Structure of Normal and Supercooled Liquid Aluminum Oxide

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• 作者：Shankar Krishnan ; Louis Hennet ; Sandro Jahn ; Thomas A. Key ; Paul A. Madden ; Marie-Louise Saboungi ; and David L. Price
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：May 17, 2005
• 年：2005
• 卷：17
• 期：10
• 页码：2662 - 2666
• 全文大小：115K
• 年卷期：v.17,no.10(May 17, 2005)
• ISSN：1520-5002

文摘

We have made a new determination of the structure of liquid aluminum oxide over a wide temperaturerange, including the supercooled region, using synchrotron X-ray diffraction. Measurements were performedover a wide scattering vector range, 0.5-16 Å^-1. Specimens of aluminum oxide were aerodynamicallylevitated and laser-heated to temperatures in excess of the melting temperature of 2327 K. Diffractionmeasurements were performed in a temperature range of 2000-2600 K, which included the supercooledliquid state. Measurements performed in argon (reducing) and oxygen (oxidizing) atmospheres showlittle structural difference, in contrast to reported differences in optical properties. The X-ray results arein excellent agreement with those of a molecular dynamics simulation performed with an ab initiointeraction potential.