Ferroelectricity in the x Ag2 Nb4 O11 - (1-x) Na 2 Nb4 O11 solid solution

Abstract

Compositions in the (Agx Na1-x)2 Nb 4 O11 solid solution have been prepared by a conventional solid state method. Composites containing Ag2 Nb4 O11 have been shown to be ferroelectric and the Curie temperature shown to decrease from 149°C at x=1 to 62°C at x=0.7. Room-temperature compositions with x0.7 are monoclinic, while those with x0.8 are rhombohedral with structures consistent with the relevant end members. At x=0.75, the structure was mainly rhombohedral but with coexistence of the monoclinic structure, indicating the proximity of a phase boundary. © 2011 American Institute of Physics.