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  • 1 Institute of Physics and Technology of Materials P.O. Box MG 07 R-76900 Bucharest (Romania)
  • | 2 Institute of Atomic Physics P. O. Box MG 06 R-76900 Bucharest (Romania)
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Abstract  

Different iron hydroxide precipitation processes simulating radioactive waste, treatment have been investigated by Mössbauer spectroscopy at room temperature and at 80 K. Magnetic oxides (hematite or magnetite) partially affected by superparamagnetic relaxation have been observed. The crystallization degree and the particle size depend on the concentration and the addition order of chemicals. Much smaller particles were precipitated with Ca(OH)2 than with NaOH as neutralization reagent.