Complex transition metal hydrides incorporating ionic hydrogen: Synthesis and characterization of Na2Mg2FeH8 and Na2Mg2RuH8

JOURNAL OF ALLOYS AND COMPOUNDS

卷:645

Article; Proceedings Paper

Humphries, Terry D.¹  Takagi, Shigeyuki²  Li, Guanqiao²  Matsuo, Motoaki²  Sato, Toyoto²  Sorby, Magnus H.³  Deledda, Stefano³  Hauback, Bjorn C.³  Orimo, Shin-ichi^1,2 

[1] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Inst Energy Technol, Dept Phys, NO-2027 Kjeller, Norway

关键词: Metal hydrides;    Mechanochemical processing;    Crystal structure;    Neutron diffraction;    X-ray diffraction;    Energy storage materials;   

DOI  :  10.1016/j.jallcom.2014.12.113

来源: Elsevier

【 摘 要 】

A new class of quaternary complex transition metal hydrides (Na2Mg2TH8 (T = Fe, Ru)) have been synthesized and their structures determined by combined synchrotron radiation X-ray and powder neutron diffraction. The compounds can be considered as a link between ionic and complex hydrides in terms of incorporating independently coordinated ionic and covalent hydrogen. These novel isostructural complex transition metal hydrides crystallize in the orthorhombic space group Pbam, where the octahedral complex hydride anion is surrounded by a cubic array of four Mg2+ and four Na+ cations, forming distinct two-dimensional layers. An intriguing feature of these materials is the distorted octahedral coordination of the isolated H anions by four Na+ and two Mg2+ cations, which form layers between the transition metal containing layers. The vibrational modes of the H anions and complex hydride anion are independently observed for the first time in a quaternary complex transition metal hydride system by Raman and IR spectroscopy. (C) 2014 Elsevier B.V. All rights reserved.

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