Magnetic glass-ceramics produced from wastes

Reference Presenter Authors
(Institution)
Abstract
08-024 Tales Goncalves Avancini Avancini, T.G.(Universidade Federal do Rio Grande do Sul); Alves, A.K.(Universidade Federal do Rio Grande do Sul); Arcaro, S.(Universidade Federal do Rio Grande do Sul); Novaes de Oliveira, A.P.(Universidade Federal de Santa Catarina); Souza, M.T.(Universidade Federal de Santa Catarina); In this work, we discuss the development of magnetic glass-ceramics based on recycled borosilicate glass and scale (a by-product from metallurgical industry). Raw materials were initially milled (d 50 < 5 ?m) and characterized by X-ray fluorescence, laser scattering particle sizing, X-ray diffraction and dilatometry. Different compositions were established with increasing contents of scale (10 – 25 vol.%) in the samples. Raw materials were melted (1550 °C/4h) and later cast in a preheated steel mold at 400 °C. Then, samples were annealed at 700 ºC/30 min. The obtained glass-ceramics were investigated by X-ray diffraction (DRX), differential scanning calorimetric (DSC), vibrating-sample magnetometer (VSM), Mössbauer spectroscopy and transmission electron microscopy (TEM). Magnetite nanocrystals (average size in the 40 and 60 nm range) in the glass- ceramics were evidenced by TEM images and Mössbauer spectrum. VSM analysis revealed that the obtained ferrimagnetic glass–ceramic in the composition with 25 vol.% of scale improved the magnetization saturation (Ms), reaching 28.5 emu/g. Results indicate a great potential for these magnetic glass-ceramics for many applications, such as in storage devices, magnetic resonance imaging contrasting agents, magnetic hyperthermia, drug delivery biodetection, waste sorbent and microwave devices.
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