Magnetite nanoparticles prepared by the crystallization of Na2O-Fe2O3-B2O3-SiO2 glasses

作者：Amirahmadi Z; Marghussian V K^*; Beitollahi A; Mirkazemi S M; Sarpoolaky H

来源：Journal of Non-Crystalline Solids, 2011, 357(16-17): 3195-3199.

DOI：10.1016/j.jnoncrysol.2011.03.045

• Magnetite
• Magnetic properties
• Nanoparticles
• Glass ceramics
• Glass crystallization

A glass with the composition of 35Na(2)O-24Fe(2)O(3)-20B(2)O(3)-20SiO(2)-1ZnO (mol%) was melted, quenched, using a twin roller technique, and subsequently heat treated in the range 485-750 degrees C for 1-2 h. This led to the crystallization of magnetite as the sole or the major crystalline phase.
Heat treatment at lower temperatures resulted in the crystallization of magnetite crystals 7-20 nm in diameter, whereas heat treatment at higher temperatures produced higher quantities of magnetite and much larger crystals. The room temperature magnetization and coercive force values were in the range of 6-57 emu g(-1) and 0-120 Oe. respectively for the heat treated glasses.

• 出版日期2011-8