In-situ synchrotron x-ray study of phase transitions in melamine under high pressures and high temperatures

被引：5
|
作者：
Pravica, Michael [1 ,2 ]
Galley, Martin [1 ,2 ]
Park, Changyong [3 ]
Ruiz, Harrison [1 ,2 ]
Wojno, Jennifer [1 ,2 ]
机构：
[1] UNLV, HiPSEC, Las Vegas, NV 89154 USA
[2] UNLV, Dept Phys, Las Vegas, NV 89154 USA
[3] Carnegie Inst Washington, Geophys Lab, HPCAT, Argonne, IL 60437 USA
来源：
DIAMOND AND RELATED MATERIALS | 2011年 / 20卷 / 07期
基金：
美国国家科学基金会;
关键词：
Paris-Edinburgh cell; Synchrotron radiation; X-ray; High pressure; Melamine; EDXRD; PARIS-EDINBURGH CELL;
D O I：
10.1016/j.diamond.2011.04.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report a synchrotron energy-dispersive x-ray diffraction study of melamine at high pressure and high temperature. Pressure was generated using a Paris-Edinburgh cell to employ larger sample volumes for weakly scattering organic samples. High temperatures were created using a resistive/graphitic cup surrounding the sample. The PT phase diagram was explored by first pressurizing the sample to 3.5 GPa at room temperature and then heating it up to 1197 K with a concomitant pressure increase to just above 5 GPa. Above 4.85 GPa and 967 K, an irreversible phase transition was observed. Upon cooling the sample, another phase transition was observed which is likely associated with polymerization observed in earlier ex-situ HPHT experiments. (C) 2011 Elsevier B.V. All rights reserved.
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页码：1090 / 1092
页数：3
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