Effect of P(2)O(5) and MnO(2) on crystallization of magnetic glass ceramics

This work pointed out the effect of adding P(2)O(5) and/or MnO(2) on the crystallization behavior of magnetic glass ceramic in the system Fe(2)O(3)·ZnO·CaO·SiO(2)·B(2)O(3). The differential thermal analysis of the quenched samples revealed decrease in the thermal effects by adding P(2)O(5) and/or MnO(2) to the base sample. The X-ray diffraction patterns show the development of nanometric magnetite crystals in a glassy matrix. Heat treatment at 800 °C for 2 h, under reducing atmosphere, caused an increase in the amount of the crystallized magnetite with the appearance of minor hematite and Ca(2)SiO(4). The transmission electron microscope revealed a crystallite size in the range 10–30 nm. Magnetic hysteresis cycles were analyzed with a maximum applied field of 25 kOe at room temperature. The prepared magnetic glass ceramics are expected to be useful for localized treatment of cancer.