| Ammonia borane at high pressures |
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| 作者姓名： | Jiuhua Chen Vadym Drozd Yongzhou Sun Shah Najiba |
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| 作者单位： | Center for High Pressure Science and Technology Advanced Research, Jilin University;Center for the Study of Matter at Extreme Conditions,Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33199, USA |
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| 基金项目： | supported by the US Department of Energy,Office of Science,Office of Basic Energy Sciences(DEFG02-07ER46461);Jiuhua Chen acknowledges part of student support from EFree,an Energy Frontier Research Center funded by DOE-BES(DE-SC000105) |
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| 摘 要： | Ammonia borane has received tremendous research attention in the past decade because of its potential for chemical hydrogen storage. This paper reviews recent studies about the behavior of ammonia borane at high pressures. While much work is still needed to comprehensively understand the pressure influence on this molecular crystal, a phase diagram based on the available experimental and theoretical data is constructed. Raman spectroscopy studies indicate five transitions upon compression up to 65 GPa at ambient temperature. Diffraction experiments and theoretical studies demonstrate that three of these transitions are first-order phase transformations in the sequence of I4mm-Cmc21-P21-（different） P21, and two are iso-structural. A low-temperature phase（Pmn21） and a high-temperature high-pressure phase（Pmna） are also recognized.
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| 关 键 词： | 高温高压 硼烷 氨 衍射实验 分子晶体 理论数据 拉曼光谱 环境温度 |
Ammonia borane at high pressures |
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| Jiuhua Chen,Vadym Drozd,Yongzhou Sun,Shah Najiba.Ammonia borane at high pressures[J].Chinese Science Bulletin,2014(36):5227-5234. |
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| Authors: | Jiuhua Chen Vadym Drozd Yongzhou Sun Shah Najiba |
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| Abstract: | Ammonia borane has received tremendous research attention in the past decade because of its potential for chemical hydrogen storage. This paper reviews recent studies about the behavior of ammonia borane at high pressures. While much work is still needed to comprehensively understand the pressure influence on this molecular crystal, a phase diagram based on the available experimental and theoretical data is constructed. Raman spectroscopy studies indicate five transitions upon compression up to 65 GPa at ambient temperature. Diffraction experiments and theoretical studies demonstrate that three of these transitions are first-order phase transformations in the sequence of I4mm-Cmc21-P21-(different) P21, and two are iso-structural. A low-temperature phase(Pmn21) and a high-temperature high-pressure phase(Pmna) are also recognized. |
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| Keywords: | Ammonia borane High pressure Raman spectroscopy X-ray diffraction Phase transition |
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