Crystal structure analysis in the dehydrogenation process of Mg(NH 2)2-LiH system

Tatsuo Noritake; Masakazu Aoki; Shin Ichi Towata; Yuko Nakamori; Shin Ichi Orimo

doi:10.1557/proc-0971-z07-05

Crystal structure analysis in the dehydrogenation process of Mg(NH ₂)₂-LiH system

Tatsuo Noritake, Masakazu Aoki, Shin Ichi Towata, Yuko Nakamori, Shin Ichi Orimo

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

3 Citations (Scopus)

Abstract

Mg(NH₂)₂-LiH system which have the properties of reversible hydrogenation and dehydrogenation is one of the promising candidates for new hydrogen storage materials. For understanding of the reversible reaction mechanism, we investigated the crystal structure changes in 3Mg(NH ₂)₂-12LiH system using the pressure-composition (p-c) isotherm measurement and synchrotron X-ray diffraction. The sample was prepared by the hydrogenation of Mg₃N₂ + 4Li₃N. At the several dehydrogenation stages of the p-c isotherm measurement at temperature 523 K, the sample was taken out and X-ray diffraction measurement was performed. By the amount of desorbed hydrogen, the reaction was expressed as the following formula, Mg(NH₂)₂ + 4LiH - Li_xMg(NH ₂)_2-x(NH)_x + (4-x)LiH + xH₂ (x = 0-2). The crystal structures of Li_xMg(NH₂(NH)_x, similar to CaF₂-type one, formed during the dehydrogenation reaction were determined by Rietveld analysis. As a result, it is considered that the dehydrogenation process might relate to the diffusion of Li⁺ ion in cation sites of Mg(NH₂)₂.

Original language	English
Title of host publication	Hydrogen Storage Technologies
Publisher	Materials Research Society
Pages	65-69
Number of pages	5
ISBN (Print)	9781604234206
DOIs	https://doi.org/10.1557/proc-0971-z07-05
Publication status	Published - 2006
Event	2006 MRS Fall Meeting - Boston, MA, United States Duration: 2006 Nov 27 → 2006 Dec 1

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	971
ISSN (Print)	0272-9172

Conference

Conference	2006 MRS Fall Meeting
Country/Territory	United States
City	Boston, MA
Period	06/11/27 → 06/12/1

Access to Document

10.1557/proc-0971-z07-05

Cite this

@inproceedings{cda0a25178634e29a4fd1f461984be04,

title = "Crystal structure analysis in the dehydrogenation process of Mg(NH 2)2-LiH system",

abstract = "Mg(NH2)2-LiH system which have the properties of reversible hydrogenation and dehydrogenation is one of the promising candidates for new hydrogen storage materials. For understanding of the reversible reaction mechanism, we investigated the crystal structure changes in 3Mg(NH 2)2-12LiH system using the pressure-composition (p-c) isotherm measurement and synchrotron X-ray diffraction. The sample was prepared by the hydrogenation of Mg3N2 + 4Li3N. At the several dehydrogenation stages of the p-c isotherm measurement at temperature 523 K, the sample was taken out and X-ray diffraction measurement was performed. By the amount of desorbed hydrogen, the reaction was expressed as the following formula, Mg(NH2)2 + 4LiH - LixMg(NH 2)2-x(NH)x + (4-x)LiH + xH2 (x = 0-2). The crystal structures of LixMg(NH2(NH)x, similar to CaF2-type one, formed during the dehydrogenation reaction were determined by Rietveld analysis. As a result, it is considered that the dehydrogenation process might relate to the diffusion of Li+ ion in cation sites of Mg(NH2)2.",

author = "Tatsuo Noritake and Masakazu Aoki and Towata, {Shin Ichi} and Yuko Nakamori and Orimo, {Shin Ichi}",

year = "2006",

doi = "10.1557/proc-0971-z07-05",

language = "English",

isbn = "9781604234206",

series = "Materials Research Society Symposium Proceedings",

publisher = "Materials Research Society",

pages = "65--69",

booktitle = "Hydrogen Storage Technologies",

note = "2006 MRS Fall Meeting ; Conference date: 27-11-2006 Through 01-12-2006",

}

Noritake, T, Aoki, M, Towata, SI, Nakamori, Y & Orimo, SI 2006, Crystal structure analysis in the dehydrogenation process of Mg(NH ₂)₂-LiH system. in Hydrogen Storage Technologies. Materials Research Society Symposium Proceedings, vol. 971, Materials Research Society, pp. 65-69, 2006 MRS Fall Meeting, Boston, MA, United States, 06/11/27. https://doi.org/10.1557/proc-0971-z07-05

Crystal structure analysis in the dehydrogenation process of Mg(NH ₂)₂-LiH system. / Noritake, Tatsuo; Aoki, Masakazu; Towata, Shin Ichi et al.
Hydrogen Storage Technologies. Materials Research Society, 2006. p. 65-69 (Materials Research Society Symposium Proceedings; Vol. 971).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Crystal structure analysis in the dehydrogenation process of Mg(NH 2)2-LiH system

AU - Noritake, Tatsuo

AU - Aoki, Masakazu

AU - Towata, Shin Ichi

AU - Nakamori, Yuko

AU - Orimo, Shin Ichi

PY - 2006

Y1 - 2006

N2 - Mg(NH2)2-LiH system which have the properties of reversible hydrogenation and dehydrogenation is one of the promising candidates for new hydrogen storage materials. For understanding of the reversible reaction mechanism, we investigated the crystal structure changes in 3Mg(NH 2)2-12LiH system using the pressure-composition (p-c) isotherm measurement and synchrotron X-ray diffraction. The sample was prepared by the hydrogenation of Mg3N2 + 4Li3N. At the several dehydrogenation stages of the p-c isotherm measurement at temperature 523 K, the sample was taken out and X-ray diffraction measurement was performed. By the amount of desorbed hydrogen, the reaction was expressed as the following formula, Mg(NH2)2 + 4LiH - LixMg(NH 2)2-x(NH)x + (4-x)LiH + xH2 (x = 0-2). The crystal structures of LixMg(NH2(NH)x, similar to CaF2-type one, formed during the dehydrogenation reaction were determined by Rietveld analysis. As a result, it is considered that the dehydrogenation process might relate to the diffusion of Li+ ion in cation sites of Mg(NH2)2.

AB - Mg(NH2)2-LiH system which have the properties of reversible hydrogenation and dehydrogenation is one of the promising candidates for new hydrogen storage materials. For understanding of the reversible reaction mechanism, we investigated the crystal structure changes in 3Mg(NH 2)2-12LiH system using the pressure-composition (p-c) isotherm measurement and synchrotron X-ray diffraction. The sample was prepared by the hydrogenation of Mg3N2 + 4Li3N. At the several dehydrogenation stages of the p-c isotherm measurement at temperature 523 K, the sample was taken out and X-ray diffraction measurement was performed. By the amount of desorbed hydrogen, the reaction was expressed as the following formula, Mg(NH2)2 + 4LiH - LixMg(NH 2)2-x(NH)x + (4-x)LiH + xH2 (x = 0-2). The crystal structures of LixMg(NH2(NH)x, similar to CaF2-type one, formed during the dehydrogenation reaction were determined by Rietveld analysis. As a result, it is considered that the dehydrogenation process might relate to the diffusion of Li+ ion in cation sites of Mg(NH2)2.

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