Electric-field–temperature phase diagram of the ferroelectric relaxor system (1 − x)Bi1/2Na1/2TiO3 − xBaTiO3 doped with manganese

Abstract

Articles you may be interested inLarge strain response based on relaxor-antiferroelectric coherence in Bi0.5Na0.5TiO3-SrTiO3-(K0.5Na0.5)NbO3 solid solutions Structural stability and depolarization of manganese-doped (Bi0.5Na0.5)1− x Ba x TiO3 relaxor ferroelectrics J. Appl. Phys. 116, 154101 (2014); 10.1063/1.4898322Electromechanical strain and bipolar fatigue inThe electric-field-temperature phase diagram for the lead-free relaxor material (1 À x)(Bi 1/2 Na 1/2 ) TiO 3 À xBaTiO 3 (x ¼ 0.03, 0.06, and 0.09) doped with 0.5 mol% Mn (BNT-100xBT:Mn) was established. Transition lines between ergodic or nonergodic relaxor states and the field-induced ferroelectric state were determined at constant temperatures with electric-field-dependent measurements of the polarization as well as of the piezoelectric coefficient and permittivity. Near the depolarization temperature T d , the switching between two ferroelectric poling directions occurs in two steps via an intermediate relaxor state. This effect is closely related to the pinching of the ferroelectric hysteresis loop. V C 2014 AIP Publishing LLC. [http://dx.

Stress-modulated relaxor-to-ferroelectric transition in lead-free(Na1/2Bi1/2Schader1, Wang2, Hinterstein3 et al. 2016Phys. Rev. B885462View full textAdd to dashboardCite

“…6. The stress-temperature phase diagram has the same form as previous electric-field-temperature phase diagrams presented for Mn-doped NBT-0.06BT [48] further indicating the parallels of electrical and mechanically modulated RE-FE transitions in relaxor ferroelectrics.…”

“…E-T phase diagrams have been previously presented for Pb 1-x [47], and Mn-doped NBTxBT [48], giving considerable insight into the role of external electric fields on the stability of the relaxor states. Besides the effect of an electric field, Samara reported the influence of hydrostatic mechanical pressure on the phase transition behavior of a relaxor material [49].…”

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

“…The negligible − and − at 110 °C suggest that the applied electric field is not high enough to induced a long-range ferroelectric order at this temperature, indicating that the thermal energy is too high. The electric field induced phase transition and its reversibility depicted in the bias-field-dependent small signal properties are consistent with results in other BNT-based materials 121,149 and the diffraction studies from this work (Section 5.2.2). The magnitude of 33 , ( 33 ), and 33 vary with temperature, as displayed in Figure 5.44 (a).…”

“…448 Investigations on the BNT-0.25ST were performed for both the long and mesoscopic length scales, as will be treated in the next paragraphs. 121,149 and may be ascribed to a maximization of the reversible switching processes prior to the destabilization of the ferroelectric state, similar to what was found near the line of critical points of BZT-BCT ( Figure 5.22 (c)). The non-negligible indicates a varying distribution of ergodicity, as previously reported in other materials.…”

“…148 Both processes lead to maximized 33 values (i.e., 33 ) and a maximized 33 3 = − . 121,149 Therefore, the inflection point of the strain curves indicate the electric field required to trigger the phase transition from the relaxor to the ferroelectric state at − . An electric field hysteresis ∆ − is observed when the development and decay processes are compared.…”