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  4. ZrTiO(4) crystallisation in nanosized liquid-liquid phase-separation droplets in glass - a quantitative XANES study
 
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2011
Journal Article
Title

ZrTiO(4) crystallisation in nanosized liquid-liquid phase-separation droplets in glass - a quantitative XANES study

Abstract
The crystallisation of the nucleation agent ZrTiO(4) in a low thermal-expansion lithium aluminosilicate glass-ceramics is monitored as a function of time by combining transmission electron microscopy with Ti-L(2,3) X-ray absorption near-edge structure spectroscopy. The formation of liquid-liquid phase-separation droplets is shown to precede ZrTiO(4) crystallisation within the latter nanosized droplets. Quantitative data on crystalline fractions enable conclusions on the self-limited growth of ZrTiO(4) nanocrystals in low thermal-expansion glass-ceramics and based on Avrami's equation, the growth is shown to be restricted by a barrier (the outer border of the phase-separation droplet). It is shown that liquid-liquid phase separation and crystallisation are temporally decoupled. The size of ZrTiO(4) crystallites is determined by the restricted volume of the phase-separation droplets they crystallise in. The volume of the droplets in turn is restricted by the formation of a diffusion barrier in the surrounding residual glass.
Author(s)
Höche, T.
Mäder, M.
Bhattacharyya, S.
Henderson, G.S.
Gemming, T.
Wurth, R.
Rüssel, C.
Avramov, I.
Journal
CrystEngComm  
DOI
10.1039/c0ce00716a
Language
English
IWM-H  
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