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Wegrzyn, M.
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Publications (3/3 displayed)
- 2013Multiwalled carbon nanotubes incorporated into a miscible blend of poly(phenylenether)/polystyrene - processing and characterizationcitations
- 2012Effect of Processing Method on Mechanical Properties of PC/ABS-MWCNT nanocompositescitations
- 2011Microstructure and piezoelectric properties of CuO added (K, Na, Li)NbO3 lead-free piezoelectric ceramicscitations
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article
Microstructure and piezoelectric properties of CuO added (K, Na, Li)NbO3 lead-free piezoelectric ceramics
Abstract
Lead-free Na0.5K0.5NbO3 (NKN) and Na0.475K0.475Li0.05NbO3 (NKLN) ceramics doped with CuO were prepared by the mixed oxide route. The powders were calcined at 850-930°C and sintered at 850-1100°C. Small additions of CuO reduced the sintering temperature and increased the density to 96% theoretical. Cu first appears to enter the A site then the B site. In NKLN the orthorhombic-tetragonal and tetragonal-cubic phase transitions are approximately 150°C lower and 50°C higher, respectively than in NKN. With increasing addition of Cu to NKN and NKLN the remanent polarization (Pr) increased and coercive field (Ec) decreased. NKLN prepared with 0.4wt% CuO exhibited a saturation polarization (Psat) of 30μC/cm2, remanent polarization (Pr) of 27μC/cm2 and coercive field (Ec) of 1.0kV/mm. CuO caused the NKLN ceramics to harden considerably; the mechanical quality factor (Qm) increased from 50 to 260, d33∼285 and piezoelectric coupling factors were >0.4. © 2010 Elsevier Ltd.