Abstract

(Ba 0.68− x Sr 0.308Bi 0.006Na 0.006Mg x )(Ti 0.99Sn 0.01)O 3 ceramics were synthesized by solid-state reaction process. The samples ( X ≤ 0.010) are a mixture of cubic (major) and rhombohedral (minor) phases. The rhombohedral phase causes a large dielectric loss in low temperature regions and plays an important role in diffuse phase transition of ceramics. While X > 0.010, the rhombohedral phase decreases and gradually disappears. The dielectric loss of ceramics in the low temperature regions decreases, and the samples change from the diffuse phase transition to the phase transition of second order, and then to of first order. In the temperature range of 270–370 °C, intrinsic conduction dominates conductivity of ceramics.

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