Mössbauer effect and thermal analysis of frozen ferrous perchlorate solutions. I

Abstract

Aqueous Fe(Cl04)2 · 6H2O solutions of different concentrations were quickly frozen to liquid nitrogen temperature and the zero-velocity Mössbauer transmission and differential thermoanalytical curves were measured simultaneously as the samples warmed up. The solutions segregated into two phases: one consisting of pure water (phase I), the other composed of ferrous perchlorate molecules and water molecules together (phase II). Phase II was a glasslike material which, above the glass transition temperature, behaved like a supercooled liquid and recrystallized near −80°C. The concentration dependence of the recrystallization was measured.