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

Abstract Ferrimagnetic glass–ceramics were prepared in the systems Fe 2 O 3 CoO MnO 2 (S1), Fe 2 O 3 NiO MoO 3 (S2) and Fe 2 O 3 CoO V 2 O 5 (S3). Small amount of H 3 BO 4 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. CoFe 2 O 4 with crystallite sizes of ≈ 14–20 nm was successfully prepared beside FeCoOBO 3 and Co 3 BO 5 in S1. NiMoO 4 , (FeNi 2 )O 2 (BO 3 ) and NiO with crystallite size ≈ 56–79 nm were crystallized in S2. CoFe 2 O 4 , FeCoOBO 3 and Co 3 BO 5 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.