Nucleation and Growth of Nanocrystals in Glass‐Ceramics: An In Situ
We studied the nucleation and growth of nano‐sized crystals on two glass‐ceramic systems: a conventional lithium‐aluminosilicate (
LAS) and a ( g, M n) spinel.
We combined several techniques: in situ Small Angle Neutron Scattering ( Z SANS), Differential Scanning Calorimetry ( DSC), Scanning Electron Microscopy ( SEM), and laboratory X‐ray diffraction ( XRD).
We observed by SANS, and confirmed by DSC, that during a temperature ramp, transient phenomena occur between the regions of nucleation and growth in the LAS, which do not follow classic kinetic theories. In contrast, the spinel
material shows a smooth transition during the temperature ramp between the nucleation and the growth stages, and follows a more conventional growth pattern. In the spinel system the initial phase separation plays a very important role in determining the crystalline phase distribution in the
glassy matrix, as crystallites are confined only in one phase.
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Document Type: Research Article
Publication date: April 1, 2012