Structural investigations of two new ternary magnesium-niobium hydrides, Mg6.5NbH∼14 and MgNb2H∼4

Toyoto Sato; Daisuke Kyoi; Ewa Rönnebro; Naoyuki Kitamura; Tetsuo Sakai; Dag Noréus

doi:10.1016/j.jallcom.2005.08.068

Structural investigations of two new ternary magnesium-niobium hydrides, Mg_6.5NbH_∼14 and MgNb₂H_∼4

Toyoto Sato, Daisuke Kyoi, Ewa Rönnebro, Naoyuki Kitamura, Tetsuo Sakai, Dag Noréus

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

52 Citations (Scopus)

Abstract

Two new magnesium-niobium hydrides, Mg_6.5NbH_∼14 with a face centred cubic unit cell a = 9.548(1) Å (space group F m over(3, ̄) m (No. 225), Z = 4, V = 870.49 Å³) and MgNb₂H_∼4 with a C-centred monoclinic unit cell a = 5.685 (4) Å, b = 3.2914(6) Å, c = 7.924(2) Å and β = 103.82(3)° (space group C2/m (No. 12), Z = 2, V = 143.98 Å³), were synthesized by reacting MgH₂ and Nb in a high-pressure anvil cell at 8 GPa and 600 °C. The structures of the new hydrides were refined from synchrotron radiation data. Mg_6.5NbH_∼14 has a structure related to Mg₇TiH_∼16 (a = 9.532(2) Å space group F m over(3, ̄) m (No. 225)) (D. Kyoi, T. Sato, E. Rönnebro, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Noréus, T. Sakai, J. Alloys Compd. 372 (2004) 213). Where the metal atom structure is of the Ca₇Ge type. Mg_6.5NbH_∼14, however, has some vacancies on one of the magnesium sites similar to the recently discovered Mg₆VH_∼14 (D. Kyoi, T. Sato, E. Rönnebro, Y. Tsuji, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Noréus, T. Sakai, J. Alloys Compd. 375 (2004) 253). The metal atoms in MgNb₂H_∼4 have the AuTe₂ type structure.

Original language	English
Pages (from-to)	230-234
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	417
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2005.08.068
Publication status	Published - 2006 Jun 29
Externally published	Yes

Keywords

High-pressure
Magnesium
Metal hydride
Niobium
Synchrotron

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2005.08.068

Cite this

@article{260d7c6948b84befa072f79ccac0d354,

title = "Structural investigations of two new ternary magnesium-niobium hydrides, Mg6.5NbH∼14 and MgNb2H∼4",

abstract = "Two new magnesium-niobium hydrides, Mg6.5NbH∼14 with a face centred cubic unit cell a = 9.548(1) {\AA} (space group F m over(3,{\= }) m (No. 225), Z = 4, V = 870.49 {\AA}3) and MgNb2H∼4 with a C-centred monoclinic unit cell a = 5.685 (4) {\AA}, b = 3.2914(6) {\AA}, c = 7.924(2) {\AA} and β = 103.82(3)° (space group C2/m (No. 12), Z = 2, V = 143.98 {\AA}3), were synthesized by reacting MgH2 and Nb in a high-pressure anvil cell at 8 GPa and 600 °C. The structures of the new hydrides were refined from synchrotron radiation data. Mg6.5NbH∼14 has a structure related to Mg7TiH∼16 (a = 9.532(2) {\AA} space group F m over(3,{\= }) m (No. 225)) (D. Kyoi, T. Sato, E. R{\"o}nnebro, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Nor{\'e}us, T. Sakai, J. Alloys Compd. 372 (2004) 213). Where the metal atom structure is of the Ca7Ge type. Mg6.5NbH∼14, however, has some vacancies on one of the magnesium sites similar to the recently discovered Mg6VH∼14 (D. Kyoi, T. Sato, E. R{\"o}nnebro, Y. Tsuji, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Nor{\'e}us, T. Sakai, J. Alloys Compd. 375 (2004) 253). The metal atoms in MgNb2H∼4 have the AuTe2 type structure.",

keywords = "High-pressure, Magnesium, Metal hydride, Niobium, Synchrotron",

author = "Toyoto Sato and Daisuke Kyoi and Ewa R{\"o}nnebro and Naoyuki Kitamura and Tetsuo Sakai and Dag Nor{\'e}us",

note = "Funding Information: Financial support has been obtained from the HYSTORY project under the European Commission 5FP EESD program. The authors thank to Ms. A. Kitano at the Japan Synchrotron Radiation Research Institute (JASRI) for her valuable support. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO), “Basic Technology Development Project for Hydrogen Safety and Utilization”. ",

year = "2006",

month = jun,

day = "29",

doi = "10.1016/j.jallcom.2005.08.068",

language = "English",

volume = "417",

pages = "230--234",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

number = "1-2",

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TY - JOUR

T1 - Structural investigations of two new ternary magnesium-niobium hydrides, Mg6.5NbH∼14 and MgNb2H∼4

AU - Sato, Toyoto

AU - Kyoi, Daisuke

AU - Rönnebro, Ewa

AU - Kitamura, Naoyuki

AU - Sakai, Tetsuo

AU - Noréus, Dag

N1 - Funding Information: Financial support has been obtained from the HYSTORY project under the European Commission 5FP EESD program. The authors thank to Ms. A. Kitano at the Japan Synchrotron Radiation Research Institute (JASRI) for her valuable support. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO), “Basic Technology Development Project for Hydrogen Safety and Utilization”.

PY - 2006/6/29

Y1 - 2006/6/29

N2 - Two new magnesium-niobium hydrides, Mg6.5NbH∼14 with a face centred cubic unit cell a = 9.548(1) Å (space group F m over(3, ̄) m (No. 225), Z = 4, V = 870.49 Å3) and MgNb2H∼4 with a C-centred monoclinic unit cell a = 5.685 (4) Å, b = 3.2914(6) Å, c = 7.924(2) Å and β = 103.82(3)° (space group C2/m (No. 12), Z = 2, V = 143.98 Å3), were synthesized by reacting MgH2 and Nb in a high-pressure anvil cell at 8 GPa and 600 °C. The structures of the new hydrides were refined from synchrotron radiation data. Mg6.5NbH∼14 has a structure related to Mg7TiH∼16 (a = 9.532(2) Å space group F m over(3, ̄) m (No. 225)) (D. Kyoi, T. Sato, E. Rönnebro, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Noréus, T. Sakai, J. Alloys Compd. 372 (2004) 213). Where the metal atom structure is of the Ca7Ge type. Mg6.5NbH∼14, however, has some vacancies on one of the magnesium sites similar to the recently discovered Mg6VH∼14 (D. Kyoi, T. Sato, E. Rönnebro, Y. Tsuji, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Noréus, T. Sakai, J. Alloys Compd. 375 (2004) 253). The metal atoms in MgNb2H∼4 have the AuTe2 type structure.

AB - Two new magnesium-niobium hydrides, Mg6.5NbH∼14 with a face centred cubic unit cell a = 9.548(1) Å (space group F m over(3, ̄) m (No. 225), Z = 4, V = 870.49 Å3) and MgNb2H∼4 with a C-centred monoclinic unit cell a = 5.685 (4) Å, b = 3.2914(6) Å, c = 7.924(2) Å and β = 103.82(3)° (space group C2/m (No. 12), Z = 2, V = 143.98 Å3), were synthesized by reacting MgH2 and Nb in a high-pressure anvil cell at 8 GPa and 600 °C. The structures of the new hydrides were refined from synchrotron radiation data. Mg6.5NbH∼14 has a structure related to Mg7TiH∼16 (a = 9.532(2) Å space group F m over(3, ̄) m (No. 225)) (D. Kyoi, T. Sato, E. Rönnebro, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Noréus, T. Sakai, J. Alloys Compd. 372 (2004) 213). Where the metal atom structure is of the Ca7Ge type. Mg6.5NbH∼14, however, has some vacancies on one of the magnesium sites similar to the recently discovered Mg6VH∼14 (D. Kyoi, T. Sato, E. Rönnebro, Y. Tsuji, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Noréus, T. Sakai, J. Alloys Compd. 375 (2004) 253). The metal atoms in MgNb2H∼4 have the AuTe2 type structure.

KW - High-pressure

KW - Magnesium

KW - Metal hydride

KW - Niobium

KW - Synchrotron

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U2 - 10.1016/j.jallcom.2005.08.068

DO - 10.1016/j.jallcom.2005.08.068

M3 - Article

AN - SCOPUS:33646883006

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JO - Journal of Alloys and Compounds

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