Mechanochemically Synthesized Lead Magnesium Niobate

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Abstract
Lead magnesium niobate (PMN) of high sintered density has been successfully prepared by a mechanochemical fabrication technique from mixed oxides of PbO, MgO, and Nb 2 O 5 . The novel technique skips the phase‐forming calcination steps at intermediate temperatures that are almost always required in the most widely employed columbite method. The solid‐state reactions among constituent oxides are activated by mechanical energy instead of calcination at elevated temperatures. Nanosized PMN particles of perovskite structure with a minimized degree of particle agglomeration were formed when the oxide mixture was mechanically activated for 20 h. The resulting PMN powder was sintered to a density of ∼99% theoretical density at 1050°C for 1 h. The sintered PMN exhibited a peak dielectric constant of 18 080 at a frequency of 100 Hz at ‐11°C.

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