Neutron diffraction study of frozen Fe(ClO4)2 solutions

Gy Mészáros, L. Almásy, E. Sváb, L. Cser, I. Dézsi

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Abstract

Neutron diffraction measurements were performed on rapidly quenched aqueous solution of ferrous-perchlorate of different concentrations. D2O was used as solvent and the crystal water of Fe(ClO4)2. 6H2O was partly substituted by heavy water, in order to avoid the high incoherent scattering of hydrogen. After fast-freezing, the formation of hexagonal ice and an amorphous phase was observed for concentrations of 1.6 and 3.2 mol%, while for the 6.5 mol% concentration, the formation of a pure amorphous phase was obtained. Phase transitions were observed and analysed after heating the frozen samples in the temperature range of -160°C and -25°C with various heating rates. Starting from the amorphous state, formation of a viscous phase, thereafter at higher temperatures the formation of hexagonal ice and crystalline structures were observed. Different crystalline structures were obtained by heating the fast-frozen samples at high or low heating rates.

Original languageEnglish
Pages (from-to)732-737
Number of pages6
JournalMaterials Science Forum
Volume278-281
Issue numberPART 2
Publication statusPublished - Dec 1 1998

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Keywords

  • Amorphous
  • Crystallisation
  • Fast-Frozen
  • Ferrous-Perchlorate
  • Neutron Diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Mészáros, G., Almásy, L., Sváb, E., Cser, L., & Dézsi, I. (1998). Neutron diffraction study of frozen Fe(ClO4)2 solutions. Materials Science Forum, 278-281(PART 2), 732-737.