Answers are grounded in this paper and cite their sources.
Peculiarities of phase transitions in disordered perovskite-like crystals—PbMg1/3 Nb2/3 O3 (PMN) and Na1/2 Bi1/2 TiO3 (NBT) have been studied by neutron scattering. The strong quasielastic scattering (QES) related to ferroelectric critical fluctuations has been observed instead of expected inelastic scattering of soft phonon mode. The wavevector dependence of this diffuse scattering has been well described by Ornstein-Zernice formula. The correlation length temperature dependence resembling that of spin-glasses has obtained. The history dependent effects have been found by measurements in electric field in “field cooled” (FC) and “zero field cooled” regimes. Those effects as well as long-time relaxation of Bragg peaks intensity, observed below certain temperature, clearly indicate glass-like nature of low-temperature phase.
No takes yet. Share an insight, caveat, or question.
Vakhrushev et al. (1989) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: