| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7886908 | Ceramics International | 2018 | 16 Pages |
Abstract
The orientation characteristics of the defect dipoles formed by acceptor ions (CuNbâ³â²) and oxygen vacancies (VO
-
- ) in CuO-doped (K0.48Na0.52)0.96Li0.04Nb0.805Ta0.075Sb0.12O3 piezoceramics were investigated. The ferroelectric and piezoelectric properties of the ceramics were obviously affected by the defect dipoles which are oriented along with the domains when poled under a dc electrical field of 3.5â¯kV/mm at the temperature near TC. The poled ceramics with 1.0-3.0â¯mol% CuO displayed strong asymmetric P-E loops and a large internal bias field (Ei), 3.89-4.57â¯kV/cm, when polarized at the temperature near TC. The enhanced piezoelectric coefficient d33, 186-192â¯pC/N, was obtained for the ceramics poled near TC when 0.02â¯â¤â¯xâ¯â¤â¯0.03. The ceramics with oriented defect dipoles showed a relatively good thermal stability of d33 until 180â¯Â°C.
-
- ) in CuO-doped (K0.48Na0.52)0.96Li0.04Nb0.805Ta0.075Sb0.12O3 piezoceramics were investigated. The ferroelectric and piezoelectric properties of the ceramics were obviously affected by the defect dipoles which are oriented along with the domains when poled under a dc electrical field of 3.5â¯kV/mm at the temperature near TC. The poled ceramics with 1.0-3.0â¯mol% CuO displayed strong asymmetric P-E loops and a large internal bias field (Ei), 3.89-4.57â¯kV/cm, when polarized at the temperature near TC. The enhanced piezoelectric coefficient d33, 186-192â¯pC/N, was obtained for the ceramics poled near TC when 0.02â¯â¤â¯xâ¯â¤â¯0.03. The ceramics with oriented defect dipoles showed a relatively good thermal stability of d33 until 180â¯Â°C.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yunwei Sheng, Yanqiu Huang, Chen Chen, Ming Zhang, Nan Deng, Lixia Ma,