CuO‐added KNbO3‐BaZrO3 lead‐free piezoelectric ceramics with low loss and large electric field‐induced strain

CuO‐added (1‐x)KNbO3‐x mol%BaZrO3 ceramics with 0.0≤x≤7.0 were sintered at 960°C. Large double polarization vs electric field (P‐E) and sprout‐shaped strain vs electric field (S‐E) hysteresis curves were obtained from the specimens with x≤2.0. They exhibited large polarizing electric fields (EP) owi...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2017-07, Vol.100 (7), p.2948-2957
Main Authors: Park, Jongseong, Kim, Dae‐Hyeon, Lee, Tae‐Gon, Cho, Sung‐Hoon, Park, Su‐Jin, Ryu, Jungho, Nahm, Sahn
Format: Article
Language:English
Subjects:
Barium zirconates
Copper oxides
Electric fields
energy conversion
Hysteresis
Lead free
lead‐free ceramics
Piezoelectric ceramics
piezoelectric materials/properties
Piezoelectricity
Polarization
Potassium niobates
Sintering
Solid phases
Vacancies
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Summary:CuO‐added (1‐x)KNbO3‐x mol%BaZrO3 ceramics with 0.0≤x≤7.0 were sintered at 960°C. Large double polarization vs electric field (P‐E) and sprout‐shaped strain vs electric field (S‐E) hysteresis curves were obtained from the specimens with x≤2.0. They exhibited large polarizing electric fields (EP) owing to the presence of a large number of defect dipoles (PDs) that formed between Cu2+ ions and oxygen vacancies. Small double P‐E hysteresis curves were observed for the specimens with x≥3.0 with reduced EP because of the decreased number of PDs and the presence of a polymorphic phase structure containing both orthorhombic and pseudocubic structures. In particular, the specimen with x=5.0 exhibited a large strain of 0.16% at 8.0 kV/mm with a small EP of 1.2 kV/mm and good fatigue property: this specimen maintained a strain of 0.13% at 6.0 kV/mm after 106 cycles of 3.0 kV/mm.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14826