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Effect of Li2O on the defect polarization in CuO-added (K0.9Na0.1)NbO3 piezoelectric ceramics

Authors
Kim, Dae-HyeonPark, JongseongLee, Tae-GonCho, Sung-HoonPark, Su-JinLee, Ku-TakKim, Jong-HyunNahm, Sahn
Issue Date
11월-2017
Publisher
WILEY
Keywords
lead-free ceramics; low temperature; piezoelectric materials/properties
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.100, no.11, pp.5193 - 5201
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume
100
Number
11
Start Page
5193
End Page
5201
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81803
DOI
10.1111/jace.15047
ISSN
0002-7820
Abstract
CuO-added (LixK0.9-xNa0.1)NbO3 [C(LxK0.9-xN0.1)N] ceramics with 0.0 <= x <= 0.05 were well-sintered at 960 degrees C for 6 hours. The lattice parameters of the specimens decreased with the addition of Li2O. Defect polarization (PD) formed between Cu2+ ions and oxygen vacancies. Double polarization vs electric field (P-E) hysteresis and sprout-shaped strain vs electric field (S-E) curves were observed in these specimens with a large strain of 0.16% at 7.0 kV/mm, possibly owing to the presence of PD. When the P-E curve was measured at temperatures higher than 75 degrees C, the C(K0.9N0.1)N ceramic exhibited a normal P-E hysteresis curve, whereas the C(L0.04K0.86N0.1)N ceramic maintained the double P-E hysteresis curve up to 125 degrees C, indicating that Li2O increased the thermal stability of PD. The latter specimen also showed the sprout shaped S-E curve with a strain of 0.15% at 7.0 kV/mm after 104 cycles of a high electric field of 7.0 kV/mm.
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