Evaluation of Piezoelectric Properties for KNbO3-Based Ceramics

Potassium niobate, KNbO 3 (KN), based ceramics were prepared by a modified conventional ceramic fabrication process to characterize their piezoelectric properties. KN+MnCO 3 0.1 wt% ceramic in this study showed a high density ratio > 95% and a high resistivity, ρ, of about 10 12 Ω ·cm with nondel...

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Bibliographic Details
Published in:Ferroelectrics 2009-01, Vol.381 (1), p.191-195
Main Authors: Nagata, Hajime, Hirosue, Tadayuki, Hikita, Kouhei, Hiruma, Yuji, Takenaka, Tadashi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectrics, piezoelectrics, and ferroelectrics and their properties
electromechanical coupling factor
Exact sciences and technology
KNbO
Lead-free
Physics
piezoelectric properties
piezoelectric strain constant
Piezoelectricity and electromechanical effects
potassium niobate
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Summary:Potassium niobate, KNbO 3 (KN), based ceramics were prepared by a modified conventional ceramic fabrication process to characterize their piezoelectric properties. KN+MnCO 3 0.1 wt% ceramic in this study showed a high density ratio > 95% and a high resistivity, ρ, of about 10 12 Ω ·cm with nondeliquescent properties. Electromechanical coupling factor, k 33 , and piezoelectric strain constant, d 33 , of KN+MnCO 3 0.1 wt% indicated relatively large values of 0.51 and 80.8 pC/N, respectively. In (15) mode, k 15 , d 15 and Q m , were 0.50, 169 pC/N and 132, respectively. The d 15 is about 2 times as large as the d 33 . The shear mode vibration of KN-based ceramics seems to be a considerably promising candidate for actuator and high power applications.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150190902876769