Stabilization effect in ferroelectric materials during aging in ferroelectric state

Abstract

We report that aging in ferroelectric state results in an increase of reverse transition temperature T f in both BaTiO 3 single crystal and Pb 0.84 La 0.16 Ti 0.96 O 3 polycrystal. This indicates that the ferroelectric phase is gradually stabilized during aging below Curie temperature. The evolution of the stabilization with aging time in these two different systems obeys the same kinetic function, but with different relaxation time. This indicates that the stabilization effect of the two systems stems from a common origin. We suggest that the stabilization is due to a short-range ordering of point defects, driven by a symmetry-conforming tendency of point defects.

Evolution of dielectric and ferroelectric relaxor states in Al3+-doped BaTiO3

“…Large dispersion in the dielectric curves during orthorhombic -tetragonal phase transition is therefore attributed to the differences in the rates of migration of oxygen vacancies to the O(1) site as required by the symmetry confirming principle of defects. [15][16][17][18][19][20][21] The volume effect in this case is also confirmed from the reduction of dielectric permittivity ( Fig. 1(c)).…”

Aging-induced double ferroelectric hysteresis loops in BiFeO3 multiferroic ceramic

“…8 Besides, the double P-E loops reported so far in BaTiO 3 -and ͑BiNa͒TiO 3 -based ceramics are at temperatures near T C-FE , 9,10 yet those found in aged doped BaTiO 3 / ͑BaSr͒TiO 3 crystals or ceramics are far below T C-FE . [11][12][13][14] These give essential evidences that aging may induce double P-E loops in BiFeO 3 at room temperature. In this letter, we explain the double P-E loops observed in the aged BiFeO 3 at room temperature according to a special aging effect adopted by Ren and co-workers.…”

“…In this letter, we explain the double P-E loops observed in the aged BiFeO 3 at room temperature according to a special aging effect adopted by Ren and co-workers. [11][12][13][14] A rapid liquid-phase sintering technique was used to prepare single-phase BiFeO 3 ceramic.…”

Aging and deaging effects in shape memory alloys

“…Furthermore, it should be noted that the higher aging temperature also gives rise to a larger change in the saturated value of the reverse transition temperature, which agrees with aging experiments on the physically similar ferroelectric materials. 35 As shown by the tilted free energy curves in Figs. 1(a2) and 1(a3), an increase of internal stress field ρ leads to deeper energy minima.…”