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Compositions in the (AgxNa1−x)2Nb4O11 solid solution have been prepared by a conventional solid state method. Composites containing Ag2Nb4O11 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 x≤0.7 are monoclinic, while those with x≥0.8 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.

Ferroelectricity in the xAg2Nb4O11–(1−x)Na2Nb4O11 solid solution