Abstract
Two new tungsten bronze ferroelectrics Sr 6− n Pr n Ti n Nb 10− n O 30 ( n = 1, 2) were synthesized and characterized. Sr 5PrTi 3Nb 7O 30 and Sr 4Pr 2Ti 4Nb 6O 30 had tetragonal filled tungsten bronze structure at room temperature, and exhibited weak ferroelectric nature with remnant polarizations ( P r ) of 0.81 and 0.8 μC cm −2, respectively. Sr 5PrTi 3Nb 7O 30 showed diffused relaxor behavior with the Curie temperature T c at around 70 °C (at 1 MHz), while Sr 4Pr 2Ti 4Nb 6O 30 showed diffused normal ferroelectric transition with T c at 182 °C . Their dense ceramics had dielectric constant of 550 and 325, and dielectric loss (tan δ) of 0.05 and 0.006 for Sr 5PrTi 3Nb 7O 30 and Sr 4Pr 2Ti 4Nb 6O 30 at 1 MHz, respectively. Heterogeneous mixtures of the two compounds might be used to fabricate temperature-stable dielectrics.
Published Version
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