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PHASE TRANSITION AND ELECTRICAL PROPERTIES OF NEW LEAD-FREE (Na0.5K0.5)NbO3–Ba(Ti0.95Hf0.05)O3 SOLID SOLUTION CERAMICS

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Author(s): DANYA LV | RUZHONG ZUO | SHI SU | JIAN FU | YI LIU

Journal: Ceramics-Silikáty
ISSN 0862-5468

Volume: 55;
Issue: 2;
Start page: 101;
Date: 2011;
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Keywords: Lead-free piezoelectric ceramics | Ferroelectricity | Piezoelectricity

ABSTRACT
New lead-free piezoelectric ceramics (1-x)(Na0.5K0.5)NbO3–xBa(Ti0.95Hf0.05)O3 (NKN-xBTH) doped with 0.8 mol.% CuO have been successfully fabricated by traditional solid state sintering. Owing to complex atomic occupation at A-sites and B-sites, the ferroelectric phase transition of NKN becomes more and more diffuse with increasing BTH content. On the other hand, it was found that the addition of a small amount of BTH shifts an orthorhombic-tetragonal polymorphic phase transformation of pure NKN composition downwards to room temperature. The two-phase transition zone was identified approximately at 0.04 < x < 0.06 and the ceramic with x = 0.06 possesses obviously enhanced electrical properties: d33 = 185 pC/N, kp = 0.38, ε33 T = 1690, Qm = 108 and Tc = 267 °C, compared to pure NKN.
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