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Abstract : |
A homogeneous glass with composition 0.60SiO(2)-0.3Na(2)O-0.10Fe(2)O(3) was prepared and devitrified to produce a glass ceramic having a single crystalline phase of formula Na5Fe(SiO3)(4). The de magnetic susceptibility measurements performed on the glass and the heat-treated sample have shown that the magnetic exchange interaction is antiferromagnetic and of equal strength in both samples investigated. It was shown that M versus H data at different temperatures do not collapse to a single curve in the M versus H/T representation for both the glass and the heat-treated sample, further indicating an antiferromagnetic interaction in both materials. The M versus H data for the glass sample was fitted with Brillouin function by keeping the total number of magnetic ions constant and varying the proportion of ferrous ions until a best fit was achieved. The [Fe2+]/[Fe-total] concentration ratio obtained fr um the fit is in good agreement with the value obtained from X-ray photoelectron spectroscopy (XPS) performed on the glass sample., |
