Tellurite And Fluorotellurite Glasses For Active And Passive

2. Literature review; MDO 28
the addition of ZnO, structural units change from [TeO4] tbp to [TeO3] tp via [TeO3+1]
polyhedra, as shown by fig. (2.3).
Weak Te-O in
pure α-TeO2
which may
prevent glass
formation
Fig. (2.3): Structural units in TeO2-ZnO glasses: (a) [TeO4] tbp, (b) [TeO3+1] polyhedra,
(c) [TeO3] tp, and (d) [TeO6] in α-TeO2 [23]
Zinc atoms in the glass occupy [ZnO6] sites as in Zn2Te3O8, and [ZnO5] as in ZnTeO3,
but not tetrahedral [ZnO4] sites as in ZnO [23].