The rhombohedral phase with incommensurate modulation in Na_1/2Bi_1/2TiO₃

The structural origin of the antiferroelectric properties and relaxor behavior of Na0.5Bi0.5TiO3

“…The periodicity of the modulation evolves with the temperature and becomes shorter at higher temperature. This evolution is in agreement with the results recently obtained in the same temperature range by Balagurov et al [9] using neutron diffraction. Above 290 1C, the stripes disappear and no particular contrast is observed in the image (Fig.…”

Lead-free and lead-basedABO3perovskite relaxors with mixed-valenceA-site andGe1, Devreugd2, Phelan3 et al. 2013Phys. Rev. B624490View full textAdd to dashboardCite

“…In fact, the measured Bragg peak intensity at (001) is almost certainly reduced by extinction effects, which are important for strong reflections in large single crystals such as ours; this suggests that the actual intensity discrepancy is even larger. We therefore confirm the average crystal structure of R3c, which is consistent with the neutron scattering study of Balagurov et al 56 We cannot, however, simply dismiss the weak peak near ( 1 2 1 2 1 2 ). Because it cannot be explained by double scattering, we believe it is real and has some other origin.…”

Electrocaloric effect and luminescence properties of lanthanide doped (Na1/2Bi1/2)TiO3 lead free materials

“…However, the AFE-like character in our RE doped NBT is observed at significantly lower temperatures indicating that the proximity of the morphotropic phase boundary (MPB). 5,31,32 The existence of the MPB could be the origin of such behavior, i.e., due to the electric field induced monoclinic phases similar to the behavior recently reported by Zhang et al 33 and Guo et al 34 for KNN-doped and NBT-BT ceramics near MPB. It should be noted that significant ECE was found in some antiferroelectric materials such as PbZrO 3 based materials.…”