magnetite, glass-ceramics, AC susceptibility, magnetic relaxation, nucleating agent
The specific dynamic magnetic response and magnetic relaxation phenomena in magnetite-based glass-ceramics by controlled crystallization of Fe-rich borosilicate glasses with 25 wt% Fe2O3, in the presence of two types of nucleating agents, Cr2O3 and P2O5, were investigated. The magnetic response is complex and shows contributions arising from two subsystems: a system with collective characteristics, superspin-glass like, and another one with single particle characteristics (superparamagnetic) with dipolar interaction. The nucleating agents have strong influence on the characteristic temperatures and anisotropy energy.
Tsinghua University Press
V. SANDU, E. CIMPOIASU, A. KUNCSER et al. Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses. Journal of Advanced Ceramics 2017, 6(3): 251-261.