Journal of Materials Science

, Volume 42, Issue 1, pp 50–58 | Cite as

Microstructure and stresses in a keatite solid–solution glass–ceramic



The microstructure of a translucent keatite solid–solution glass–ceramic (keatite s.s.) of the LAS-system (Li2O–Al2O3–SiO2) has been analyzed with SEM, AFM, XRF, XRD, and TEM. The glass–ceramic consists mainly of keatite s.s. with minor secondary phases such as zirconium titanate, gahnite and probably rutile. Furthermore the resistance to temperature differences (RTD) of this glass–ceramic was investigated. It is shown that, in spite of the relatively high coefficient of thermal expansion (CTE) of about 1 × 10−6 K−1, an improved RTD can be achieved by special ceramization treatment. With this, compressive stresses in the first 100 μm to 150 μm are induced. These stresses can presumably be contributed to a difference in CTE between the surface-near zone and the bulk. Said CTE difference is caused by chemical gradients of CTE-relevant elements, such as Zn, K, and supposedly additional alkali elements such as Li. These stresses are useful to increase the strength and application range of glass–ceramics based on keatite s.s.


Fracture Toughness Crack Length Glassy Phase Zirconium Titanate Chemical Gradient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.







Coefficient of Thermal Expansion


Resistance to Temperature Differences




Scanning-Electron Microscopy


Transmission Electron Microscopy


Energy Dispersive X-ray Spectroscopy


X-ray Fluorescence Analysis


X-ray Diffraction


Residual-Stress X-ray Diffraction


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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Christian Roos
    • 1
  • Otmar Becker
    • 1
  • Friedrich Siebers
    • 1
  1. 1.Corporate Research and Technology DevelopmentSCHOTT AGMainzGermany

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