-optical devices, etc. Materials based on barium titanate and lead zirconate titanate have dominated the field throughout their history. Actually, the ferroelectric ceramics from the Aurivillius family receive great attention due to their large remanent polarization, lead-free nature, relatively low processing temperatures, high Curie temperatures and excellent piezoelectric properties, which made them good candidates for multiple applications. This review presents a general overview of the progress in the studies on the ferroelectric ceramics from the Aurivillius family. The progress includes several aspects: (i) structural studies, (ii) dielectric and electric behavior, (iii) piezoelectricity, and (iv) pyroelectricity.

Phase Transition Characteristics in A-Site La3+Modified Bi-Layered Aurivillius-Type Structure SrBi2Nb2O9Ferroelectric Ceramics

“…The obtained value of T m for the pure SBN sample is in agreement with that reported in the literature [16]. On the other hand, an anomalous behavior characterized by a continuous increase in the imaginary component of the dielectric permittivity was observed for temperatures higher than 450 • C. This behavior can be associated to the conductivity losses, which become prominent at low frequencies [17]. Table 2 shows the dielectric parameters obtained from the experimental results of Fig.…”

“…This behavior has been also attributed to the compositional fluctuation induced by La 3+ , partly in the perovskite blocks and partly in the in (Bi-2 O 2 ) 2+ layers [21]. In addition, the increase of both real and imaginary component of the dielectric permittivity for temperatures higher than 370 • C is also ascribed to the DC conductivity mechanisms in these samples [17]. The obtained results for the dielectric response confirm the previously discussed results for the Raman spectroscopy and ferroelectric hysteresis loops measurements and suggest an evolution from normal ferroelectric-paraelectric phase transition to a mixed diffuse ferroelectric-paraelectric phase transition and relaxor behavior with the increase of the lanthanum content.…”

Electrical studies on Zr-modified Bi3.25La0.75Ti3O12: a promising FRAM ceramic

“…This shows that the present materials have a higher electric conductivity as reported by Pel aiz-Barranco and Gonz alez-Abreu. [17] In addition to this, the lower concentration of Zr 4C in place of Ti 4C will also reduce the additional space charges; therefore, they exhibit large P r value, and clearly confirm that the oxygen vacancies are playing a predominant role in the fatigue property.…”

Polarization rotation in Bi4Ti3O12 by isovalent doping at the fluorite sublattice

“…The crystal structure of BiT has alternating FL (Bi2O2) 2+ and PL (Bin-1TinO3n+1) 2sub-layers stacked along the c-axis with the number of perovskite-like layers, n = 3. The Curie temperature of BiT is measured as TC = 675 °C [2]. The ferroelectric B1a1 structure transforms to a paraelectric tetragonal crystal structure above TC with space group I4/mmm.…”