Structural and hydriding properties of (Mg1−xCax)Ni2 Laves phase alloys

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

doi:10.1016/s0925-8388(01)01563-8

Cited by 37 publications

(17 citation statements)

References 15 publications

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“…Lowering even more the content of Mg Terashita et al (Terashita et al, 2001) found (Mg 1-x Ca x )Ni 2 based alloys desorbing hydrogen at room temperature. They determined the hydride formation enthalpy and entropy of (Mg 0.68 Ca 0.32 )Ni 2 to be H = -37 kJ/(mol H 2 ) and S = -94 J/(mol H 2 K) respectively, which is already quite near to the envisioned target.…”

Section: Mg-based Hydridesmentioning

confidence: 97%

Thermodynamics of Metal Hydrides: Tailoring Reaction Enthalpies of Hydrogen Storage Materials

Dornheim¹

2011

Thermodynamics - Interaction Studies - Solids, Liquids and Gases

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Section: Mg-based Hydridesmentioning

confidence: 97%

Thermodynamics of Metal Hydrides: Tailoring Reaction Enthalpies of Hydrogen Storage Materials

Dornheim¹

2011

Thermodynamics - Interaction Studies - Solids, Liquids and Gases

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“…11) The maximum hydrogen capacity of ( We have tried to prevent decomposition or disproportionation of CaMg 2 with substitution of other elements for Ca or Mg. In this paper, we report on the effect of substitution of La for Ca of CaMg 2 and its hydrogenation/dehydrogenation properties.…”

Section: )mentioning

confidence: 99%

Hydrogenation Properties of CaMg<SUB>2</SUB> 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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“…Terashita et al [7] have reported that (Mg 0.68 Ca 0.32 )Ni 2 reversibly absorbed 1.4 mass% of hydrogen at 278 K with keeping the C15-type Lave phase structure. As far as we know, this is only one example the Mg based alloy reversibly absorbs hydrogen at room temperature.…”

Section: Introductionmentioning

confidence: 99%