Synthesis and hydriding/dehydriding properties of amorphous Mg2Ni1.9M0.1 alloys mechanically alloyed from Mg2Ni0.9M0.1 (M=none, Ni, Ca, La, Y, Al, Si, Cu and Mn) and Ni powder

Terashita, Naoyoshi; Takahashi, Masaki; Kobayashi, Kazuo; Sasai, Takashi; Akiba, Etsuo

doi:10.1016/s0925-8388(99)00408-9

Cited by 40 publications

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References 11 publications

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“…To lower hydrogen desorption temperature, amorphization and substitution of third elements for Mg or Ni of Mg 2 Ni in order to changes hydrogenation/dehydrogenation properties is performed briskly. 2,3) However, the satisfying result has not been obtained yet.…”

Section: Introductionmentioning

confidence: 90%

Hydrogenation Properties of CaMg2 Based Alloys

Terashita

Akiba

2004

Mater. Trans.

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Binary C14 Laves phase alloy CaMg 2 is expected to absorb hydrogen more than 6 mass%, when the H/M ratio reaches 2. We have found that the binary CaMg 2 did not absorb hydrogen at ambient temperature and hydrogen pressure but Ni added CaMg 1:8 Ni 0:2 which is also C14 Laves phase absorbed 6.0 mass% of hydrogen at room temperature. CaMg 1:8 Ni 0:2 formed hydrides of Mg and Ca, and the C14 Laves phase disappeared. Hydrogen desorption was not observed from hydrogenated CaMg 1:8 Ni 0:2 . (Ca 0:8 La 0:2 )Mg 2:2 Ni 0:1 absorbed 5.1 mass% hydrogen and H/M ratio reached 1.8 at room temperature. After hydrogenation, the lattice of the Laves phase expands 4% in a-axis and 3% in c-axis. The volume expansion is 13%. The Laves phase structure is kept and hydrogen was absorbed in the lattice. The hydride of (Ca 0:8 La 0:2 )Mg 2:2 Ni 0:1 decomposed from 470 K with increase at temperature and hydrogen was released from the products of decomposition from 610 K.

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Section: Introductionmentioning

confidence: 90%

Hydrogenation Properties of CaMg2 Based Alloys

Terashita

Akiba

2004

Mater. Trans.

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“…Most of them reversibly absorb and desorb hydrogen at ambient temperature. 6,7) The maximum hydrogen content of (Mg 0.67 Ca 0.33 )Ni 2 is 1.4 mass% (H/M = 0.7) under hydrogen pressure of 4 MPa at temperature of 278 K. We have improved plateau flatness and cycle durability of (Mg 0.67 Ca 0.33 )Ni 2 C15-type Laves phase by substituting Y for a part of Ca. 8) Hydrogenation properties of the ternary compounds MgRENi 4 (RE = La, Nd and Gd) have been reported by several groups.…”

Section: Introductionmentioning

confidence: 94%

Hydrogenation Properties of Ternary Intermetallic Compounds Mg2−xPrxNi4

et al. 2012

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“…3,4) Attempts to improve the reaction kinetics of MgH 2 by mechanical alloying have also been performed. However, the satisfying results have not been obtained yet.…”

Section: Introductionmentioning

confidence: 99%

Hydriding Properties of (Mg1−xMx)Ni2 C15-Type Laves Phase Alloys

Terashita

Akiba

2006

Mater. Trans.

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Mg-based Laves phase alloys (Mg 0:7 M 0:3 )Ni 2 , where M elements were Ca, La, Ce, Pr, Nd and Gd were successfully developed. The alloys can be synthesized by a conventional induction melting and annealing method from intermetallic compounds MgNi 2 and MNi 2 as a source of Mg, Ni and M elements. The crystal structures of the major phases of annealed (Mg 0:7 M 0:3 )Ni 2 alloys were C15-type for M ¼ Ca and C15 b -type for M ¼ La, Ce, Pr, Nd and Gd Laves structures, respectively. In the alloys except M ¼ Ce, hydrogenation and dehydrogenation reversibly occurred. The maximum hydrogen contents of the alloys are 1.2-1.6 mass% (H/M:0.6-0.8) under hydrogen pressure of 5 MPa at 243-273 K. As the results of measurements of p-c isotherms, in the case of the M ¼ Pr and Nd, two step plateaus were clearly observed. After a few hydrogenation/dehydrogenation cycles, the alloys kept C15-type or C15 b -type Laves structures without hydrogen-induced amorphization, disproportionation and decomposition.

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Synthesis and hydriding/dehydriding properties of amorphous Mg2Ni1.9M0.1 alloys mechanically alloyed from Mg2Ni0.9M0.1 (M=none, Ni, Ca, La, Y, Al, Si, Cu and Mn) and Ni powder

Cited by 40 publications

References 11 publications

Hydrogenation Properties of CaMg<SUB>2</SUB> Based Alloys

Hydrogenation Properties of CaMg<SUB>2</SUB> Based Alloys

Hydrogenation Properties of Ternary Intermetallic Compounds Mg<sub>2−</sub><i><sub>x</sub></i>Pr<i><sub>x</sub></i>Ni<sub>4</sub>

Hydriding Properties of (Mg<SUB>1−<I>x</I></SUB>M<I><SUB>x</SUB></I>)Ni<SUB>2</SUB> C15-Type Laves Phase Alloys

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Synthesis and hydriding/dehydriding properties of amorphous Mg2Ni1.9M0.1 alloys mechanically alloyed from Mg2Ni0.9M0.1 (M=none, Ni, Ca, La, Y, Al, Si, Cu and Mn) and Ni powder

Cited by 40 publications

References 11 publications

Hydrogenation Properties of CaMg<SUB>2</SUB> Based Alloys

Hydrogenation Properties of CaMg<SUB>2</SUB> Based Alloys

Hydrogenation Properties of Ternary Intermetallic Compounds Mg<sub>2&minus;</sub><i><sub>x</sub></i>Pr<i><sub>x</sub></i>Ni<sub>4</sub>

Hydriding Properties of (Mg<SUB>1&minus;<I>x</I></SUB>M<I><SUB>x</SUB></I>)Ni<SUB>2</SUB> C15-Type Laves Phase Alloys

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Hydrogenation Properties of Ternary Intermetallic Compounds Mg<sub>2−</sub><i><sub>x</sub></i>Pr<i><sub>x</sub></i>Ni<sub>4</sub>

Hydriding Properties of (Mg<SUB>1−<I>x</I></SUB>M<I><SUB>x</SUB></I>)Ni<SUB>2</SUB> C15-Type Laves Phase Alloys