Abstract
Ceramics of Ag1−xBix∕3NbO3 (x<0.6) perovskite solid solutions were obtained by solid-state reaction. The tilting systems (a−a−c+ for x=0.1–0.3 and a0a0c+ for x=0.4–0.5) were determined from the splitting of the peaks and the superlattice lines in the x-ray diffraction patterns. The dielectric properties of the Ag1−xBix∕3NbO3 (x=0.1–0.6) ceramics were measured in the range of 100–870K at 1kHz–1MHz. Based on the dielectric measurements, three phase transitions occurred for x=0.1–0.3, and their temperatures decreased with the increasing Bi content. A new diffuse phase transition occurred for x>0.3. A T-x phase diagram was constructed from the dielectric data. Excellent temperature-stable dielectrics were obtained at x=0.25 in the vicinity of the diffuse phase transition.
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