Controlled mechano-chemical synthesis of nanostructured ternary complex hydride Mg2FeH6 under low-energy impact mode with and without pre-milling

Li, Songlin; Varin, R.A.; Morozova, O. S.; Khomenko, T. I.

doi:10.1016/j.jallcom.2004.05.018

Cited by 59 publications

(31 citation statements)

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“…An example is the formation of Mg 2 FeH 6 [233]. This class of metal hydrides could be synthesized by high hydrogen pressure [234], thin films [235] or ball milling [236][237][238][239]. In the case of thin films, metastable phases could be stabilized by the high stresses due to the clamping of the material to the substrate [201,240,241].…”

Section: Reduction Of the Heat Of Formationmentioning

confidence: 99%

Metal Hydrides

Huot

2010

Handbook of Hydrogen Storage

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Metal hydrides are promising candidates for many stationary and mobile hydrogen storage applications. Presently, the most common use of metal hydrides is as anode material in commercial nickel-metal hydrides (Ni-MH) rechargeable batteries which have replaced conventional nickel-cadmium batteries in many applications. A wide variety of Ni-MH batteries are now on the market with cell sizes ranging from 30 mAh to 250 Ah [1,2]. Some other applications are: hydrogen compression [3], aircraft fire-detectors [4], isotope separation [5], and hydrogen getters for microelectronic packages. Hydride formation is also used in the HDDR process (hydrogenation-disproportionation-desorption-recombination) for the synthesis of magnetic materials such as Nd 2 Fe 14 B [6]. A striking application is as a component of cryocoolers for the ESA Planck mission [7]. Another exciting new application is the use of metal hydrides for switchable mirrors [8]. As we can see, metal hydrides have a wide range of applications. However, most research and development is targeted towards two applications: batteries and hydrogen storage. The former is now widely exploited but the latter is still facing many technical problems. The main advantages of storing hydrogen in a metal hydride are the high hydrogen volumetric densities (sometimes higher than in liquid hydrogen) and the possibility to absorb and desorb hydrogen with a small change in hydrogen pressure [9].The physics of hydrogen in elemental metals was reviewed at the end of the 1970s in thebooksHydrogeninMetals,volumesIandII [10,11].The1970s alsosawtheemergence of the important field of intermetallic compounds as hydride materials. An in-depth review of this field can be found in Hydrogen in Intermetallic Compounds volumes I, and II [12,13]. A review of the propertiesand applications of hydrogen in metals can befound in the third volume of Hydrogen in Metals [14]. The basic properties of the metal-hydrogen system are discussed from a fundamental point of view by Fukai [15]. Although initial studies on nanocrystalline and amorphous metal hydrides were initiated around the 1980s [16], the real emergence of nanocrystalline metal hydrides as a new class of Handbook of Hydrogen Storage. Edited by Michael Hirscher

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Section: Reduction Of the Heat Of Formationmentioning

confidence: 99%

Metal Hydrides

Huot

2010

Handbook of Hydrogen Storage

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“…The synthesis of Mg 2 FeH 6 by ball milling has been studied by several authors using different milling parameters, such as: type of mill; ball to powder ratio; number and size of balls; milling time; rotational speed; milling atmosphere and hydrogen pressure [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Irrespective of the milling conditions, some iron was always detected in the milled powder representing an incomplete Mg 2 FeH 6 formation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

Asselli

Huot

2014

Metals

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Abstract:In this study we investigated the synthesis and the hydrogen storage properties of Mg 2 FeH 6 . The complex hydride was prepared by ball milling under argon and hydrogen atmosphere from 2Mg + Fe and 2MgH 2 + Fe compositions. The samples were characterized by X-ray powder diffraction and scanning electron microcopy. Kinetics of hydrogen absorption and desorption were measured in a Sievert's apparatus. We found that the milling atmosphere plays a more important role on Mg 2 FeH 6 synthesis than the starting compositions. Ball milling under hydrogen pressure resulted in smaller particles sizes and doubled the yield of Mg 2 FeH 6 formation. Despite the microstructural differences after ball milling, all samples had similar hydrogen absorption and desorption kinetics. Loss of capacity was observed after only five cycles of hydrogen absorption/desorption.

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“…The obtained material had a gravimetric capacity up to 5.2 wt% H 2 , but the process involved milling under hydrogen pressure for very long periods (up to 80 h). Both Li et al and Varin et al [7,8] attempted to synthesize Mg 2 FeH 6 by a process called controlled reactive mechanical alloying. The process consists of two steps.…”

Section: Introductionmentioning

confidence: 99%

Mg2FeH6 Synthesis Efficiency Map

et al. 2018

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Abstract:The influences of the processing parameters on the Mg 2 FeH 6 synthesis yield were studied. Mixtures of magnesium hydride (MgH 2 ) and iron (Fe) were mechanically milled in a planetary ball mill under argon for 0.5-, 1-, 2-and 3-h periods and subsequently sintered at temperatures from 300-500 • C under hydrogen. The reaction yield, phase content and hydrogen storage properties of the received materials were investigated. The morphologies of the powders after synthesis were studied by SEM. The synthesis effectiveness map was presented. The obtained results prove that synthesis parameters, such as the milling time and synthesis temperature, greatly influence the reaction yield and material properties and show that extended mechanical milling may not be beneficial to the reaction efficiency.

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Controlled mechano-chemical synthesis of nanostructured ternary complex hydride Mg2FeH6 under low-energy impact mode with and without pre-milling

Cited by 59 publications

References 20 publications

Metal Hydrides

Metal Hydrides

Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

Mg2FeH6 Synthesis Efficiency Map

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