Hardening behavior and highly enhanced mechanical quality factor in (K0.5Na0.5)NbO3–based ceramics

Hyoung Su Han; Jurij Koruza; Eric A. Patterson; Jan Schultheiß; Emre Erdem; Wook Jo; Jae Shin Lee; Jürgen Rödel

doi:10.1016/j.jeurceramsoc.2017.01.013

Hardening behavior and highly enhanced mechanical quality factor in (K_0.5Na_0.5)NbO₃–based ceramics

Hyoung Su Han, Jurij Koruza, Eric A. Patterson, Jan Schultheiß, Emre Erdem, Wook Jo, Jae Shin Lee, Jürgen Rödel^*

^*Corresponding author for this work

Institute of Materials Science, Joining and Forming (3030)

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

Abstract

This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric properties of (K_0.5Na_0.5)NbO₃ (KNN) ceramics modified with 0.38 mol% K_5.4Cu_1.3Ta₁₀O₂₉ (KCT) and different amounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing the sinterability of KNN. The internal bias field (E_ib) increased from 0.3 kV/mm to 0.58 kV/mm at 0.5 mol% CuO–added KNN+KCT ceramics. The increase of E_ib corresponds very well with the observed increase of the mechanical quality factor (Q_m) from 112 to 2665 for 0.5 mol% CuO. Besides, addition of 0.5 mol% CuO to KNN+KCT resulted in a large increase of the EPR signal, which is related to the increased amount Cu²⁺ and a corresponding increase of the concentration of defect dipoles. This result is in good agreement with the increased E_ib and the resulting hardening behavior.

Original language	English
Pages (from-to)	2083-2089
Number of pages	7
Journal	Journal of the European Ceramic Society
Volume	37
Issue number	5
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2017.01.013
Publication status	Published - 1 May 2017

Keywords

Hardening effect
KNN
Lead-free
Mechanical quality factor
Piezoelectric ceramics

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2017.01.013

Cite this

@article{b763dcedf2934403a69c8bf46b8dd039,

title = "Hardening behavior and highly enhanced mechanical quality factor in (K0.5Na0.5)NbO3–based ceramics",

abstract = "This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric properties of (K0.5Na0.5)NbO3 (KNN) ceramics modified with 0.38 mol% K5.4Cu1.3Ta10O29 (KCT) and different amounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing the sinterability of KNN. The internal bias field (Eib) increased from 0.3 kV/mm to 0.58 kV/mm at 0.5 mol% CuO–added KNN+KCT ceramics. The increase of Eib corresponds very well with the observed increase of the mechanical quality factor (Qm) from 112 to 2665 for 0.5 mol% CuO. Besides, addition of 0.5 mol% CuO to KNN+KCT resulted in a large increase of the EPR signal, which is related to the increased amount Cu2+ and a corresponding increase of the concentration of defect dipoles. This result is in good agreement with the increased Eib and the resulting hardening behavior.",

keywords = "Hardening effect, KNN, Lead-free, Mechanical quality factor, Piezoelectric ceramics",

author = "Han, {Hyoung Su} and Jurij Koruza and Patterson, {Eric A.} and Jan Schulthei{\ss} and Emre Erdem and Wook Jo and Lee, {Jae Shin} and J{\"u}rgen R{\"o}del",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = may,

day = "1",

doi = "10.1016/j.jeurceramsoc.2017.01.013",

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pages = "2083--2089",

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T1 - Hardening behavior and highly enhanced mechanical quality factor in (K0.5Na0.5)NbO3–based ceramics

AU - Han, Hyoung Su

AU - Koruza, Jurij

AU - Patterson, Eric A.

AU - Schultheiß, Jan

AU - Erdem, Emre

AU - Jo, Wook

AU - Lee, Jae Shin

AU - Rödel, Jürgen

PY - 2017/5/1

Y1 - 2017/5/1

N2 - This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric properties of (K0.5Na0.5)NbO3 (KNN) ceramics modified with 0.38 mol% K5.4Cu1.3Ta10O29 (KCT) and different amounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing the sinterability of KNN. The internal bias field (Eib) increased from 0.3 kV/mm to 0.58 kV/mm at 0.5 mol% CuO–added KNN+KCT ceramics. The increase of Eib corresponds very well with the observed increase of the mechanical quality factor (Qm) from 112 to 2665 for 0.5 mol% CuO. Besides, addition of 0.5 mol% CuO to KNN+KCT resulted in a large increase of the EPR signal, which is related to the increased amount Cu2+ and a corresponding increase of the concentration of defect dipoles. This result is in good agreement with the increased Eib and the resulting hardening behavior.

AB - This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric properties of (K0.5Na0.5)NbO3 (KNN) ceramics modified with 0.38 mol% K5.4Cu1.3Ta10O29 (KCT) and different amounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing the sinterability of KNN. The internal bias field (Eib) increased from 0.3 kV/mm to 0.58 kV/mm at 0.5 mol% CuO–added KNN+KCT ceramics. The increase of Eib corresponds very well with the observed increase of the mechanical quality factor (Qm) from 112 to 2665 for 0.5 mol% CuO. Besides, addition of 0.5 mol% CuO to KNN+KCT resulted in a large increase of the EPR signal, which is related to the increased amount Cu2+ and a corresponding increase of the concentration of defect dipoles. This result is in good agreement with the increased Eib and the resulting hardening behavior.

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KW - Mechanical quality factor

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