Affordable Access

Publisher Website

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

Journal of Alloys and Compounds
Publication Date
DOI: 10.1016/j.jallcom.2005.08.068
  • Synchrotron
  • High-Pressure
  • Metal Hydride
  • Magnesium
  • Niobium


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 3 ¯   m (No. 225), Z = 4, V = 870.49 Å 3) and MgNb 2H ∼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 Å 3), were synthesized by reacting MgH 2 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 Mg 7TiH ∼16 ( a = 9.532(2) Å space group F m 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 Ca 7Ge type. Mg 6.5NbH ∼14, however, has some vacancies on one of the magnesium sites similar to the recently discovered Mg 6VH ∼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 MgNb 2H ∼4 have the AuTe 2 type structure.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

Crystal Structure Refinement of MgNb2O6Columbite f...

on Journal of Solid State Chemist... Jan 01, 1997

Spectroscopic investigations of Ni2+in MgNb2O6and...

on Journal of Luminescence Jan 01, 1997

High-pressure synthesis and crystal structures of...

on Journal of Alloys and Compound... Jan 01, 2002

The influence of structural disorder on the lumine...

on Materials Chemistry and Physic... Jan 01, 1986
More articles like this..