Graded Ba1-xSrxTiO3 (BST) ceramics, which had a continuously varying graded
composition from one surface toward the other of the specimen, were examin
ed with respect to their dielectric property. Specimens were prepared by si
ntering superposed layers of green compacts of BST solid solutions with dif
ferent values of x. The electric relative permittivity of a single phase BS
T ceramic showed a peak at the Curie temperature, which shifted to lower te
mperatures with increasing x. On the other hand, the profile of relative pe
rmittivity vs temperature of the graded BST ceramic experienced a linear ch
aracteristic. Furthermore, its slope could be controlled by changing the vo
lume fraction of each layer. The relative permittivity was 4000-5500 +/- 5%
in the temperature range from 30 to 110 degreesC.