A. Mohammadpour, S. M. Mirkazemi, A. Beitollahi,
Volume 12, Issue 3 (9-2015)
Abstract
In the present study, the feasibility of α-Fe ferromagnetic phase formation in glass and glass-ceramic by
reduction in hydrogen atmosphere have been investigated. The glass with the composition of 35Na
2
O–24Fe2O3–20B
2O3
–
20SiO
2
–1ZnO (mol %) was melted and quenched by using a twin roller technique. As quenched glass flakes were heat
treated in the range of 400-675 °C for 1-2 h in hydrogen atmosphere, which resulted in reduction of iron cations to α-Fe
and FeO. The reduction of iron cations in glass was not completely occurred. Saturation magnetization of these samples
was 8-37 emu g -1
. For the formation of glass ceramic, As quenched glass flakes heat treated at 590 °C for 1 h. Heat
treatment of glass ceramic containing magnetite at 675°C in hydrogen atmosphere for 1 h led to reduction of almost all of
the iron cations to α-Fe. Saturation magnetization of this sample increased from 19.8 emu g
-1
for glass ceramic to 67 emu
g
-1
