A new ternary magnesium-titanium hydride Mg7TiHx with hydrogen desorption properties better than both binary magnesium and titanium hydrides

Daisuke Kyoi; Toyoto Sato; Ewa Rönnebro; Naoyuki Kitamura; Atsushi Ueda; Mikio Ito; Shigeru Katsuyama; Shigeta Hara; Dag Noréus; Tetsuo Sakai

doi:10.1016/j.jallcom.2003.08.098

A new ternary magnesium-titanium hydride Mg₇TiH_x with hydrogen desorption properties better than both binary magnesium and titanium hydrides

Daisuke Kyoi, Toyoto Sato, Ewa Rönnebro, Naoyuki Kitamura, Atsushi Ueda, Mikio Ito, Shigeru Katsuyama, Shigeta Hara, Dag Noréus, Tetsuo Sakai

Research output: Contribution to journal › Article › peer-review

125 Citations (Scopus)

Abstract

A magnesium based titanium doped hydride was prepared in a high-pressure anvil cell by reacting a mixture of MgH₂ and TiH_1.9 at 8GPa and 873K. The metal structure has a Ca₇Ge type structure (a = 9.532(2)Å, space group Fm3̄m (no. 225), Z = 4, V = 866.06Å³). The refined metal atom composition Mg₇Ti was almost in line with EDS analysis. This means that the new magnesium-titanium hydride has a structure that is more related to TiH_1.9 than to MgH₂. The thermal properties of the new compound were also studied by TPD analysis. The new hydride, Mg₇TiH_x exhibits 5.5mass% (x ≈ 12.7) and decomposes into Mg and TiH_1.9 upon releasing 4.7mass% of hydrogen around 605K, that is at a 130 and 220K lower desorption temperature compared to MgH₂ and TiH_1.9, respectively.

Original language	English
Pages (from-to)	213-217
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	372
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2003.08.098
Publication status	Published - 2004 Jun 9
Externally published	Yes

Keywords

High pressure
Hydrogen
Magnesium
Metal hydrides
Titanium

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2003.08.098

Cite this

A new ternary magnesium-titanium hydride Mg₇TiH_x with hydrogen desorption properties better than both binary magnesium and titanium hydrides. / Kyoi, Daisuke; Sato, Toyoto; Rönnebro, Ewa; Kitamura, Naoyuki; Ueda, Atsushi; Ito, Mikio; Katsuyama, Shigeru; Hara, Shigeta; Noréus, Dag; Sakai, Tetsuo.

In: Journal of Alloys and Compounds, Vol. 372, No. 1-2, 09.06.2004, p. 213-217.

Research output: Contribution to journal › Article › peer-review

Kyoi, Daisuke ; Sato, Toyoto ; Rönnebro, Ewa ; Kitamura, Naoyuki ; Ueda, Atsushi ; Ito, Mikio ; Katsuyama, Shigeru ; Hara, Shigeta ; Noréus, Dag ; Sakai, Tetsuo. / A new ternary magnesium-titanium hydride Mg₇TiH_x with hydrogen desorption properties better than both binary magnesium and titanium hydrides. In: Journal of Alloys and Compounds. 2004 ; Vol. 372, No. 1-2. pp. 213-217.

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title = "A new ternary magnesium-titanium hydride Mg7TiHx with hydrogen desorption properties better than both binary magnesium and titanium hydrides",

abstract = "A magnesium based titanium doped hydride was prepared in a high-pressure anvil cell by reacting a mixture of MgH2 and TiH1.9 at 8GPa and 873K. The metal structure has a Ca7Ge type structure (a = 9.532(2){\AA}, space group Fm{\=3}m (no. 225), Z = 4, V = 866.06{\AA}3). The refined metal atom composition Mg7Ti was almost in line with EDS analysis. This means that the new magnesium-titanium hydride has a structure that is more related to TiH1.9 than to MgH2. The thermal properties of the new compound were also studied by TPD analysis. The new hydride, Mg7TiHx exhibits 5.5mass% (x ≈ 12.7) and decomposes into Mg and TiH1.9 upon releasing 4.7mass% of hydrogen around 605K, that is at a 130 and 220K lower desorption temperature compared to MgH2 and TiH1.9, respectively.",

keywords = "High pressure, Hydrogen, Magnesium, Metal hydrides, Titanium",

author = "Daisuke Kyoi and Toyoto Sato and Ewa R{\"o}nnebro and Naoyuki Kitamura and Atsushi Ueda and Mikio Ito and Shigeru Katsuyama and Shigeta Hara and Dag Nor{\'e}us and Tetsuo Sakai",

note = "Funding Information: This work was supported by “Priority Assistance of the Formation of Worldwide Renowned Centers of Research, The 21st COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Designs)” from the Ministry of Education, Sports, Culture, Science and Technology of Japan. R{\"o}nnebro thanks AIST Kansai Center for financial support. Authors are grateful to Prof. Y. Fukai of Chuo University, for his technical advice on the NaCl capsule method.",

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doi = "10.1016/j.jallcom.2003.08.098",

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T1 - A new ternary magnesium-titanium hydride Mg7TiHx with hydrogen desorption properties better than both binary magnesium and titanium hydrides

AU - Kyoi, Daisuke

AU - Sato, Toyoto

AU - Rönnebro, Ewa

AU - Kitamura, Naoyuki

AU - Ueda, Atsushi

AU - Ito, Mikio

AU - Katsuyama, Shigeru

AU - Hara, Shigeta

AU - Noréus, Dag

AU - Sakai, Tetsuo

N1 - Funding Information: This work was supported by “Priority Assistance of the Formation of Worldwide Renowned Centers of Research, The 21st COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Designs)” from the Ministry of Education, Sports, Culture, Science and Technology of Japan. Rönnebro thanks AIST Kansai Center for financial support. Authors are grateful to Prof. Y. Fukai of Chuo University, for his technical advice on the NaCl capsule method.

PY - 2004/6/9

Y1 - 2004/6/9

N2 - A magnesium based titanium doped hydride was prepared in a high-pressure anvil cell by reacting a mixture of MgH2 and TiH1.9 at 8GPa and 873K. The metal structure has a Ca7Ge type structure (a = 9.532(2)Å, space group Fm3̄m (no. 225), Z = 4, V = 866.06Å3). The refined metal atom composition Mg7Ti was almost in line with EDS analysis. This means that the new magnesium-titanium hydride has a structure that is more related to TiH1.9 than to MgH2. The thermal properties of the new compound were also studied by TPD analysis. The new hydride, Mg7TiHx exhibits 5.5mass% (x ≈ 12.7) and decomposes into Mg and TiH1.9 upon releasing 4.7mass% of hydrogen around 605K, that is at a 130 and 220K lower desorption temperature compared to MgH2 and TiH1.9, respectively.

AB - A magnesium based titanium doped hydride was prepared in a high-pressure anvil cell by reacting a mixture of MgH2 and TiH1.9 at 8GPa and 873K. The metal structure has a Ca7Ge type structure (a = 9.532(2)Å, space group Fm3̄m (no. 225), Z = 4, V = 866.06Å3). The refined metal atom composition Mg7Ti was almost in line with EDS analysis. This means that the new magnesium-titanium hydride has a structure that is more related to TiH1.9 than to MgH2. The thermal properties of the new compound were also studied by TPD analysis. The new hydride, Mg7TiHx exhibits 5.5mass% (x ≈ 12.7) and decomposes into Mg and TiH1.9 upon releasing 4.7mass% of hydrogen around 605K, that is at a 130 and 220K lower desorption temperature compared to MgH2 and TiH1.9, respectively.

KW - High pressure

KW - Hydrogen

KW - Magnesium

KW - Metal hydrides

KW - Titanium

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