Abstract
We have synthesized ferroelectrics of M6Ti2Nb8O30 (M=Ba, Sr) with filled tungsten-bronze structure. The microstructures and dielectric properties of the present materials have been investigated as well as the behavior and features of the ferroelectric phase transition. Similar to perovskite ABO3, tungsten-bronze structure consists of several BO6 octahedra. The close distortion of BO6 octahedra concluded from the 10c∕a ratios is observed in Ba6Ti2Nb8O30 and Sr6Ti2Nb8O30, and two ferroelectrics have the close Curie temperature (155°C for the former and 160°C for the latter at 1MHz). Deducing from Raman spectra at different temperatures around phase transition and the modified Curie-Weiss law, the ferroelectric phase transition of Ba6Ti2Nb8O30 and Sr6Ti2Nb8O30 may belong to the displacive transition. The obvious diffuse characteristics of the ferroelectric transition may be attributed to the disordered distributions of octahedra, as two kinds of BO6, i.e., TiO6 and NbO6, exist in one cell. The weak ferroelectric of the present materials are indicated from the P-E hysteresis loops, both with 2Pr of 4μC∕cm2.
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