C. Heremans et Hl. Tuller, Field-induced antiferroelectric-ferroelectric phase transitions in the Pb0.98La0.02(Zr0.70Hf0.30)(1-x)TixO3 system, J APPL PHYS, 87(3), 2000, pp. 1458-1466
Field-induced phase transitions of antiferroelectric-ferroelectric nature h
ave been investigated in the Pb0.98La0.02(Zr0.70Hf0.30)(1-x)TixO3 system. S
amples of compositions 0.065 less than or equal to x less than or equal to
0.10, located in the vicinity of an antiferroelectric-ferroelectric phase b
oundary, were analyzed by x-ray diffraction, by dielectric, and by electro-
mechanical measurements. Samples with x less than or equal to 0.095 exhibit
ed a metrically tetragonal structure, whereas the sample with x = 0.1 exhib
ited a rhombohedral structure. From the electromechanical measurements, the
compositions deepest in the antiferroelectric phase field (x less than or
equal to 0.075), were initially located in the antiferroelectric phase fiel
d (AFE(I)). The samples showed a pure electrostrictive behavior at low elec
tric fields but underwent a phase transition into another antiferroelectric
phase AFE(II) when submitted to higher electric fields. For intermediate c
ompositions with 0.0775 less than or equal to x less than or equal to 0.095
, the electric field enforced a transition between the antiferroelectric AF
E(II) phase and the ferroelectric phase. In the latter compositional range,
remanent ferroelectric behavior was detected at zero field and increased w
ith Ti content until the ferroelectric phase remained metastable, in analog
y with the better studied PbNbZrSnTiO3 and PbLaZrSnTiO3 systems. (C) 2000 A
merican Institute of Physics. [S0021-8979(00)08003-8].