Effect of Si substitution for Al on the structural and hydrogenation properties of the Zintl phase alloy SrAl2

Zhu, Yunfeng; Zhang, Wei; Feng, Huan; Li, Liquan

doi:10.1016/j.jallcom.2009.05.130

Cited by 7 publications

(8 citation statements)

References 20 publications

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“…Especially, the hydrogenation of the SrAl 2 Zintl phase has led to the first reported Zintl phase hydride SrAl 2 H 2 , where H is part of the polyanion. [12][13][14][15] The hydrogen content of this hydride is however limited to 1.4 wt%.…”

Section: Introductionmentioning

confidence: 98%

Hydrogenation properties of KSi and NaSi Zintl phases

Tang

Chotard

Raybaud

et al. 2012

Phys. Chem. Chem. Phys.

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The recently reported KSi-KSiH(3) system can store 4.3 wt% of hydrogen reversibly with slow kinetics of several hours for complete absorption at 373 K and complete desorption at 473 K. From the kinetics measured at different temperatures, the Arrhenius plots give activation energies (E(a)) of 56.0 ± 5.7 kJ mol(-1) and 121 ± 17 kJ mol(-1) for the absorption and desorption processes, respectively. Ball-milling with 10 wt% of carbon strongly improves the kinetics of the system, i.e. specifically the initial rate of absorption becomes about one order of magnitude faster than that of pristine KSi. However, this fast absorption causes a disproportionation into KH and K(8)Si(46), instead of forming the KSiH(3) hydride from a slow absorption. This disproportionation, due to the formation of stable KH, leads to a total loss of reversibility. In a similar situation, when the pristine Zintl NaSi phase absorbs hydrogen, it likewise disproportionates into NaH and Na(8)Si(46), indicating a very poorly reversible reaction.

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Section: Introductionmentioning

confidence: 98%

Hydrogenation properties of KSi and NaSi Zintl phases

Tang

Chotard

Raybaud

et al. 2012

Phys. Chem. Chem. Phys.

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“…Attempts to extend the experimental investigation to the Ca-and Sr-analogues were not satisfactory due to larger amounts of impurity phases. This was recently confirmed by Zhu et al who tried to synthesize and hydride a corresponding SrAl 2−x Si x H 2−x series in between SrAl 2 and SrAlSi [14]. They found that hydrogenation lead to various mixtures of SrAlSi, SrAlSiH, SrAl 2 , SrH 2 and SrAl 4 phases.…”

Section: Introductionmentioning

confidence: 58%

A series of BaAl2−xSixH2−x (0.4<x<1.6) hydrides with compositions and structures in between BaSi2 and BaAl2H2

Moser¹,

Häußermann²,

Utsumi³

et al. 2010

Journal of Alloys and Compounds

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“…The scan presents 5 reflexes 000 n for SrAlSi confirming that the film is epitaxial with the layered structure parallel to the surface. The reflexes determine the lattice parameter c to be 4.7370(15) Å, slightly below the values 4.7442(9) Å [ 43 ] and 4.7458(1) Å [ 44 ] for bulk SrAlSi. There existed some controversy in XRD studies of SrAlSi: [ 20,21 ] the inferred structure admitted random distribution of Al and Si within the anionic layer whereas calculations gave preference to the ordered structure (as in Figure 1a).…”

Section: Resultsmentioning

confidence: 80%

Thickness‐Dependent Superconductivity in a Layered Electride on Silicon

Averyanov

Sokolov

Parfenov

et al. 2023

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Layered materials exhibit a plethora of fascinating properties. The challenge is to make the materials into epitaxial films, preferably integrated with mature technological platforms to facilitate their potential applications. Progress in this direction can establish the film thickness as a valuable parameter to control various phenomena, superconductivity in particular. Here, a synthetic route to epitaxial films of SrAlSi, a layered superconducting electride, on silicon is designed. A set of films ranging in thickness is synthesized employing a silicene‐based template. Their structure and superconductivity are explored by a combination of techniques. Two regimes of TC dependence on the film thickness are identified, the coherence length being the crossover parameter. The results can be extended to syntheses of other honeycomb‐lattice ternary compounds on Si or Ge exhibiting superconducting, magnetic, and other properties.

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Effect of Si substitution for Al on the structural and hydrogenation properties of the Zintl phase alloy SrAl2

Cited by 7 publications

References 20 publications

Hydrogenation properties of KSi and NaSi Zintl phases

Hydrogenation properties of KSi and NaSi Zintl phases

A series of BaAl2−xSixH2−x (0.4<x<1.6) hydrides with compositions and structures in between BaSi2 and BaAl2H2

Thickness‐Dependent Superconductivity in a Layered Electride on Silicon

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