Abstract
Phase-pure La0.52Sr0.28Mn1.2O3 manganite nanopowders with average crystallite sizes of 30, 60, and 200 nm have been synthesized using coprecipitation and multiple cold isostatic pressing at 1 GPa. The crystallite size is shown to have a significant effect on the electrical and magnetic properties of the nanopowders: with decreasing particle size, their resistivity rises by several orders of magnitude, their Curie temperature decreases significantly, and the peak in their magnetic susceptibility broadens. The electrical and magnetic properties of powder compacts are compared to those of ceramic samples. The powder compacts show conventional magnetic hysteresis behavior, whereas the ceramics produced by sintering the compacts at 1270 K have an anomalous hysteresis. A mechanism is proposed that accounts for the anomalous hysteresis behavior.
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