In situ Diamond Anvil Cell–Raman Spectroscopy and Nanoindentation Study of the Pressure‐Induced Phase Transformation in Pure and Zinc‐Doped β‐Eucryptite. Issue 6 (28th February 2013)

• Record Type: Journal Article
• Authors: Ramalingam, Subramanian; Packard, Corinne E.; Reimanis, Ivar E.; Pharr, G.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 6(2013)
• Page Start: 1909
• Page End: 1915
• Publication Date: 2013-02-28
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12220
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" xml:lang="en" id="jace12220-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>β‐eucryptite (LiAlSiO₄), a member of the family of lithium aluminum silicates, is known to undergo a reversible pressure‐induced phase transformation at ~0.8 GPa to ε‐eucryptite. This study correlates the results between two techniques, <italic>in situ</italic> diamond anvil cell–Raman spectroscopy and nanoindentation experiments, to explore how doping (substituting Zn for Li) influences this pressure‐induced phase transformation. Diamond anvil cell tests carried up to 3 GPa hydrostatic stress under Raman spectroscopy were compared with nanoindentation results, which provide a more localized, multiaxial stress state. The results indicate that the magnitude of hysteresis observed (difference between the pressures required for the forward and reverse transformation) is lower for Zn‐doped β‐eucryptite; however, the onset of the phase transformation is unchanged by doping with Zn. Furthermore, calculations of activation volume from nanoindentation experiments yield similar values (~0.1 nm³) for pure and Zn‐doped β‐eucryptite, suggesting that the nucleation event that establishes the onset of the phase transformation is the same for both materials.</p> </abstract>