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Shear‐Mode Piezoelectric Properties of Modified‐(K,Na)NbO 3 Ceramics for “Hard” Lead‐Free Materials
Author(s) -
Lim Jong Bong,
Zhang Shujun,
Lee Hyeong Jae,
Jeon JaeHo,
Shrout Thomas R.
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03870.x
Subject(s) - materials science , piezoelectricity , ceramic , natural bond orbital , composite material , lead (geology) , shear (geology) , mineralogy , chemistry , geology , density functional theory , computational chemistry , geomorphology
(K 0.45 Na 0.55 )NbO 3 –0.5 mol% K 4 CuNb 8 O 23 [KNN–KCN] solid solution was synthesized and its shear mode dielectric and piezoelectric properties were characterized as a function of temperature. The doped KNN material was found to possess comparable electric resistivity, piezoelectric, and electromechanical properties with pure KNN, but with a much higher mechanical Q m value, being on the order of 1500. The dielectric permittivity K 11 T and piezoelectric coefficients d 15 for KNN–KCN were found to increase with the increasing temperature, while the electromechanical coupling factors k 15 maintain a similar value till the phase transition temperature ( T o − t ∼200°C), above which, the properties drop significantly due to depolarization. The good temperature‐dependent properties, together with its high mechanical Q m , demonstrate a practical potential of KNN–KCN materials for high power shear‐mode applications.