ELECTROPHYSICAL PROPERTIES OF SOLID SOLUTIONS NaNb1-xFexO3-δ (x=0;0,1;0,2)

Abstract

Introduction of dopants is a classic method for modifying properties of perovskite complex oxides of the family of general formula ABO3 . Sodium niobate NaNbO3 is widely used as a basis for creating solid solutions. The introduction of substitutional cations is carried out at both position A and at position B. Of particular interest is the case when valence of the dopant is greater or less than valence of the initial cation at the site. In this case, a defected structure is formed, which may have unique properties. This work is devoted to study of the electrical properties of sodium niobate ceramics doped with Fe3+. The substitution was carried out according to positions of the nibium cations Nb5+. It is shown that such compositions are characterized by a significant increase in electrical conductivity, a decrease in the Curie temperature, and a diffuse of the phase transition.

Keywords

• ionic conductivity
• cation vacancy
• ferroelectric solid solutions
• sodium niobate
• dielectric permittivity
• diffuse phase transition
• ferroelectric relaxors