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

Han, Hyoung-Su and Koruza, Jurij and Patterson, Eric A. and Schultheiß, Jan and Erdem, Emre and Jo, Wook and Lee, Jae-Shin and Rödel, Jürgen (2017):
Hardening behavior and highly enhanced mechanical quality factor in(K0.5Na0.5)NbO3–based ceramics.
37, In: Journal of the European Ceramic Society, (5), Elsevier, pp. 2083-2089, ISSN 09552219, [Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2017.01.013],
[Article]

Abstract

This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric prop-erties of (K0.5Na0.5)NbO3(KNN) ceramics modified with 0.38 mol% K5.4Cu1.3Ta10O29(KCT) and differentamounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing thesinterability 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 Eibcorresponds very well with the observed increase ofthe mechanical quality factor (Qm) from 112 to 2665 for 0.5 mol% CuO. Besides, addition of 0.5 mol% CuOto 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 withthe increased Eiband the resulting hardening behavior.

Item Type: Article
Erschienen: 2017
Creators: Han, Hyoung-Su and Koruza, Jurij and Patterson, Eric A. and Schultheiß, Jan and Erdem, Emre and Jo, Wook and Lee, Jae-Shin and Rödel, Jürgen
Title: Hardening behavior and highly enhanced mechanical quality factor in(K0.5Na0.5)NbO3–based ceramics
Language: English
Abstract:

This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric prop-erties of (K0.5Na0.5)NbO3(KNN) ceramics modified with 0.38 mol% K5.4Cu1.3Ta10O29(KCT) and differentamounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing thesinterability 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 Eibcorresponds very well with the observed increase ofthe mechanical quality factor (Qm) from 112 to 2665 for 0.5 mol% CuO. Besides, addition of 0.5 mol% CuOto 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 withthe increased Eiband the resulting hardening behavior.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 37
Number: 5
Publisher: Elsevier
Uncontrolled Keywords: Lead-free Piezoelectric ceramics KNN Hardening effect Mechanical quality factor
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 21 Feb 2017 06:48
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2017.01.013
Identification Number: doi:10.1016/j.jeurceramsoc.2017.01.013
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