Mechanical stability of (Li,Na,K)NbO3-based multilayered piezoceramics with Ag/Pd inner electrodes

Author:

Nishiyama Hiroshi1ORCID,Ito Ryo1ORCID,Aizawa Tomoya1ORCID,Goto Takayuki1ORCID,Shimizu Hiroyuki1ORCID

Affiliation:

1. R&D Center, TAIYO YUDEN CO., LTD., 5607-2 Nakamuroda, Takasaki, Gunma 370-3347, Japan

Abstract

Lead-free (Li,Na,K)NbO3-based multilayered piezoceramics with Ag0.9Pd0.1 inner electrodes were prepared, and their large-signal piezoelectric properties under combined electrical and mechanical loadings were characterized at room temperature. The piezoelectric constant [Formula: see text] of the multilayer was 96 pm/V with an applied unipolar field of 5 kV/mm under zero stress. More importantly, a favorable stress stability of [Formula: see text] was observed, with a slight variation [Formula: see text] of [Formula: see text], when the uniaxial stress was increased from −5 to −80 MPa. Further investigations of temperature-dependent x-ray diffraction, permittivity, and an energy-dispersive x-ray spectrometer revealed that the mechanical stability of [Formula: see text] was due to a shift in phase transition temperature caused by a solid solution of the Ag inner electrode to the A-site of (Li,Na,K)NbO3 piezoceramics.

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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