Abstract: The characterizations of strain S with electric E in converse piezoelectric effect for [Pb_x(Ba, Sr)_1-x]₄(Na_0.88Li_0.12)₂Nb₁₀O₃₀ x=0.64
(PBNN) piezoelectric ceramic with tungsten bronze (T.B.) structure were studied. The excellent micro-displacement properties, such as high
linearity, low hysteresis and high coercive field, were exhibited for PBNN ceramic, which were suitable to prepare servo piezoelectric
actuators. According to X-ray diffraction structure analysis and measurement results of the relation of S with E, it was shown that
in the PBNN piezoelectric ceramic with T.B. structure only the 180° switch of the domain exists without 90° switch of the domain, which inherently exists in PZT based piezoelectric
ceramics with peroveskite (P.S.) structure. For PBNN ceramic the excellent characterization of S with E was due to their no 90°
switch of the domain. It is found that by more carefully measuring and analyzing the curve of S with E a slight increase of slope (about 5%)
occurs at a higher electric field ～350V/mm, which had been explained from pseudo-orthorhombic crystal structure of PBNN ceramic.

Key words: piezoelectric ceramic, tungsten bronze crystal structure, converse piezoelectric effect, piezo-actuator, 90° switch of the domain