Formation of the Structure and Piezoelectric and Dielectric Properties of NaNbO_3-KNbO_3-CuNb_2O_6 Solid Solutions

摘要

Ceramics of the 0.5NaNbO_3-(0.5-2x)KNbO_3-xCuNb_2O_6 system at x = 0-0.05 are produced via solid phase synthesis with subsequent sintering, according to the conventional technique. It is shown that introducing copper columbite into the (Na_(1-y), K_y)NbO_3 binary system does not result in structural phase transitions; rather, it leads to the formation of K_2Nb_4O_(11) impurity phase with the structure of tetragonal potassium tungsten bronze. A correlation between the dielectric properties of the investigated solid solutions and their quantity and the density of the samples is revealed.