Relaxors are site‐ and charge‐disordered crystals or solid solutions where charge disorder induces random fields. They are characterized by the appearance of polar nanoclusters that are much smaller than typical ferroelectric domains, and a broad distribution of relaxation times. The various physical properties of relaxors are discussed and the spherical random‐bond–random‐field model of these systems is also presented. As the various polar units in nanoclusters vary in orientation and size the system cannot be described by an ordering field of fixed length as in Ising systems. The order parameter field is thus continuous. The phase diagrams, neutron scattering, Raman spectra, heat conductivity and specific heat as well as the NMR lineshapes and relaxation times are discussed. The existence of electric‐field‐induced critical end points in the phase diagrams is demonstrated and discussed within the Landau theory.
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