The crystal structure of magnesium dicarbide

The crystal structure of MgC 2 is solved from powder X-ray and neutron diffraction data. Magnesium dicarbide is synthesized from Mg powder and ethyne, with yields of up to 40 wt.% (balance: unreacted Mg and MgO). The X-ray pattern is indexed on a tetragonal unit cell, with space group P4 2/ mnm sugg...

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Bibliographic Details
Published in:Journal of alloys and compounds 1999, Vol.282 (1), p.72-75
Main Authors: Karen, P., Kjekshus, A., Huang, Q., Karen, V.L.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crystal structure
Exact sciences and technology
Hydrides, borides, nitrides, etc., and metalloidal compounds
Inorganic compounds
Magnesium dicarbide
Physics
Powder neutron diffraction
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary:The crystal structure of MgC 2 is solved from powder X-ray and neutron diffraction data. Magnesium dicarbide is synthesized from Mg powder and ethyne, with yields of up to 40 wt.% (balance: unreacted Mg and MgO). The X-ray pattern is indexed on a tetragonal unit cell, with space group P4 2/ mnm suggested from systematic extinctions. The unit cell refined from the powder neutron diffraction data has a=3.9342(7) and c=5.021(1) Å and Z=2. The crystal structure contains C 2 groups, with a triple-bond length of 1.215(6) Å, aligned in …MgCCMgCCMg… chains having Mg–C bond lengths of 2.174(4) Å and a weak interaction [2.510(1) Å] between Mg and the triple bond of the crossing chains above and below.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(98)00828-7