Effect of CuO on the ferroelectric and piezoelectric properties of lead-free KNbO<inf>3</inf> ceramics

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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

CuO assisted the densification of KNbO<inf>3</inf> (KN) ceramics sintered at 960 °C through the formation of a CuO-related liquid phase. Most of the Cu<sup>2+</sup> ions entered the Nb<sup>5+</sup> 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 (Cu<sup>2+</sup>) 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<inf>m</inf> value of 3005 with a large unipolar strain of 0.15% at 8.0 kV/mm.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalSensors and Actuators, A: Physical
Volume234
DOIs
Publication statusPublished - 2015 Oct 1

Fingerprint

Ferroelectric materials
Lead
Electric fields
ceramics
Ions
Oxygen vacancies
Densification
Superconducting transition temperature
Aging of materials
Polarization
Defects
hardeners
Liquids
electric fields
densification
ions
liquid phases
transition temperature
dipoles
defects

Keywords

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

ASJC Scopus subject areas

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

Cite this

Effect of CuO on the ferroelectric and piezoelectric properties of lead-free KNbO<inf>3</inf> ceramics. / Kim, Jong Hyun; Kim, Dae Hyeon; Seo, In Tae; Hur, Joon; Lee, Ji Hyun; Kim, Bo Yun; Nahm, Sahn.

In: Sensors and Actuators, A: Physical, Vol. 234, 01.10.2015, p. 9-16.

Research output: Contribution to journalArticle

Kim, Jong Hyun ; Kim, Dae Hyeon ; Seo, In Tae ; Hur, Joon ; Lee, Ji Hyun ; Kim, Bo Yun ; Nahm, Sahn. / Effect of CuO on the ferroelectric and piezoelectric properties of lead-free KNbO<inf>3</inf> ceramics. In: Sensors and Actuators, A: Physical. 2015 ; Vol. 234. pp. 9-16.
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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.

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