Search

Your search keyword '"Tanaka, Satoshi"' showing total 23 results
Start Over Author "Tanaka, Satoshi" Journal key engineering materials
23 results on '"Tanaka, Satoshi"'

22. Piezoelectric Properties of c-Axis-Oriented (Sr,Ca)2NaNb5O15 Piezoelectric Ceramics with Single-Plate Type and Multilayered Type Fabricated Using Crystal-Oriented Sheet Forming

Author

Shimizu, Hiroyuki, Doshida, Yutaka, Tanaka, Satoshi, and Uematsu, Keizo

Abstract

Recently, we have developed crystal-oriented sheet forming (COSF) process from green sheet process and high-magnetic-field method. We formed c-axis-oriented (Sr,Ca)2NaNb5O15 (SCNN) sheets by the COSF process, and succeeded in realizing c-axis-oriented single-plate type piezoelectric ceramics (O-SP) and c-axis-oriented multilayered type piezoelectric ceramics (O-MLPC) for SCNN. From the measurement results of displacement induced by electric field, it was clarified that effective d33 of the O-SP was 210~240 pm/V. This value was about 3 times larger than that of the randomly oriented single-plate type, which was 70% of that of single crystal. Moreover, it was confirmed that O-MLPC indicated displacements 2.5 times as large as that of the conventional multilayer piezoelectric ceramics. In this study, we clarified that piezoelectric properties in bulk and multilayer structure can be drastically enhanced using the COSF process.

Published
2009
Full Text
View/download PDF

23. Growth and Electric Properties of Al-Substituted Langasite-Type La3Ta0.5Ga5.5O14 Crystals at High Temperature

Author

Takeda, Hiroaki, Tanaka, Satoshi, Shimizu, Hiroyuki, Nishida, Takashi, and Shiosaki, Tadashi

Abstract

We report an effective substitution of aluminum for gallium in langasite-type La3Ta0.5Ga5.5O14 (LTG) crystals for use in a pressure sensor at high temperature. Al-substituted LTG (La3Ta0.5Ga5.5-xAlxO14; LTGAx) single crystals up to the solubility limit of x=0.5 have been grown by the conventional Czochralski technique. The electric properties of the LTGAx crystals were investigated and compared with those of LTG. By Al substitution, the piezoelectric constant d11 and the electromechanical coupling factors (k12) became slightly larger. The LTGAx crystals showed a lower temperature dependence of d11 and a higher electric resistivity ρ than those of the LTG crystals.

Published
2006
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results