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Spontaneous Ejecta From [Beta]-Eucryptite Composites



Ivar E. Reimanis, C Seick, K Fitzpatrick, Lin-Sien H. Lum, S Landin


Polycrystalline ceramic composites, comprised of primarily b-eucryptite (LiAlSiO4) and lithium aluminate (LiAl5O8) crystals, with a near-zero coefficient of thermal expansion were examined with indentation experiments. A unique behavior is reported: subsequent to the indentation, the material responds by ejecting multiple particles violently from the area of the indent for a time period up to several minutes. The behavior is suppressed in the absence of moisture. An estimate of the source of energy for this process and a potential mechanism are discussed.
Journal of the American Ceramic Society


composites, ejecta, eucryptite, microcracking, misfil strains, thermal expansion anisotropy, transformation


Reimanis, I. , Seick, C. , Fitzpatrick, K. , Lum, L. and Landin, S. (2017), Spontaneous Ejecta From [Beta]-Eucryptite Composites, Journal of the American Ceramic Society (Accessed December 9, 2023)
Created February 19, 2017