Enhanced Piezoelectric Properties of (Na0.535K0.485)0.905Li0.095(Nb0.94Ta0.06)O3 –(Na0.5Bi0.5)TiO3 Lead-Free Piezoelectric Ceramics in the MPB Composition
| Autor: | Zong-Yang Shen, Yan Hong, Zu Gui Xiao, Yueming Li, Zhu Mei Wang |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Electromechanical coupling coefficient
Phase boundary Materials science Mechanical Engineering Crystal structure Piezoelectricity Tetragonal crystal system Mechanics of Materials visual_art Phase (matter) visual_art.visual_art_medium General Materials Science Dielectric loss Ceramic Composite material |
| Zdroj: | Key Engineering Materials. :1390-1394 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.512-515.1390 |
| Popis: | In this paper, end members of tetragonal phase (Na0.535K0.485)0.905Li0.095(Nb0.94Ta0.06)O3(abbreviated as NKLN) and rhombohedral phase (Na0.5Bi0.5)TiO3(abbreviated as NBT) were used to fabricate dense (1-x)NKLN-xNBT (x=0, 0.005, 0.01, 0.02, 0.03, 0.04) lead-free piezoelectric ceramics. By increasing the NBT content x value, the crystalline structure changes from tetragonal phase to rhombohedral one across a morphotropic phase boundary (MPB) composition of x=0.02. In this MPB composition, enhanced electrical properties were obtained as follows: piezoelectric constant d33=202 pC/N, planar electromechanical coupling coefficient kp=39.6%, relative dielectric constant εr=1020 and dielectric loss tgδ=2.67%, indicating that this ceramic was a promising lead-free piezoelectric material for practical applications. |
| Databáze: | OpenAIRE |
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