Sublattice magnetizations in lithium ferrite as a function of temperature

Abstract

Neutron diffraction measurements have been made of the intensities of the 111 and 331 reflections of lithium ferrite at temperatures ranging from 4 °K up to the Curie point, about 900 °K. Combined with magnetization data, these observations yield values for the degrees of magnetic saturation of the ions on the tetrahedral and octahedral sites individually. Comparison of these magnetization values with those calculated from the molecular field theory show that the experimental values are significantly higher than the calculated values at temperatures between 0.4 Tc and Tc. Calculations using different values of the molecular field parameters do not lead to significantly better agreement with experiment