Ferroelectric ceramics in the Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-K/sub 0.5/Bi/sub 0.5/TiO/sub 3/, Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/ and K/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/ systems

Abstract

Abstracf -The study of the Nao.sBi0.sTiQ -K0.5Bio.sTi03, Na0.5Bio.sTi03 -PbTiOg and Ko.SBi0.STiOj -PbTi03 systems was carried out using X-ray diffraction, DSC and dielectric measurements. The limits of the rhombohedral (Nao.SBi0.sTiQ -rich side) and orthorhombic (Ko.5Bi0.5TiO3, and PbTi03-rich side) solid solutions were determined, as well as the evolutions of their lattice parameters as a function of composition.

Microstructures and electrical properties of Bi0.5-(Na1−x−y K x Li y )0.5TiO3 lead-free piezoelectric ceramics

“…A good candidate of lead-free piezoelectric ceramics is Bi 0.5 Na 0.5 TiO 3 (abbreviated as BNT), which was found by Smolensky et al, has a relatively large remanent polarization (P r ＝ 38 μC/cm 2 ) [1,2] and high curie temperature (T c ＝ 320 ℃ ). However, compared with PZT ceramics, pure BNT piezoelectric ceramics are difficult to pole because of its relatively large coercive field (E c ＝ 73 kV/cm) and high electrical conductivity.…”