Evidence for a monoclinic distortion in the ferroelectric Aurivillius phase Bi3LaTi3O12

Composition dependence of the multifunctional properties of Nd-doped Bi4Ti3O12 ceramics

“…No evidence for ordering was observed, however, the Bi 3+ in the A site of the perovskite block tends to be preferentially substituted by Nd 3+ compared to the (Bi 2 O 2 ) 2+ rock-salt unit. A similar site preference for La 3+ has been reported before [53][54][55]. Deviations from the tetragonal symmetry are caused by displacements of the Bi 3+ /Nd 3+ with corresponding cooperative tilting and distortion of the TiO 6 octahedra in order to satisfy the bonding requirements at the four available cation sites.…”

Microstructural, structural and electrical properties of La3+-modified Bi4Ti3O12 ferroelectric ceramics

“…For a better comparison with the orthorhombic and monoclinic data, the estimated values of a TE from the BLT150 and BLT200 samples (that showed TE symmetry at room temperature) were converted into the equivalent a OR applying the relation a OR = √ 2a TE . 8 Keeping in mind that from the XRD results the solubility limit (x L ) of La 3+ into BIT falls below x = 2.0, Fig. 8 ratifies the observation finally deduced from the electrical results in the sense that x L should situate close to but slightly above x = 1.5.…”

“…Refs. [3][4][5][6][7][8][9] there appears to be no comprehensive work in which its main features, namely La 3+ -assisted sintering process and microstructure development, La 3+ tolerance, long-range order structural and electrical properties, have been all together collected and correlatively investigated. This is the purpose of the present work where the study of BLT ceramic materials has been reconsidered.…”

Structure versus relaxor properties in Aurivillius type compounds

“…In particular the [1 2 0] or [2 −1 0] zone axis patterns (ZAP) are sensitive to twinning and/or local disorder. 12,13 Examples of patterns of the relaxorlike compound Pb 2 Bi 4 Ti 5 O 18 are given in Fig. 3.…”