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Effect of CuO on the ferroelectric and piezoelectric properties of lead-free KNbO3 ceramics

Authors
Kim, Jong-HyunKim, Dae-HyeonSeo, In-TaeHur, JoonLee, Ji-HyunKim, Bo-YunNahm, Sahn
Issue Date
1-10월-2015
Publisher
ELSEVIER SCIENCE SA
Keywords
Hardening effect; Lead-free piezoelectrics; Double polarization versus electric field loop; Sprout-shaped strain versus electric field loop
Citation
SENSORS AND ACTUATORS A-PHYSICAL, v.234, pp.9 - 16
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS A-PHYSICAL
Volume
234
Start Page
9
End Page
16
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/92221
DOI
10.1016/j.sna.2015.08.015
ISSN
0924-4247
Abstract
CuO assisted the densification of KNbO3 (KN) ceramics sintered at 960 degrees C through the formation of a CuO-related liquid phase. Most of the Cu2+ ions entered the Nb5+ sites of the KN ceramics and acted as a hardener. In addition, the CuO-added KN (CKN) ceramics exhibited a double polarization versus electric field (P-E) loop and a sprout-shaped strain versus electric field (S-E) loop. The formation of these was attributed to the presence of defect dipoles formed by acceptor ions (Cu2+) and oxygen vacancies. In fact, owing to the high orthorhombic-to-tetragonal transition temperature of the CKN ceramics, the double P-E and sprout-shaped S-E loops developed without an aging process. Furthermore, the 1.0 mol% CuO-added KN ceramic exhibited a very high Q(m) value of 3005 with a large unipolar strain of 0.15% at 8.0 kV/mm. (C) 2015 Elsevier B.V. All rights reserved.
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