Effect of the nature of the starting materials on the formation of Mg2FeH6

Castro, Federico de; Gennari, F.C.

doi:10.1016/j.jallcom.2003.11.147

Cited by 48 publications

(35 citation statements)

References 9 publications

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“…Our results are different from the study of Castro and Gennari [11]. These authors investigated the synthesis of Mg 2 FeH 6 by ball milling under H 2 pressure.…”

Section: Microstructural Characterizationcontrasting

confidence: 99%

“…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%

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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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“…Our results are different from the study of Castro and Gennari [11]. These authors investigated the synthesis of Mg 2 FeH 6 by ball milling under H 2 pressure.…”

Section: Microstructural Characterizationcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Asselli

Huot

2014

Metals

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“…In all cases other than sintering at 500 • C, a typical composite structure with unreacted iron and magnesium hydride was observed. Such structures were observed before also by Castro and Gennari [35]. …”

Section: Microstructuresupporting

confidence: 79%

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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“…This mechanically activated method can reduce the grain and particles sizes to nanometric scale and improve the hydrogen sorption kinetics of the hydrides 7,8 . The synthesis of the ternary complex hydride, Mg 2 FeH 6 , using ball milling from the stoichiometric compositions 2Mg-Fe or 2MgH 2 -Fe were also studied using different milling conditions [9][10][11][12][13][14][15][16] . Regardless of the milling condition, a remaining iron was always present after milling, which represents an incomplete reaction of hydride formation and results in a lower hydrogen density.…”

Section: Introductionmentioning

confidence: 99%

Mg2FeH6-based nanocomposites with high capacity of hydrogen storage processed by reactive milling

et al. 2012

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The compound Mg 2 FeH 6 was synthesized from a 2Mg-Fe mixture in a single process through high-energy ball milling under hydrogen atmosphere at room temperature. The complex hydride was prepared from Mg powder and granulated or powdered Fe using a planetary mill. The phase evolution during different milling times was performed by X-rays diffraction technique. The dehydrogenation behavior of the hydride was investigated through simultaneous thermal analyses of differential scanning calorimetry and thermogravimetry coupled with mass spectrometer. The use of powdered iron as starting material promoted conversion to complex hydride at shorter milling times than when granulated iron was used, nevertheless, after 24 hours of milling the 2Mg-Fe (powdered or granulated) mixtures presented similar dehydrogenation behavior. The hydrogen absorption during milling was on average 3.2 wt. (%), however, changing the proportions of the reagents to 3Mg-Fe a Mg 2 FeH 6 -MgH 2 based nanocomposite with higher density of hydrogen (5.2 wt. (%)) was obtained.

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Effect of the nature of the starting materials on the formation of Mg2FeH6

Cited by 48 publications

References 9 publications

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

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

Mg2FeH6 Synthesis Efficiency Map

Mg2FeH6-based nanocomposites with high capacity of hydrogen storage processed by reactive milling

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