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

CrystEngComm, ISSN: 1466-8033, Vol: 13, Issue: 7, Page: 2550-2556
2011
  • 64
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  • 31
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Metrics Details

  • Citations
    64
    • Citation Indexes
      64
  • Captures
    31

Article Description

The crystallisation of the nucleation agent ZrTiO in a low thermal-expansion lithium aluminosilicate glass-ceramics is monitored as a function of time by combining transmission electron microscopy with Ti-L X-ray absorption near-edge structure spectroscopy. The formation of liquid-liquid phase-separation droplets is shown to precede ZrTiO crystallisation within the latter nanosized droplets. Quantitative data on crystalline fractions enable conclusions on the self-limited growth of ZrTiO 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 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. © 2011 The Royal Society of Chemistry.

Bibliographic Details

Thomas Höche; Marisa Mäder; Somnath Bhattacharyya; Grant S. Henderson; Thomas Gemming; Roman Wurth; Christian Rüssel; Isak Avramov

Royal Society of Chemistry (RSC)

Chemistry; Materials Science; Physics and Astronomy

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