Abstract: Bi₃NbTiO₉ (BNT) ceramic material with 95%～97% of the theoretical density was prepared by the conventional mixed-oxide method. Its Curie temperature (T_c) of 914℃ was measured to
be almost the highest one among those of all the ceramics known up to date. And obviously, the piezoelectric ceramic can be used at higher
temperatures. The crystal structure of the ceramic was examined by XRD method. Anisometric plate-like crystalline grains were
observed by SEM, which revealed the layered structure of the material. Furthermore, the hysteresis (P-E) loop measurement showed a typical hard
ferroelectricity in the Bi₃NbTiO₉ ceramics, and the piezoelectric constant (d₃₃) measured was 7pC/N.

Key words: Bi₃NbTiO₉, ferroelectricity, dielectric properties, ceramics