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(1 −
x
)BiFeO
3
·
x
(KBi)
1/2
TiO
3
ceramics have been prepared by solid-state reactions. The system has been shown to contain a continuous series of perovskite solid solutions. In the composition ranges
x
< 0.4, 0.4 <
x
< 0.9, and
x
> 0.9, the solid solutions have rhombohedral, orthorhombic, and tetragonal structures, respectively. The observed compositional phase transitions are accompanied by sharp changes in unit-cell volume. We describe the dielectric properties of the orthorhombic solid solutions, which demonstrate that these materials exhibit relaxor behavior.