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Oxyfluoride nucleating crystals in fluorozirco-hafnate glasses
Ist Teil von
Materials letters, 1990-11, Vol.10 (4), p.181-186
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
1990
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
The effect of Al
2O
3 on the thermal stability of a fluorozirco-hafnate glass was investigated using X-ray diffractometry, optical microscopy and scanning/transmission electron microscopy. While the as-quenched glasses were crystal-free, subsequent heat treatment at 355°C for 10 min led to crystallization in the oxide-doped glasses. However, the oxide-free glass did not exhibit crystallization on heat treatment. EDX and EELS analysis of the heat-treated samples revealed that the crystals were nucleated by an oxyfluoride phase of the type, Hf
a
Zr
b
O
c
F
d
.