Abstract
Mössbauer spectroscopic study was performed to investigate the formation of non-bridging oxygen in the potassium borate glasses denoted by the formula of x K 2O(100 − x) B 2O 3 · 7 Fe 2O 3 (0 ⩽ x ⩽ 40 mol%). In the range of alkali content higher than 20 mol%, the quadrupole splitting for Fe 3+ decreased continuously with the concentration of the alkali oxide in the glass, showing the increase of the symmetry around the Fe 3+ ions. The isomer shift value also decreased in almost the same x region. The drastic decrease of Mössbauer parameters was attributed to the formation of non-bridging oxygen at the adjacent site of the Fe 3+ ions. In the region of lower alkali content (less than 10 mol%), Mössbauer spectra only showed the absorption due to α-Fe 2O 3. X-ray powder diffraction patterns also displayed the existence of α-Fe 2O 3, together with the microcrystal of potassium borate.
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