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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1380 (August) (2010)  >  pp.706-710

Journal of the Ceramic Society of Japan
<<Previous article Vol.118  No.1380 (August) (2010)   pp.706 - 710 Next article>>

Cation distribution and piezoelectric properties of aluminum substituted La3Ta0.5Ga5.5O14 single crystals

Hiroaki TAKEDA1), Jun-ichi YAMAURA2), Takuya HOSHINA1) and Takaaki TSURUMI1)
1) Graduate School of Science and Technology, Tokyo Institute of Technology
2) Institute for Solid State Physics, The University of Tokyo


  We report the structure and electric properties of La3Ta0.5Ga5.5−xAlxO14 (LTGAx, x = 0.0 (LTG), 0.3 and 0.5) single crystals, with a Ca3Ga2Ge4O14-type structure, suitable for high temperature piezoelectric application. A single-crystal X-ray structure analysis reveals that Al atoms are distributed in all cation sites except for the decahedral site occupied by La, which favors instead the octahedral site. The piezoelectric moduli d11 kept a constant, whereas |d14| increased 14% with the increasing Al content, x, up to 0.5. The LTGA0.5 crystals showed a low temperature dependence (2% deviation from room temperature to 400°C) of d11 and a higher electric resistivity ρ than those of the LTG crystals. The Al substitution is effective for improving the electrical properties of the LTG.


Keyword:
Oxides, Crystal growth, Crystal structure, Cation distribution, Piezoelectricity, High temperature

Received: March 17, 2010
Accepted: May 20, 2010 , Published online: August 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan

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