Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

• Main Authors: V. Sandu, E. Cimpoiasu, A. Kuncser, M. S. Nicolescu
• Format: Article
• Language: English
• Published: SpringerOpen 2017-09-01
• Series: Journal of Advanced Ceramics
• Subjects: magnetite; glass-ceramics; AC susceptibility; magnetic relaxation; nucleating agent
• Online Access: http://link.springer.com/article/10.1007/s40145-017-0236-2

Abstract 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.