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:: Volume 2, Issue 1 (6-2013) ::
2013, 2(1): 0-0 Back to browse issues page
Electrical properties of the (1-x)BNT-xBKT system near morphotropic phase boundary
Abstract:   (7847 Views)
Lead free Bi0.5 (Na1-xKx)0.5TiO3 piezoceramics (BNKTx) with various amount of potassium (x=0.18, 0.20, 0.22 and 0.24) around morphotropic phase boundary (MPB) were prepared via a conventional solid state reaction. The crystal structure, electrical properties and strain were significantly influenced by the amount of K+ substitution. The XRD patterns revealed that by increasing K+ amount the tetragonal phase increased as well as more K+ content resulted in the enhanced piezoelectric properties, a large piezoelectric constant d33=195 pC/N was obtained at x=0.20, however depolarization temperature (Td) reached to 100 oC. The BNKTx ceramics exhibited high remnant polarization Pr= 37.50 µC/cm2 of the MPB composition (x=0.20). The increase of K+ content destabilized the ferroelectric order of the BNKTx ceramics, leading to degradation of the remnant polarization, reduction of coercive field and changing the shape of hysteresis loop towards antiferroelectric phase. An outstanding large electric field induced strain (S=0.13%) under 1 kV/mm and normalized strain d_33^*= 1320 pm/V were obtained at the MPB for x=0.20
Keywords: Piezoelectric, Lead-free, BNKT, Strain
Full-Text [PDF 1275 kb]   (1621 Downloads)    
Type of Study: Research | Subject: General
Received: 2013/08/31 | Accepted: 2013/08/31 | Published: 2013/08/31
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Electrical properties of the (1-x)BNT-xBKT system near morphotropic phase boundary . Iranian Journal of Ceramic Science & Engineering. 2013; 2 (1)
URL: http://ijcse.ir/article-1-104-en.html

Volume 2, Issue 1 (6-2013) Back to browse issues page
نشریه علم و مهندسی سرامیک Iranian Journal of Ceramic Science & Engineering
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