by Takafumi Maeda, Tobias Hemsel, Takeshi Morita
Abstract:
[$Li_x(Na_0.52K_0.48)_1-x]NbO_3 (0 \leq x \leq 0.091)$ ceramics were synthesized using hydrothermal powders and the lithium doping content was controlled to optimize their piezoelectric properties. The raw KNbO$_3$ and NaNbO$_3$ powders were obtained separately by a hydrothermal method and LiNbO$_3$ powders were prepared by milling a commercial LiNbO$_3$ single crystal. These powders were mixed with ethanol at a molar ratio LiNbO$_3$: ($Na_0.52K_0.48$)NbO$_3 = x : 1-x$. The synthesized powders were sintered at 1060--1120 $\,^\circ$C for 2 h. We succeeded in obtaining highly dense [$Li_x(Na_0.52K_0.48)_1-x]NbO_3$ ceramics using hydrothermal powder. The X-ray diffraction patterns revealed that the crystal phase changed from orthorhombic to tetragonal at around x = 0.06. At this morphotropic phase boundary (MPB), the c/a ratio changed from 1.016 to 1.024 and the highest piezoelectric constant was obtained with the chemical component of [$Li_x(Na_0.52K_0.48)_1-x]NbO_3$. The obtained piezoelectric properties were as follows: $k_33 = 0.51, \epsilon 33^T/ \epsilon _0 = 836$ , $c_33^E = 46$ GPa, $d_33 = 203$ pC/N, and $T_c = 482 $\,^\circ$C$.
Reference:
Maeda, T.; Hemsel, T.; Morita, T.: Piezoelectric Properties of Li-Doped (K0.48Na0.52)NbO3 Ceramics Synthesized Using Hydrothermally-Derived KNbO3 and NaNbO3 Fine Powders. Japanese Journal of Applied Physics, The Japan Society of Applied Physics, volume 51, 2012.
Bibtex Entry:
@ARTICLE{Maeda2012,
author = {Takafumi Maeda and Tobias Hemsel and Takeshi Morita},
title = {Piezoelectric Properties of Li-Doped (K0.48Na0.52)NbO3 Ceramics Synthesized
Using Hydrothermally-Derived KNbO3 and NaNbO3 Fine Powders},
journal = {Japanese Journal of Applied Physics},
year = {2012},
volume = {51},
pages = {09MD08},
abstract = {[$Li_x(Na_0.52K_0.48)_1-x]NbO_3 (0 \leq x \leq 0.091)$ ceramics were
synthesized using hydrothermal powders and the lithium doping content
was controlled to optimize their piezoelectric properties. The raw
KNbO$_3$ and NaNbO$_3$ powders were obtained separately by a hydrothermal
method and LiNbO$_3$ powders were prepared by milling a commercial
LiNbO$_3$ single crystal. These powders were mixed with ethanol at
a molar ratio LiNbO$_3$: ($Na_0.52K_0.48$)NbO$_3 = x : 1-x$. The
synthesized powders were sintered at 1060--1120 $\,^{\circ}$C for
2 h. We succeeded in obtaining highly dense [$Li_x(Na_0.52K_0.48)_1-x]NbO_3$
ceramics using hydrothermal powder. The X-ray diffraction patterns
revealed that the crystal phase changed from orthorhombic to tetragonal
at around x = 0.06. At this morphotropic phase boundary (MPB), the
c/a ratio changed from 1.016 to 1.024 and the highest piezoelectric
constant was obtained with the chemical component of [$Li_x(Na_0.52K_0.48)_1-x]NbO_3$.
The obtained piezoelectric properties were as follows: $k_33 = 0.51,
\epsilon 33^T/ \epsilon _0 = 836$ , $c_33^E = 46$ GPa, $d_33 = 203$
pC/N, and $T_c = 482 $\,^{\circ}$C$.},
bdsk-url-1 = {http://jjap.jsap.jp/link?JJAP/51/09MD08/},
bdsk-url-2 = {http://dx.doi.org/10.1143/JJAP.51.09MD08},
doi = {10.1143/JJAP.51.09MD08},
file = {Maeda2012.pdf:Maeda2012.pdf:PDF},
numpages = {4},
publisher = {The Japan Society of Applied Physics},
timestamp = {2013.09.26},
url = {http://jjap.jsap.jp/link?JJAP/51/09MD08/}
}