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Luo Q, Gu QF, Zhang JY, et al. Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound. Sci Rep. 2015;5:15385doi: 10.1038/srep15385.
Luo, Q., Gu, Q. F., Zhang, J. Y., Chen, S. L., Chou, K. C., & Li, Q. (2015). Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound. Scientific reports, 515385. https://doi.org/10.1038/srep15385
Luo, Qun, et al. "Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound." Scientific reports vol. 5 (2015): 15385. doi: https://doi.org/10.1038/srep15385
Luo Q, Gu QF, Zhang JY, Chen SL, Chou KC, Li Q. Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound. Sci Rep. 2015 Oct 16;5:15385. doi: 10.1038/srep15385. PMID: 26471964; PMCID: PMC4607946.
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Sci Rep. 2015 Oct 16;5:15385. doi: 10.1038/srep15385.

Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound.

Scientific reports

Qun Luo, Qin-Fen Gu, Jie-Yu Zhang, Shuang-Lin Chen, Kuo-Chih Chou, Qian Li

Affiliations

  1. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, China.
  2. Australian Synchrotron, 800 Blackburn Rd, Clayton 3168, Australia.
  3. CompuTherm, LLC, Madison, WI 53719, USA.
  4. Institute of Genomic Material, Shanghai University, Shanghai 200444, China.

PMID: 26471964 PMCID: PMC4607946 DOI: 10.1038/srep15385

Abstract

In order to find out the optimal composition of novel Nd-Mg-Ni alloys for hydrogen storage, the isothermal section of Nd-Mg-Ni system at 400 °C is established by examining the equilibrated alloys. A new ternary compound Nd4Mg80Ni8 is discovered in the Mg-rich corner. It has the crystal structure of space group I41/amd with lattice parameters of a = b = 11.2743(1) Å and c = 15.9170(2) Å, characterized by the synchrotron powder X-ray diffraction (SR-PXRD). High-resolution transmission electron microscopy (HR-TEM) is used to investigate the microstructure of Nd4Mg80Ni8 and its hydrogen-induced microstructure evolution. The hydrogenation leads to Nd4Mg80Ni8 decomposing into NdH2.61-MgH2-Mg2NiH0.3 nanocomposites, where the high density phase boundaries provide a great deal of hydrogen atoms diffusion channels and nucleation sites of hydrides, which greatly enhances the hydriding/dehydriding (H/D) properties. The Nd4Mg80Ni8 exhibits a good cycle ability. The kinetic mechanisms of H/D reactions are studied by Real Physical Picture (RPP) model. The rate controlling steps are diffusion for hydriding reaction in the temperature range of 100 ~ 350 °C and surface penetration for dehydriding reaction at 291 ~ 347 °C. In-situ SR-PXRD results reveal the phase transformations of Mg to MgH2 and Mg2Ni to Mg2NiH4 as functions of hydrogen pressure and hydriding time.

References

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  3. Inorg Chem. 2013 Dec 2;52(23):13289-91 - PubMed

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