Crystal structure of the ‘mixed-layer’ Aurivillius phase Bi5TiNbWO15

Dielectric relaxations and electrical properties of Aurivillius Bi3.5La0.5Ti2Fe0.5Nb0.5O12 ceramics

“…Its unique crystal structure presents superior properties, renovates interest in the fundamental physics and chemistry of the Aurivillius compounds [3,4]. Meanwhile, these compounds exhibit promising technological applications in high temperature piezoelectric devices [5,6], non-volatile random access memory [7,8], and ionic conductors [9,10].…”

The kinetic effect on formation of disordered intergrowth structures in mixed bismuth-layered (Bi3NbTiO9)2(Bi4Ti3O12)1 compounds

“…The intergrowth bismuth-layered structures are one of the most important systems among these compounds, which are built up by the regular stacking of two different bismuth layered blocks (Bi 2 O 2 ) 2 þ (A mÀ 1 B m O 3m þ 1 ) 2À and (Bi 2 O 2 ) 2 þ (A nÀ 1 B n O 3n þ 1 ) 2À , always with n=mþ 1 and mainly with Bi to occupy A sites [6][7][8]. The values of m and n determine the numbers of perovskite layers within adjacent (Bi 2 O 2 ) 2 þ layers.…”

Two distinct dielectric relaxation mechanisms in the low-frequency range in Bi5TiNbWO15 ceramics

“…2-4 Moreover, the unique natural superlattice structures of this kind of compounds, implying other superior properties, renews interest in the fundamental solid-state chemistry and physics of the Aurivillius phases. 5,6 For example, the compound Bi 5 TiNbWO 15 , which is built up by a regular intergrowth of one-half the unit cell of Bi 2 WO 6 and one-half the unit cell of Bi 3 TiNbO 9 along the c axis, is not only a ferroelectric, but also a superior oxygen ion conductor, 7 and has potential applications in nonvolatile ferroelectric random memory ͑FeRAM͒, solid oxide full cells ͑SOFC͒, chemical sensors, etc.…”