Polyvalent elements iron, tin and titanium in silicate, phosphate and fluoride glasses and melts

Polyvalent elements iron, tin and titanium were investigated in five differ ent types of glass forming melts. The relationships between local glass str ucture and spectroscopic properties of doped polyvalent elements it,ere of interest. Three different silicate types (mol%) (33Na(2)0.67SiO(2), 15N(a)2 0.85SiO(2) and 10Ba0.10CaO. 15Al(2)O(3).65SiO(2)), one metaphosphate (33NaP O(3).67Sr(PO3)(2)) and one fluoride type (35AlF(3).15SrF(2). 30CaF(2).10Sr( PO3)(2)) doped with Fe2O3, SnO and TiO2 were melted under various condition s equilibrated in a ii,ide temperature range (900- 2000 degreesC). The shif t of the redox states of iron, tin and titanium were studied by square ii,a ve voltammetry in the melts, optical absorption and luminescence, electron Spill resonance and Sn-119-Mossbauer spectroscopy in the glass samples. The redox states and spectroscopic data are strongly influenced by the local g lass Structure and melting conditions.