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High and Low Temperature Forms of Leucite

  • L. Hermansson
  • R. Carlsson

Abstract

Phase transitions of leucite and solid solutions of leucite, obtained by crystallization of glasses in the K2O-CaO-Al2O3-Si02 system, have been investigated by means of high temperature X-ray diffraction and DTA.

The unit cell dimensions of leucite (a=13.08 Å, c=13.75 Å) change continuously with temperature up to the transition between the tetragonal and the cubic form at approximately 625°C, where a discontinuous change is observed. Solid solutions of the low temperature form of leucite (a=13.12=13.15 Å, c=13.69=13.74 Å) showed the same transition behaviour. The discontinuous change, however. occurred at a lower temperature, in one case as low as 300°C. For two samples a temperature interval of approximately 100°C occurred within which low and high leucite co-existed.

Two samples yielded the cubic form of leucite at room temperature (a=13.43 Å). The linear thermal expansion ooeffi-cient of high leucite was determined to be (11.7=12.8) 10-6(C-1)(25-600°C).

Keywords

Solid Solution Phase Transition Temperature Temperature Form Transition Behaviour Linear Thermal Expansion 
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.

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Copyright information

© Springer Science+Business Media New York 1977

Authors and Affiliations

  • L. Hermansson
    • 1
  • R. Carlsson
    • 1
  1. 1.Swedish Institute for Silicate ResearchGothenburgSweden

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