Hydrogen desorption properties of FCC super-lattice hydride Mg7NbHx prepared by ultra-high pressure techniques

被引：41

作者：

Kyoi, Daisuke ^{[1
]}

Kitamura, Naoyuki ^{[1
]}

Tanaka, Hideaki ^{[1
]}

Ueda, Atsushi ^{[1
]}

Tanase, Shigeo ^{[1
]}

Sakai, Tetsuo ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Res Inst Ubiquitous Energy Devices, Ikeda, Osaka 5638577, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 428卷 / 1-2期

关键词：

high pressure; hydrogen; metal hydride; magnesium; niobium;

D O I：

10.1016/j.jallcom.2006.02.073

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：

Preparation conditions of a FCC phase Mg7NbHx have been investigated in detailed by means of an ultra-high pressure technique. The FCC phase Mg7NbHx was obtained at 4 GPa or higher, but always coexisted with a monoclinic phase MgNb2Hx. Although the monoclinic phase MgNb2Hy, releases only a small amount of hydrogen at around 623 K, the FCC phase Mg7NbHx, exhibits large amount of hydrogen desorption (ca. 4.5 mass%) around 573 K of which temperature is by MgH2. It lower than that of MgH2. It was found that the hydrogen desorption temperature of the FCC hydrides tend to decrease in the following series: Mg7TiHx > Mg7NbHx > Mg6VHx, with increasing the vacancy ratio of the 4b site. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：268 / 273

页数：6

共 20 条

[1] Ca19Mg8H54, a new salt-like ternary metal hydride [J].

Bertheville, B ;

Yvon, K .

JOURNAL OF ALLOYS AND COMPOUNDS, 1999, 290 (1-2) :L8-L10

[2] High-pressure synthesis and crystal structure of Sr2MgH6 [J].

Bertheville, B ;

Yvon, K .

JOURNAL OF ALLOYS AND COMPOUNDS, 1999, 288 (1-2) :197-199

[3] Structural characterization of Mg3MnH∼6 -: a new high-pressure phase synthesized in a multi-anvil cell at 6 GPa [J].

Blomqvist, H ;

Rönnebro, E ;

Kyoi, D ;

Sakai, T ;

Noréus, D .

JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 358 (1-2) :82-86

[4] Mg3MnH7, containing the first known hexahydridomanganese(I) complex [J].

Bortz, M ;

Bertheville, B ;

Yvon, K ;

Movlaev, EA ;

Verbetsky, VN ;

Fauth, F .

JOURNAL OF ALLOYS AND COMPOUNDS, 1998, 279 (02) :L8-L10

[5] High-pressure synthesis of amorphous MgNi1.02H2.2 [J].

Chen, J ;

Sakai, T ;

Kitamura, N ;

Takeshita, HT ;

Kuriyama, N .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (25) :6193-6194

[6] High-pressure synthesis of novel hydrides in Mg-TM systems (TM = Zr, Nb and Mo) [J].

Goto, Y ;

Hayashi, T ;

Kataoka, R ;

Kakuta, H ;

Kamegawa, A ;

Takamura, H ;

Okada, M .

MATERIALS TRANSACTIONS, 2005, 46 (08) :1798-1801

[7] Synthesis of new hydrides in Mg-Y systems by using high pressure [J].

Goto, Y ;

Kamegawa, A ;

Takamura, H ;

Okada, M .

MATERIALS TRANSACTIONS, 2002, 43 (11) :2717-2720

[8] Effect of synthesis pressure on hydride phases in Mg-M systems (M = Mn, Y) [J].

Goto, Yasuyuki ;

Kakuta, Hirofumi ;

Kamegawa, Atsunori ;

Takamura, Hitoshi ;

Okada, Masuo .

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2003, 4 (04) :333-338

[9] Thermal stability of hydrides of magnesium-transition metal system prepared under a high pressure [J].

Kakuta, H ;

Kamegawa, A ;

Takamura, H ;

Okada, M .

MAGNESIUM ALLOYS 2000, 2000, 350-3 :329-332

[10] A novel magnesium-vanadium hydride synthesized by a gigapascal-high-pressure technique [J].

Kyoi, D ;

Sato, T ;

Rönnebro, E ;

Tsuji, Y ;

Kitamura, N ;

Ueda, A ;

Ito, M ;

Katsuyama, S ;

Hara, S ;

Noréus, D ;

Sakai, T .

JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 375 (1-2) :253-258

← 1 2 →