Low-temperature fabrication of 0.65 PMN–0.35 PT by a mixed oxide method |
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Authors: | Kyoung Ran Han Jeong Wung Jeong Chang-Sam Kim Young-Soon Kwon |
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Affiliation: | aDivision of Materials Science and Engineering, Korea Institute of Science and Technology, Seoul 131-791, Korea;bDepartment of Chemistry, Catholic University of Korea, Puchon 420-743, Korea |
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Abstract: | Single-phase perovskite 0.65 PMN–0.35 PT was achieved at low temperature by a conventional mixed oxide method. It was prepared by ball-milling a mixture of PbO(orthorhombic), TiO2, Nb2O5 and (MgCO3)4Mg(OH)2·5H2O instead of MgO and heat treatment at 800 °C for 2 h. The formation was studied by means of DSC, FT-IR, Coupled TG-Mass, XRD, and SEM. It proceeded via formation of PbO(tetragonal) and Pb2Nb2O7(P2N) intermediates to form perovskite phase. The pure perovskite PMN-PT powder was obtained in particle size of 0.5–0.8 μm, agglomerate-free, and pseudo-cube. The powder calcined at 600 °C was sintered to 97% T.D. at 900–1000 °C for 2 h and showed room temperature dielectric constant of 3200, loss of 1–2%, and specific resistance of 5 × 1011 Ω cm. |
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Keywords: | Single-phase perovskite 0 65 PMN– 0 35 PT Low-temperature single calcination Mixed oxide method |
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