Abstract

Phase transition in the (1− x) PbTiO 3- xA( B 2 3 Nb 1 3 ) O 3 ( A= La, Bi; B= Zn,Mg) solid solution systems has been investigated by means of x-ray diffraction, dilatometric and dielectric measurements. Complete solid solutions with a perovskite structure are formed in the ranges of 0 < x < 0.7 and 0 < x < 0.3 for the PbTiO 3- La( B 2 3 Nb 1 3 ) O 3 and PbTiO 3- Bi( B 2 3 Nb 1 3 ) O 3 systems, respectively. The tetragonal distortion at room temperature decreases with increasing the La( B 2 3 Nb 1 3 ) O 3 or Bi( Mg 2 3 Nb 1 3 ) O 3 molar fraction, while it increases with the Bi( Zn 2 3 Nb 1 3 ) O 3 content. The ferroelectric Curie temperature determined by the dielectric and/or dilatometric measurements decreases rapidly with the increase of the La( B 2 3 Nb 1 3 ) O 3 content, but slightly decreases or increases with Bi compounds in the case of the Bi( Mg 2 3 Nb 1 3 ) O 3 or Bi( Zn 2 3 Nb 1 3 ) O 3 series, respectively.

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