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References in periodicals archive ?
Webber, "The antiferroelectric [left and arrow] ferroelectric phase transition in lead-containing and lead-free perovskite ceramics," Journal of the American Ceramic Society, vol.
Mittal, "Competing antiferroelectric and ferroelectric interactions in NaNb[O.sub.3]: neutron diffraction and theoretical studies," Physical Review B, vol.
A very possible scenario is that there are some polar domains/regions coexisting with the major nonpolar paraelectric phase in the crystal, and this may provide a structural basis for the apparent antiferroelectric behavior shown in the P-E and S-E hysteresis loops.
This explanation also gives a reason for observed ferroelectric disorder in NBT-12BT and may supply information about the origins of high electrostrictive response and antiferroelectric behaviour in NBT-BT.
Withers, "Composition-induced antiferroelectric phase and giant strain in lead-free ([Na.sub.y], [Bi.sub.z])[Ti.sub.1-x] [O.sub.3(1 - x)]-xBaTi[O.sub.3] ceramics," Physical Review B, vol.
BNT-BKT solid solutions are interesting because of three phenomena: (i) existence of two morphotropic boundaries, (ii) neighborhood of the antiferroelectric (AFE) phase of BNT and high-temperature ferroelectric (FE) phase of BNT, and (iii) complicated coexistence of several phases within one perovskite lattice because of the phase-transition diffusion.
It is found that BNTBT undergo a ferroelectric to antiferroelectric transition above a so-called depolarization temperature ([T.sub.d]) above which the piezoelectric properties deteriorate [14].
Among the polar ceramic materials are ferroelectric (FE) and antiferroelectric (AFE) particles, whose impact on dielectric properties and dispersion are still not well understood [9].
In general, two broad dielectric anomalies were obtained in BNT system, which is known to be [T.sub.d] and [T.sub.m] where "[T.sub.d]" referred as depolarization temperature, corresponding the transition from ferroelectric to antiferroelectric transition, and it can also be derived from the peak in the temperature dependence plot of tan [delta] [26], and "[T.sub.m]" referred as the temperature of maximum dielectric constant which corresponds to the transition from antiferroelectric to paraelectric phase transition.
These included ion pairing of aromatic ion radicals in solution, solvent effects on the ESR spectra of organic polar and nonpolar radicals, triplet exciton behaviour and order-disorder transitions in crystals of organic charge-transfer complexes of tetracyanobenzene, order-disorder transitions in hydrogen-bonded ferroelectrics and antiferroelectrics and various aspects of the ESR spectra of dilute magnetic semiconductors in crystalline and strained-layer forms.