| Sumari: | Ceramic samples of polycomponent solid solutions (SSs) Na<sub>0.90</sub>K<sub>0.05</sub>Cd<sub>0.05</sub>NbO<sub>3</sub> (Cd-modified KNN) and [(Na<sub>0.90</sub>K<sub>0.05</sub>Cd<sub>0.05</sub>)<sub>0.95</sub>REE<sub>0.05</sub>]NbO<sub>3</sub>, where REE = La, Pr, Tb, Dy, Ho, were obtained by the uniaxial hot pressing (UHP) method. The crystal lattice structures, morphological features of the microstructure, and dielectric and thermophysical properties of these ceramics have been investigated. For the first time, their strength characteristics (Young’s modulus) and the critical stress intensity factor of the mode I K<sub>ic</sub> have been estimated. Photoluminescent properties have been compared in SSs [(Na<sub>0.90</sub>K<sub>0.05</sub>Cd<sub>0.05</sub>)<sub>0.95</sub>REE<sub>0.05</sub>]NbO<sub>3</sub> in the visible wavelength range.
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