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°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°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°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.
Original language | English |
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Pages (from-to) | 5193-5201 |
Number of pages | 9 |
Journal | Journal of the American Ceramic Society |
Volume | 100 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2017 Nov |
Keywords
- lead-free ceramics
- low temperature
- piezoelectric materials/properties
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry