Anisotropic polar state of Sr0.75Ba0.25Nb2O6 single crystal

Lead‐Free Relaxor Ferroelectrics

“…231 Correspondingly, the formation of the low- temperature domain state as in Sr x Ba 1Àx Nb 2 O 6 is considered to be restricted. 263 On the contrary, qualitatively, the same relaxor behavior was found for the [001] and [100] directions of Sr 0.61 Ba 0.39 Nb 2 O 6 single crystals, (V. V. Shvartsman, unpublished data) as well as for the textured Sr 0.63 Ba 0.37 Nb 2 O 6 ceramics with the grains-oriented preferentially along and normal to the polar axis, respectively. 231 The linear shape of P(E) dependences as well as a presumable absence of PNRs seem to confirm this supposition.…”

“…Simon et al have reported that the Sr 0.75 Ba 0.25 Nb 2 O 6 single crystals behave like relaxors along the [001] direction, while exhibiting a ferroelectric transition in the [100] direction in the same temperature range. 263 On the contrary, qualitatively, the same relaxor behavior was found for the [001] and [100] directions of Sr 0.61 Ba 0.39 Nb 2 O 6 single crystals, (V. V. Shvartsman, unpublished data) as well as for the textured Sr 0.63 Ba 0.37 Nb 2 O 6 ceramics with the grains-oriented preferentially along and normal to the polar axis, respectively. 264 At the end of this section, we would like to point out that contrary to the lead-free perovskite relaxors, where B-site disorder is most important for inducing the relaxor behavior, the A-site disorder plays the crucial role in uniaxial TTB relaxors, in spite of the fact that the polar behavior in both cases is attributed to B-site cations.…”

Dielectric Relaxation Phenomena in SBN Single Crystals Doped with Ce

“…On the basis of the available structural [21] and dielectric data for related materials [22] one can suppose that the determined values of the relaxation time and the activation energy E a would be related to the collective oscillations of the short strong and long weak Nb-O bonds in the two different type corner-sharing NbO 6 octahedra aligned along c-axis.…”

Growth and Characterization of Centimeter‐Sized Ba2LaFeNb4O15 Crystals from High‐Temperature Solution under a Controlled Atmosphere

“…[47] Simon et al [48] showed that SBN crystals exhibit anisotropic dielectric behavior. They behave as relaxors along the [001] direction and as ferroelectrics along the [100] direction; such features are possibly related to the existence of structural modulations.…”