Phase transition and thermal expansion coefficient of leucite ceramics with addition of SiO2

Autor:	Shimako Naito, Ayako Uozumi, Yoshiaki Kinemuchi, J.P. Wiff, Koji Watari
Rok vydání:	2009
Předmět:	Diffraction Phase transition Work (thermodynamics) Materials science Mechanical Engineering TEC Analytical chemistry Condensed Matter Physics Thermal expansion Mechanics of Materials Phase (matter) visual_art visual_art.visual_art_medium General Materials Science Ceramic Leucite
Zdroj:	Journal of Materials Research. 24:1989-1993
ISSN:	2044-5326 0884-2914
Popis:	In this work, the influence of SiO2 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 SiO2-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-SiO2-added samples, whereas during the phase transition, a maximum TEC value was observed and it tends to decrease as the SiO2 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 SiO2 addition, the cubic phase can be partially stabilized at temperatures as low as 200 °C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6c3544232ac90557954c208be2330f0d https://doi.org/10.1557/jmr.2009.0241 Zobrazit plný text záznamu Full text from SpringerLink