Some properties of NaO_0.5Bi_0.5TiO₃

Abstract

The specific heat of Na,,.&,TiO, crystal in the temperature range 300-650 K and the changes of spontaneous polarization of Na&h;TiO, ceramic in the temperature range 4.2-90 K were measured. The calorimetric measurements showed that the anomaly of specific heat exists in the temperature range where the phase transition rate from the rhomhedral phase to the tetragonal phase is utmost. From lowtemperature pyroeleceic effect a phonon wave number equal to 128 cm-' was found to have the main share in the temperature changes of spontaneous polarization.

Effect of sintering procedure on the resistivity of (1−x)BaTiO3−x(Bi0.5Na0.5)TiO3 ceramics

“…However, Lead had been prohibited to use in the electric devices, considering the environmental protection problems. Recently, some other kinds of perovskite-type compounds [10][11][12] were doped into BT to replace the traditional PT, in order to increase the Curie temperature of BT-based PTCR ceramics.…”

The Growth and Properties of Lead-Free Ferroelectric Single Crystals

“…Therefore, the (1−x)(Na0.5Bi0.5)TiO3-xBaTiO3 [abbreviated as NBT-BT 100(1−x)/100x or NBBT] solid solutions are considered to be a promising candidate for a lead-free piezoelectric material. Then NBT-BT single crystals will provide an opportunity to conveniently investigate the dielectric and piezoelectric properties [7][8][9][10][11].…”

Raman and dielectric studies of 0.95Na0.5Bi0.5TiO3-0.05PbTiO3ceramic

“…At room temperature, NBT has a rhombohedral R3c phase. On the other hand, PT which is a well known classic ferroelectric, at room temperature has P4mm tetragonal structure [2][3][4][5][6][7].…”

“…Low-lead and lead-free ceramics can be used instead of lead-based materials if they have suitable properties. Na 0.5 Bi 0.5 TiO 3 (NBT) and NBT-based compounds are considered to be promising candidates as low lead and lead-free materials to replace lead-based ceramics [2][3].…”