Dynamic synthesis of ternary Mg2FeH6

Infrared Spectroscopic and Computational Studies on Li₄FeH₆ with High Gravimetric Hydrogen Density

“…[1][2][3][4][5][6][7][8] In the complex hydrides, [FeH 6 ] 4− is generally counterbalanced by alkaline-earth metals (e.g. Mg 2 FeH 6 ) or mixed alkali/transition metals (e.g.…”

Mg2FeH6 Synthesis Efficiency Map

“…Further observation of the diffractograms after sintering at 300 • C shows that the magnesium hydride peaks are typical for those received after mechanical milling; these peaks have low intensity and are broad, indicating that 300 • C is neither high enough to release the post-processing stress in the particles, nor high enough to destroy the nanostructure, which is commonly observed for magnesium hydride fabricated with this method. In our previous studies concerning the synthesis of this compound [9,10], when the reaction was traced in situ using synchrotron radiation X-ray diffraction (SRXRD) or pressure changes in a Sieverts apparatus, we observed that the reaction started at approximately 350 • C when the mixture was heated at a rate of 5 • C/min. However, if the synthesis is thermodynamically possible under the chosen conditions (which is true here), the transformation will occur after a certain time.…”

“…In 2010, we presented results showing the possibility of a very fast and effective synthesis of Mg 2 FeH 6 by ball milling and subsequent sintering under hydrogen pressure. The main finding was that ternary hydride could be formed in the direct reaction between magnesium hydride and iron without prior decomposition of MgH 2 [9,10]. Attempts to optimize the process were made to determine the optimum mechanical milling time for the process.…”

A Review of Recent Advances on the Effects of Microstructural Refinement and Nano-Catalytic Additives on the Hydrogen Storage Properties of Metal and Complex Hydrides

“…This Mg-Fe nanocomposite exhibits quite remarkable hydrogen absorption/desorption properties as shown in Figure 11. Figure 11a shows the total hydrogen absorption curve of the 2Mg-Fe (molar ratio) nanocomposite formed during decomposition of previously synthesized ternary Mg 2 FeH 6 precursor [24]. At the temperature of barely 30 °C the sample kept under hydrogen pressure for 10 h shows a significant 1.1 mass % absorption of hydrogen.…”

“…At the temperature of barely 30 °C the sample kept under hydrogen pressure for 10 h shows a significant 1.1 mass % absorption of hydrogen. For the clarity, it is to be pointed out that for the molar ratio 2MgH 2 -Fe used in the synthesis [24] the theoretical maximum hydrogen quantity that could be absorbed is ~3.7 wt.%. It is most likely that prolonging the absorption time much beyond 10 h the 2Mg-Fe nanocomposite could absorb even more H 2 at 30 °C .…”