Preparation, crystallization behavior and magnetic properties of nanoparticles magnetic glass–ceramics in the systems Fe2O3 CoO MnO2, Fe2O3 NiO MoO3 and Fe2O3 CoO V2O5

Ferrimagnetic glass–ceramics were prepared in the systems Fe2O3 CoO MnO2 (S1), Fe2O3 NiO MoO3 (S2) and Fe2O3 CoO V2O5 (S3). Small amount of H3BO4 was added to make the melting process easier. The samples were characterized using DTA, XRD, TEM and EDX. Sequence of crystallization was studied by applying heat-treatment at 800 and 1000 °C for 4 h. CoFe2O4 with crystallite sizes of ≈ 14–20 nm was successfully prepared beside FeCoOBO3 and Co3BO5 in S1. NiMoO4, (FeNi2)O2(BO3) and NiO with crystallite size ≈ 56–79 nm were crystallized in S2. CoFe2O4, FeCoOBO3 and Co3BO5 with crystallite size ≈ 6–8 nm were crystallized in S3. Magnetic hysteresis cycles were analyzed with a maximum applied field of 20 kOe at room temperature. From the obtained hysteresis loops Ms records higher values for S1 and S3 and lower value for S2, while coercivity reach maximum for S2. The variable, magnetic, data range gives a wide range for different applications.