The importance of quenched dipolar and quadrupolar fields in disordered dipolar systems with effective ferroelectric interaction is reviewed. Stable or metastable domain states appear e.g. in K1 - xLixTaO3 (x = 0.063), KTa1 - xNbxO3 (x = 0.017) and PbMg1/3Nb2/3O3. Occasionally, unsmearing of the ferroelectric phase transition is possible by application of an electric field. Spontaneous relaxation towards quadrupolar long-range order is observed in KTa1 - xNbxO3, x = 0.017. In the low-x limit both ferroelectricity and random-field interactions become irrelevant in comparison with the random and frustrated interactions. They give rise to an Ising-type dipole glass transition in K1 - xLixTaO3, x = 0.011.
Ferroelectrics
Volume 150, 1993 - Issue 1
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