Structural study of ball-milled sodium alanate under high pressure

被引：4
作者：
Vennila, R. Selva [1 ]
Drozd, Vadym [1 ]
George, Lyci [1 ]
Saxena, Surendra K. [1 ]
Liermann, Hanns-Peter [2 ,3 ]
Liu, H. Z. [4 ]
Stowe, Ashley C. [5 ]
Berseth, Polly [5 ]
Anton, Donald [5 ]
Zidan, Ragaiy [5 ]
机构：
[1] Florida Int Univ, Ctr Study Matter Extreme Condit, Miami, FL 33199 USA
[2] Argonne Natl Lab, Adv Photon Source, HPCAT, Argonne, IL 60439 USA
[3] Argonne Natl Lab, Adv Photon Source, Geophys Lab, Argonne, IL 60439 USA
[4] Carnegie Inst Sci, HPCAT, Geophys Lab, Argonne, IL 60439 USA
[5] Energy Secur Dept, Savannah River Natl Lab, Aiken, SC 29808 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 473卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
Hydrogen absorbing materials; Phase transitions; Crystal structure; Strain; High pressure; X-ray diffraction; X-RAY-DIFFRACTION; HYDROGEN STORAGE; PHASE-TRANSFORMATIONS; DECOMPOSITION; SPECTROSCOPY; HYDRIDES; NAALH4;
D O I：
10.1016/j.jallcom.2008.06.036
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ball-milled NaAlH4 was studied up to 15 GPa in a diamond anvil cell (DAC) by X-ray diffraction using a synchrotron radiation source. Lattice parameters were determined from the X-ray diffraction data at various pressures up to 6.5 GPa. Intensity of the powder diffraction patterns decreased with increasing pressure. Amorphisation started at a pressure of similar to 6.5 GPa and completed at 13.5 GPa. Reversible phase transformation from amorphous phase to the tetragonal phase was observed. A fit to the pressure-volume data equation of state was obtained using the Birch-Murnaghan equation of state and the bulk modulus was found to be 52.16 +/- 0.9 GPa which is twice higher than the unmilled NaAlH4. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：576 / 578
页数：3
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