Abstract
Abstract Differential thermal analysis, X-ray diffractometry and scanning electron microscopy with energy dispersive spectroscopy were used to study the crystallisation of a glass with a composition of 45% BaO, 30% B 2 O 3 and 25% Fe 2 O 3 (mol%), to which 10–30% SiO 2 was added replacing B 2 O 3 . The effect of 1 mol% Cr 2 O 3 as a nucleation agent also was studied. The magnetic properties of some specimens also were measured with a vibrating sample magnometer. It was found that while the addition of >10 mol% SiO 2 prevented formation of barium hexaferrite, the main magnetic phase, Cr 2 O 3 , greatly enhanced surface crystallisation. All specimens revealed glass in-glass phase separation, which in the presence of Cr 2 O 3 was more extensive and on a much finer scale. The latter specimens, in the form of pressed glass frits heat treated 1 h at 723 °C, showed a coercive force of H c =4150 Oe and saturation magnetisation of M s =9.92 emu/g.
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