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The investigation results of the processes of phase formation in barium niobate, strontium, and their solid solutions in the conditions of the variability of the thermodynamic background are presented. The formation of a grain landscape and dielectric properties (including relaxation phenomena) in the solid solutions of strontium niobate and their solid solutions and the establishment of regularities in the formation of radio-absorbing properties in them are studied. [ABSTRACT FROM AUTHOR]

In flux-grown (1-x)NaNbO3-(x)Gd⅓NbO3 solid solution crystals a diffusion of the dielectric permittivity ε maximum grows with x and increases dramatically when x exceeds a threshold value x0 ≈ 0.1. Optical studies by the rotating-polarizer method show that Gd-doping results in a very small mean size of twins and the distribution of the birefringence image becomes very messy. In the x < x0 range the changes of lattice parameters and birefringence corresponding to the ε(T) anomaly were revealed. The results obtained are in line with the assumption that phase transition diffusion in NaNbO3 is a result of the local strains stemmed from the impurities. [ABSTRACT FROM AUTHOR]

Deals with a study which determined the properties of nonstoichiometric sodium niobate. Background to the study; Analysis of the X-ray diffraction data; Conclusions.