Phase transition and thermal expansion coefficient of leucite ceramics with addition of SiO 2

In this work, the influence of SiO 2 additions in leucite ceramics on the bulk linear thermal expansion coefficient (TEC) especially during the phase transition, has been studied. Thermal expansion and x-ray diffraction measurements at high temperatures were carried out to characterize the tetragona...

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Bibliographic Details
Published in:Journal of materials research 2009-06, Vol.24 (6), p.1989-1993
Main Authors: Wiff, Juan Paulo, Kinemuchi, Yoshiaki, Naito, Shimako, Uozumi, Ayako, Watari, Koji
Format: Article
Language:English
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Summary:In this work, the influence of SiO 2 additions in leucite ceramics on the bulk linear thermal expansion coefficient (TEC) especially during the phase transition, has been studied. Thermal expansion and x-ray diffraction measurements at high temperatures were carried out to characterize the tetragonal-cubic phase transition. TEC for reference and SiO 2 -added leucite samples exhibited similar behavior as a function of temperature. Before and after the phase transition, the TEC values were similar to those observed in non-SiO 2 -added samples, whereas during the phase transition, a maximum TEC value was observed and it tends to decrease as the SiO 2 addition increases. This behavior could be caused by the formation of an intermediate phase with an extremely high TEC (70 × 10 –6 °C −1 ) during the phase transformation. Furthermore, the results suggest that as the intermediate phase is partially suppressed via SiO 2 addition, the cubic phase can be partially stabilized at temperatures as low as 200 °C.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2009.0241