Synthesis and structural study of Ti-rich Mg-Ti hydrides

被引：16
作者：
Asano, Kohta [1 ]
Kim, Hyunjeong [1 ]
Sakaki, Kouji [1 ]
Page, Katharine [2 ]
Hayashi, Shigenobu [1 ]
Nakamura, Yumiko [1 ]
Akiba, Etsuo [3 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan
[2] Los Alamos Natl Lab, Lujan Neutron Scattering Ctr, Los Alamos, NM 87545 USA
[3] Kyushu Univ, Fac Engn, Dept Mech Engn, Nishi Ku, Fukuoka 8190395, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 593卷
关键词：
Hydrogen storage; Magnesium-titanium hydrides; Mechanical alloying; Synchrotron X-ray total scattering; Nuclear magnetic resonance (NMR); ELECTROCHEMICAL HYDROGEN STORAGE; MECHANICALLY ALLOYED MG50CO50; X-RAY-DIFFRACTION; THIN-FILMS; TITANIUM HYDRIDE; SWITCHABLE MIRRORS; FCC HYDRIDES; BCC ALLOYS; H SYSTEM; MAGNESIUM;
D O I：
10.1016/j.jallcom.2014.01.061
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：
MgxTi1 x (x = 0.15, 0.25, 0.35) alloys were synthesized by means of ball milling. Under a hydrogen pressure of 8 MPa at 423 K these Mg-Ti alloys formed a hydride phase with a face centered cubic (FCC) structure. The hydride for x = 0.25 consisted of single Mg0.25Ti0.75H1.62 FCC phase but TiH2 and MgH2 phases were also formed in the hydrides for x = 0.15 and 0.35, respectively. X-ray diffraction patterns and the atomic pair distribution function indicated that numbers of stacking faults were introduced. There was no sign of segregation between Mg and Ti in Mg0.25Ti0.75H1.62. Electronic structure of Mg0.25-Ti0.75H1.62 was different from those of MgH2 and TiH2, which was demonstrated by H-1 nuclear magnetic resonance. This strongly suggested that stable Mg-Ti hydride phase was formed in the metal composition of Mg0.25Ti0.75 without disproportion into MgH2 and TiH2. (C) 2014 Elsevier B. V. All rights reserved.
引用
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页码：132 / 136
页数：5
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