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

Jong Hyun Kim; Dae Hyeon Kim; In Tae Seo; Joon Hur; Ji Hyun Lee; Bo Yun Kim; Sahn Nahm

doi:10.1016/j.sna.2015.08.015

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

Jong Hyun Kim, Dae Hyeon Kim, In Tae Seo, Joon Hur, Ji Hyun Lee, Bo Yun Kim, Sahn Nahm

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

CuO assisted the densification of KNbO₃ (KN) ceramics sintered at 960 °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.

Original language	English
Pages (from-to)	9-16
Number of pages	8
Journal	Sensors and Actuators, A: Physical
Volume	234
DOIs	https://doi.org/10.1016/j.sna.2015.08.015
Publication status	Published - 2015 Oct 1

Keywords

Double polarization versus electric field loop
Hardening effect
Lead-free piezoelectrics
Sprout-shaped strain versus electric field loop

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering

Access to Document

10.1016/j.sna.2015.08.015

Cite this

@article{57645cde0e9b4469972b4d55eafdd624,

title = "Effect of CuO on the ferroelectric and piezoelectric properties of lead-free KNbO3 ceramics",

abstract = "CuO assisted the densification of KNbO3 (KN) ceramics sintered at 960 °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 Qm value of 3005 with a large unipolar strain of 0.15% at 8.0 kV/mm.",

keywords = "Double polarization versus electric field loop, Hardening effect, Lead-free piezoelectrics, Sprout-shaped strain versus electric field loop",

author = "Kim, {Jong Hyun} and Kim, {Dae Hyeon} and Seo, {In Tae} and Joon Hur and Lee, {Ji Hyun} and Kim, {Bo Yun} and Sahn Nahm",

note = "Funding Information: This work was supported by the Industrial Strategic Technology Development Program , 10041232 , “Development of synthesis method of exfoliated inorganic nanosheets with a high dielectric constant of >300 and the corresponding thin films applicable for the fabrication of high performance MLCC” funded by the Ministry of Knowledge Economy (MKE, Korea) . Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved.",

year = "2015",

month = oct,

day = "1",

doi = "10.1016/j.sna.2015.08.015",

language = "English",

volume = "234",

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journal = "Sensors and Actuators, A: Physical",

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T1 - Effect of CuO on the ferroelectric and piezoelectric properties of lead-free KNbO3 ceramics

AU - Kim, Jong Hyun

AU - Kim, Dae Hyeon

AU - Seo, In Tae

AU - Hur, Joon

AU - Lee, Ji Hyun

AU - Kim, Bo Yun

AU - Nahm, Sahn

N1 - Funding Information: This work was supported by the Industrial Strategic Technology Development Program , 10041232 , “Development of synthesis method of exfoliated inorganic nanosheets with a high dielectric constant of >300 and the corresponding thin films applicable for the fabrication of high performance MLCC” funded by the Ministry of Knowledge Economy (MKE, Korea) . Publisher Copyright: © 2015 Elsevier B.V. All rights reserved.

PY - 2015/10/1

Y1 - 2015/10/1

N2 - CuO assisted the densification of KNbO3 (KN) ceramics sintered at 960 °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 Qm value of 3005 with a large unipolar strain of 0.15% at 8.0 kV/mm.

AB - CuO assisted the densification of KNbO3 (KN) ceramics sintered at 960 °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 Qm value of 3005 with a large unipolar strain of 0.15% at 8.0 kV/mm.

KW - Double polarization versus electric field loop

KW - Hardening effect

KW - Lead-free piezoelectrics

KW - Sprout-shaped strain versus electric field loop

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