Low-temperature fabrication of 0.65 PNM-0.35 PT by a mixed oxide method

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)(4)Mg(OH)(2)center dot 5H(2)O instead of MgO and heat treatment at 800 degrees 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 PNM-PT powder was obtained in particle size of 0.5-0.8 mu m, agglomerate-free, and pseudo-cube. The powder calcined at 600 degrees C was sintered to similar to 97% T.D. at 900-1000 degrees C for 2 h and showed room temperature dielectric constant of similar to 3200, loss of 1-2%, and specific resistance of similar to 5 x 10(11) Omega cm. (c) 2006 Elsevier B.V. All rights reserved.