Abstract
The structural effects caused by transition metal oxides (TMO) added to calcium–sodium–phosphate glasses are investigated with respect to the local order up to atomic environment using differential thermal analysis (DTA) and X-ray photoeffect spectroscopy (XPS). Reference data are collected from 50P 2O 5·30CaO·20Na 2O host glass. Different influences of TMO on the crystallisation temperature and glass stability are observed if Ag 2O or Fe 2O 3 is added to the host glass. The melting temperature is diminished by Ag 2O and is enhanced by Fe 2O 3. The data point out higher values for glass stability of iron containing glasses. XPS data support that in this glass system the oxidation state of iron ions is 3+ and Fe 2O 3 acts as a glass network former. By TMO addition the valence band of the host glass is shifted from 2.6 eV to negative values of the binding energy.
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