Abstract
Glasses with the compositions (100 − x)(0.16Na 2O/0.10MnO/0.74SiO 2)/ xFe 2O 3, ( x = 5–30) and 16Na 2O/10MnO/(74 − y)SiO 2/ yFe 2O 3 ( y = 5–30) were studied using X-ray diffraction and scanning electron microscopy. The effect of the chemical composition and the thermal history on the phase formation and the resulting microstructure was investigated. During cooling, the precipitation of ferrimagnetic solid solutions Fe 3O 4/Mn 3O 4 was observed. These crystals show dendritic or platelet shape, whereby the platelets are ferromagnetic and the dendrites – mainly paramagnetic. The tendency towards crystallization can be suppressed by increasing the Na 2O-concentration. In contrast to glasses without manganese oxide, the precipitation of hematite is not observed. Therefore, the addition of reducing agents is not required, in order to crystallize large volume concentrations of the ferrimagnetic phase.
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