Structural transition on W(100)

Ferroic transitions in the multiferroic (1 −x)Pb(Fe1/2Nb1/2)O3–xPbTiO3 system and its phase diagram

“…A similar type of weak dielectric anomaly below the main Curie point transition has been reported for poled ceramics and single crystals of PMN-xPT by different workers [45][46][47][48][49][50]. Until recently, there has been considerable controversy about the origin of this weak anomaly.…”

“…Until recently, there has been considerable controversy about the origin of this weak anomaly. Different explanations based on depoling [47], Vogel-Fulcher freezing [49] and rhombohedral to tetragonal phase transition [45,46,50] have been advanced in the literature to explain the origin of this weak anomaly in e 0 (T). Recently two dielectric anomalies have also been reported in unpoled ceramic samples of PMN-xPT by Singh et al [37].…”

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

“…This is consistent with numerous data showing that unpoled PMN-xPT crystals from the MPB compositional range exhibit a relaxorlike behavior, while, at high fields, their properties are similar to ordinary ferroelectrics. 8,9 The new result is that there exists a threshold dc bias value below which the behavior of the crystals is relaxor like, while, above this threshold, it is more or less similar to usual ferroelectrics. The Almeida-Thouless line plotted by using the polarization hysteresis curves 3 lies at higher fields.…”

“…[1][2][3][4][5][6][7][8][9][10] Besides, they serve as model objects for studying relaxor properties. Relaxors represent a class of disordered crystals exhibiting a broad and frequency-dependent temperature maximum of the dielectric permittivity versus temperature instead of a sharp maximum inherent to normal ferroelectrics.…”

“…It is well documented that, 5,[8][9][10] for PMN-xPT compositions within the morphotropic phase boundary ͑MPB͒ range, the temperature T m of the permittivity maximum increases with dc bias field E and the rate of this increase depends on the crystal orientation. Contrary to this, Viehland et al 16 showed that, in PMN-0.1PT ceramics, T m slightly decreases under small fields and strongly increases only at large fields.…”