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This paper reports the synthesis, microstructure and electrical properties of a new Ba 4 SrBiTi 3 Nb 7 O 30  ceramic. X-ray diffraction analysis shows that the sample crystallizes into tungsten bronze structure, and the space group is  P4bm . The electrical measurement results show that Ba 4 SrBiTi 3 Nb 7 O 30  exhibits good dielectric and ferroelectric properties. The temperature-dependent dielectric permittivity indicates that the transition temperature of the prepared Ba 4 SrBiTi 3 Nb 7 O 30  sample is around T m  ≈ 250K. With increasing the frequency, the dielectric peak moves to a lower temperature. Below 250 K, obvious polarization current can be detected, corresponding to the formation of spontaneous ferroelectric polarization. These results indicate the relaxor ferroelectric behavior of Ba 4 SrBiTi 3 Nb 7 O 30  ceramic.

A New Relaxor Ferroelectrics Ba 4 SrBiTi 3 Nb 7 O 30 with Tungsten Bronze Structure