Abstract
Pure-perovskite 0.64Pb(Ni1/3Nb2/3)O3–0.36PbTiO3 (PNN–PT) powder has been successfully synthesized by only one-step calcination using a coating method. SEM photograph shows that PNN–PT powder with the size of 2–4 μm is cubic and well dispersed. Based on X-ray diffraction analysis, solid-state reactions in the process of calcination in PbO–Nb2O5–TiO2–NiO system are investigated. In comparison with conventional solid state method, the single-calcination synthesis mechanism of pyrochlore-free lead-based niobate ferroelectrics using a coating method is tentatively proposed. A typical coating structure of Ni precipitate-coated Nb2O5 powder facilitates the formation of perovskite PNN–PT phase at a relatively low calcination temperature, resulting in the successful synthesis of pyrochlore-free PNN–PT powder in one-step calcination at 900°C.
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