Electric Field-Induced Strain Behavior in Lithium- and Copper-Added Potassium Sodium Niobate Piezoceramics and 1–3 Piezocomposites
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, cilt.58, sa.9, ss.1804-1810, 2011 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 58 Sayı: 9
- Basım Tarihi: 2011
- Doi Numarası: 10.1109/tuffc.2011.2017
- Dergi Adı: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.1804-1810
- Maltepe Üniversitesi Adresli: Evet
Özet
Potassium sodium niobate (KNN)-based lead- free materials were prepared and their field-induced strain behaviors were investigated. Ceramic lead-free piezoelectric materials were prepared in bulk and fiber forms with 1 mol% CuO-added potassium sodium niobate K0.5Na0.5NbO3 and x = 7 mol% lithium-modified (K0.5-x/2Na0.5-x/2Lix)NbO3 compositions. Fibers were drawn using a novel alginate gelation technique. Piezocomposites were prepared from these fibers with 1–3 connectivity and an epoxy matrix. A fully recoverable electrostrain of up to approximately 0.11% was observed in the CuO-added sample, whereas the Li-modified sample yielded up to 0.10% at 50 kV/cm electric field. A strain value of up to approximately 0.03% at 50 kV/cm electric field was obtained for piezocomposites prepared from lithium-modified fibers. The high-field converse piezoelectric coefficient was calculated from the strain-electric field (x-E) graph for all samples. Strain characteristics of the bulk and piezocomposite samples were analyzed based on the variation of strain with respect to square of the polarization (x-P2) to determine the electrostrictive contribution to the strain. © 2011, The Institute of Electrical and Electronics Engineers, Inc.