Abstract
Hypotheses concerning possible crystallization mechanisms in nanocrystal-bearing MgO–Al2O3–SiO2–ZrO2 glass-ceramics, analyzed with XRD and analytical TEM techniques, are discussed.
Highlights
In the absence of nucleating agents, glass-ceramics derived from MgO/Al2O3/SiO2 parent glasses usually evolve due to surface crystallization upon heat treatment
It was studied with respect to its surface crystallization behaviour, mainly due to its potential applications as sintered glass-ceramics, e.g. for use as substrate material in electronics
According to XRD, the parent glass sample, as well as the samples heat treated for t < 3 h, show no indication for the precipitation of crystalline phases
Summary
In the absence of nucleating agents, glass-ceramics derived from MgO/Al2O3/SiO2 parent glasses usually evolve due to surface crystallization upon heat treatment. The addition of nucleating agents such as TiO2,1–3 ZrO2,3–5 or a mixture of both,[6,7,8] may lead to bulk nucleation. For two reasons, this glass system has frequently been investigated. It was studied with respect to its surface crystallization behaviour, mainly due to its potential applications as sintered glass-ceramics, e.g. for use as substrate material in electronics. In the past few years, especially two potential applications were reported for glass-ceramics based on the system MgO/Al2O3/SiO2: as substrate for hard discs[9] and as material for restorative dentistry.[10]
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