Bi2WTi3O12 ceramics are fabricated by the conventional solid-state reaction process. With increasing temperature the sample first has metallic behavior, then strong electrical fluctuations above 100℃, and finally exh...Bi2WTi3O12 ceramics are fabricated by the conventional solid-state reaction process. With increasing temperature the sample first has metallic behavior, then strong electrical fluctuations above 100℃, and finally exhib-its stable nonlinear properties characterized by semiconduc-tivity above 300℃ at low field (E ≤ 100 V/mm). The Ar-rhenius law for electrical conductivity by thermal activation is not suitable to explain the anomalous results. XRD analysis reveals that Bi2WO6 is the main phase and Bi4Ti3O12 is the second phase. Based on the phase transition of tungsten tri-oxide from room temperature to about 300℃, the electrical properties of Bi2WTi3O12 ceramics can be explained.展开更多
文摘Bi2WTi3O12 ceramics are fabricated by the conventional solid-state reaction process. With increasing temperature the sample first has metallic behavior, then strong electrical fluctuations above 100℃, and finally exhib-its stable nonlinear properties characterized by semiconduc-tivity above 300℃ at low field (E ≤ 100 V/mm). The Ar-rhenius law for electrical conductivity by thermal activation is not suitable to explain the anomalous results. XRD analysis reveals that Bi2WO6 is the main phase and Bi4Ti3O12 is the second phase. Based on the phase transition of tungsten tri-oxide from room temperature to about 300℃, the electrical properties of Bi2WTi3O12 ceramics can be explained.
