Piezoelectric properties of (K0.5Na0.5)1−xLix(Nb0.96Sb0.04)O3 ceramics prepared from nanocrystalline powders
作者： Roopam Gaur , K. Chandramani Singh , Radhapiyari Laishram
DOI: 10.1016/J.CERAMINT.2014.09.074
关键词:
摘要: Abstract Lead-free (K0.5Na0.5)1−xLix(Nb0.96Sb0.04)O3 (x=0, 0.02, 0.03, 0.04, 0.05, 0.06) nanocrystalline powders were synthesized by conventional solid state reaction followed high-energy milling. The sintered for 2–3 h within the temperature range of 1050–1090 °C. resulting ceramic possesses orthorhombic symmetrical perovskite structure. Li substitution shifts Curie (Tc) and orthorhombic-tetragonal transition (Tot) ceramics slightly to higher lower temperatures, respectively. A small amount content (x=0.02) suppresses coarse grains bimodal grain size distribution with no content, in a significant enhancement its bulk density. Further addition leads coarsening poorer Consequently, density (ρ), room dielectric constant (er), remnant polarization (Pr) piezoelectric charge coefficient (d33) found be optimum (K0.49Na0.49Li0.02)(Nb0.96Sb0.04)O3 ceramic, ρ=4.38 g/cm3, er=445, Pr=14.9 μC/cm2 d33=180 pC/N. study reveals that traces aid densification during sintering thereby improving properties ceramics.
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