A novel magnesium-vanadium hydride synthesized by a gigapascal-high- pressure technique

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

doi:10.1016/j.jallcom.2003.11.150

A novel magnesium-vanadium hydride synthesized by a gigapascal-high- pressure technique

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

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

67 Citations (Scopus)

Abstract

A magnesium-based vanadium-doped hydride was prepared in a high-pressure anvil cell by reacting a MgH₂-25%V molar mixture at 8GPa and 873K. The new magnesium-vanadium hydride has a cubic F-centred substructure (a=4.721(1)Å), with an additional superstructure, which could be described by a doubling of the cubic cell axis and a magnesium atom framework, including an ordered arrangement of both vanadium atoms and vacancies (a=9.437(3)Å, space group Fm3m (no. 225), Z=4, V=840.55Å³). The metal atom structure is related to the Ca₇Ge type structure but the refined metal atom composition with vacancies on one of the magnesium sites corresponding to Mg₆V nearly in line with EDX analysis. The thermal properties of the new compound were also studied by TPD analysis and TG-DTA. The onset of the hydrogen desorption for the new Mg₆V hydride occurred at a 160K lower temperature when compared to magnesium hydride at a heating rate of 10K/min.

Original language	English
Pages (from-to)	253-258
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	375
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2003.11.150
Publication status	Published - 2004 Jul 28
Externally published	Yes

Keywords

High pressure
Hydrogen
Magnesium
Metal hydrides
Vanadium

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2003.11.150

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A novel magnesium-vanadium hydride synthesized by a gigapascal-high- pressure technique. / Kyoi, Daisuke; Sato, Toyoto; Rönnebro, Ewa; Tsuji, Yasufumi; Kitamura, Naoyuki; Ueda, Atsushi; Ito, Mikio; Katsuyama, Shigeru; Hara, Shigeta; Noréus, Dag; Sakai, Tetsuo.

In: Journal of Alloys and Compounds, Vol. 375, No. 1-2, 28.07.2004, p. 253-258.

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

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title = "A novel magnesium-vanadium hydride synthesized by a gigapascal-high- pressure technique",

abstract = "A magnesium-based vanadium-doped hydride was prepared in a high-pressure anvil cell by reacting a MgH2-25%V molar mixture at 8GPa and 873K. The new magnesium-vanadium hydride has a cubic F-centred substructure (a=4.721(1){\AA}), with an additional superstructure, which could be described by a doubling of the cubic cell axis and a magnesium atom framework, including an ordered arrangement of both vanadium atoms and vacancies (a=9.437(3){\AA}, space group Fm3m (no. 225), Z=4, V=840.55{\AA}3). The metal atom structure is related to the Ca7Ge type structure but the refined metal atom composition with vacancies on one of the magnesium sites corresponding to Mg6V nearly in line with EDX analysis. The thermal properties of the new compound were also studied by TPD analysis and TG-DTA. The onset of the hydrogen desorption for the new Mg6V hydride occurred at a 160K lower temperature when compared to magnesium hydride at a heating rate of 10K/min.",

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

author = "Daisuke Kyoi and Toyoto Sato and Ewa R{\"o}nnebro and Yasufumi Tsuji 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. Kyoi thanks the Hosokawa Powder Technology Foundation for the grant. 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. Finally, in the memory of Prof. Dr. Hiroshi Nagai, we would like to express our deepest gratitude for his continuous support in this work, and thus dedicate this article to him. ",

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AU - Kyoi, Daisuke

AU - Sato, Toyoto

AU - Rönnebro, Ewa

AU - Tsuji, Yasufumi

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. Kyoi thanks the Hosokawa Powder Technology Foundation for the grant. 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. Finally, in the memory of Prof. Dr. Hiroshi Nagai, we would like to express our deepest gratitude for his continuous support in this work, and thus dedicate this article to him.

PY - 2004/7/28

Y1 - 2004/7/28

N2 - A magnesium-based vanadium-doped hydride was prepared in a high-pressure anvil cell by reacting a MgH2-25%V molar mixture at 8GPa and 873K. The new magnesium-vanadium hydride has a cubic F-centred substructure (a=4.721(1)Å), with an additional superstructure, which could be described by a doubling of the cubic cell axis and a magnesium atom framework, including an ordered arrangement of both vanadium atoms and vacancies (a=9.437(3)Å, space group Fm3m (no. 225), Z=4, V=840.55Å3). The metal atom structure is related to the Ca7Ge type structure but the refined metal atom composition with vacancies on one of the magnesium sites corresponding to Mg6V nearly in line with EDX analysis. The thermal properties of the new compound were also studied by TPD analysis and TG-DTA. The onset of the hydrogen desorption for the new Mg6V hydride occurred at a 160K lower temperature when compared to magnesium hydride at a heating rate of 10K/min.

AB - A magnesium-based vanadium-doped hydride was prepared in a high-pressure anvil cell by reacting a MgH2-25%V molar mixture at 8GPa and 873K. The new magnesium-vanadium hydride has a cubic F-centred substructure (a=4.721(1)Å), with an additional superstructure, which could be described by a doubling of the cubic cell axis and a magnesium atom framework, including an ordered arrangement of both vanadium atoms and vacancies (a=9.437(3)Å, space group Fm3m (no. 225), Z=4, V=840.55Å3). The metal atom structure is related to the Ca7Ge type structure but the refined metal atom composition with vacancies on one of the magnesium sites corresponding to Mg6V nearly in line with EDX analysis. The thermal properties of the new compound were also studied by TPD analysis and TG-DTA. The onset of the hydrogen desorption for the new Mg6V hydride occurred at a 160K lower temperature when compared to magnesium hydride at a heating rate of 10K/min.

KW - High pressure

KW - Hydrogen

KW - Magnesium

KW - Metal hydrides

KW - Vanadium

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SN - 0925-8388

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ER -

A novel magnesium-vanadium hydride synthesized by a gigapascal-high- pressure technique

Abstract

Keywords

ASJC Scopus subject areas

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