Neutron diffraction from levitated liquids – a technique for measurements under extreme conditions

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In this Subject: <a title="Inorganic Chemistry" href="/content/subcat?j_subject=167&j_availability=">Inorganic Chemistry
By this author: Weber, J.K.R. ;&nbsp; Rix, J.E. ;&nbsp; Hiera, K.J. ;&nbsp; Tangeman, J.A. ;&nbsp; Benmore, C.J. ;&nbsp; Hart, R.T. ;&nbsp; Siewenie, J.E. ;&nbsp; Santodonato, L.J.

Authors: Weber, J.K.R.; Rix, J.E.; Hiera, K.J.; Tangeman, J.A.; Benmore, C.J.; Hart, R.T.; Siewenie, J.E.; Santodonato, L.J.

Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 46, Number 4, August 2005 , pp. 487-491(5)

Publisher: Society of Glass Technology

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Abstract:

A miniature aerodynamic levitation device was integrated with CO₂ laser beam heating and a pulsed neutron source. Liquid and solid oxide samples were studied at temperatures from 300–3300 K. The total neutron structure factors, S_N(Q), were obtained for 64:36 mol % CaO:Al₂O₃– composition liquid at ca. 2000 K, YAG at 300–2300 K and ZrO₂ at 300–3300 K. The pair distribution functions were derived from S(Q). In the CA liquid, the Al and Ca ions were in higher coordination with oxygen than in the corresponding glasses. The thermal expansion coefficient of crystalline YAG was calculated to be 10×10⁻⁶/K in the temperature interval 300–1800 K from refined data. The average metal ion coordination in YAG composition glass was lower than in the equilibrium crystalline YAG phase. The garnet phase was stable to a temperature of at least 1800 K and marked differences in connectivity and coordination were observed between a YAG-composition glass and the hot crystalline solid. The ZrO₂ showed three crystalline polymorphs when it was heated. The density of the ZrO₂ solid increased at ca. 3000 K, slightly below the melting point.

Document Type: Research article

Publication date: 2005-08-01