A Study of the Low Temperature Transition in Magnetite

摘要: A study of the low temperature transition in magnetite has been performed by Mossbauer absorption using both an isotopic enriched sample and a single crystal. At room two different hyperfine fields 495±20 kOe 470±20 were observed, their intensity ratio was about one to two. Below temperature, 510±20 470 -20 +30 observed providing ferric ferrous ions octahedral sites be separately ordered. An electric quadrupole interaction isomer shift for carefully measured as -1.9±0.2 mm/sec 0.88±0.15 mm/sec, respectively, at 85°K. These values are little smaller than those ordinary compounds. weak peak which could not identified. dependence spectra also region. It is suggested that phenomena described paper superposed this temperatur...