ESR study of NiFe2O4 precipitation process from silicate glasses

Abstract

The precipitation process of nickel ferrite (NiFe₂O₄) from silicate glasses has been studied by electron spin resonance (ESR). The ESR linewidth ΔH_1/2 and effective g value were measured as functions of heat‐treatment temperature and time. Both the linewidth and effective g value change drastically near the glass transition temperature and precipitation temperature. The results are interpreted on the basis of the development of ion ordering, i.e., magnetic‐order development, that occurs during the heat treatments.