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Nucleation and Growth of Nanocrystals in Glass‐Ceramics: An In Situ SANS Perspective
Author(s) -
FernandezMartin Cristina,
Bruno Giovanni,
Crochet Anne,
Ovono Ovono Delavand,
Comte Monique,
Hennet Louis
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05093.x
Subject(s) - nucleation , differential scanning calorimetry , materials science , spinel , crystallite , neutron diffraction , mineralogy , neutron scattering , nanocrystal , scanning electron microscope , phase (matter) , aluminosilicate , crystallography , chemical engineering , analytical chemistry (journal) , scattering , thermodynamics , nanotechnology , chemistry , optics , composite material , crystal structure , metallurgy , physics , organic chemistry , engineering , chromatography , biochemistry , catalysis
We studied the nucleation and growth of nano‐sized crystals on two glass‐ceramic systems: a conventional lithium‐aluminosilicate ( LAS ) and a ( M g, Z n) spinel. We combined several techniques: in situ Small Angle Neutron Scattering ( 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.