Abstract
The effect of preparation conditions on the structure and the magnetic properties of PPH-FeSO4 complexes was investigated by elemental analysis, FTIR, XPS, X-ray diffraction, Mössbauer and magnetic measurements. Excessive amount of FeSO4 used during the preparation of complexes not only destroys the crystallinity of the polymer, but also introduces more magnetic impurities (Fe3O4) into complexes. Increasing acidity of reaction medium during the preparation of complexes was an effective method to prevent the formation of magnetic impurities in complexes. Our results provided a direct experimental evidence to demonstrate that the ferromagnetic properties of PPH-FeSO4 complexes observed at room temperature are due to the presence of magnetic impurities arising from preparation processes of complexes.
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