Ln: Pr, Nd, Gd, Dy). -The title compounds are prepared by solid state reaction of mixtures of Bi2O3, TiO2, and Nd2O3, Pr6O11, Gd2O3, or Dy2O3 (900°C, 19 h). The samples are characterized by powder XRD, SEM, and impedance spectroscopy. They exhibit layered orthorhombic structures. The conductivity diminishes as the size of Ln increases. The rare earth concentration determines the ferroelectric characteristics of the compounds: for small x values they behave as typical ferroelectrics, but all of them tend to become relaxors with increasing x. -(PINEDA-FLORES*, J. L.; CHAVIRA, E.; REYES-GASGA, J.; GONZALEZ, A. M.; HUANOSTA-TERA, A.; J. Eur.
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