Phase space investigation of the lithium amide halides

Rosalind A. Davies; David R. Hewett; Emma Korkiakoski; Stephen P. Thompson; Paul A. Anderson

doi:10.1016/j.jallcom.2014.12.130

Phase space investigation of the lithium amide halides

Rosalind A. Davies, David R. Hewett, Emma Korkiakoski, Stephen P. Thompson, Paul A. Anderson

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Abstract

An investigation has been carried out into the lower limits of halide incorporation in lithium amide (LiNH₂). It was found that the lithium amide iodide Li₃(NH₂)₂I was unable to accommodate any variation in stoichiometry. In contrast, some variation in stoichiometry was accommodated in Li₇(NH₂)₆Br, as shown by a decrease in unit cell volume when the bromide content was reduced. The amide chloride Li₄(NH₂)₃Cl was found to adopt either a rhombohedral or a cubic structure depending on the reaction conditions. Reduction in chloride content generally resulted in a mixture of phases, but a new rhombohedral phase with the stoichiometry Li₇(NH₂)₆Cl was observed. In comparison to LiNH₂, this new low-chloride phase exhibited similar improved hydrogen desorption properties as Li₄(NH₂)₃Cl but with a much reduced weight penalty through addition of chloride. Attempts to dope lithium amide with fluoride ions have so far proved unsuccessful.

Original language	English
Journal	Journal of Alloys and Compounds
Early online date	30 Dec 2014
DOIs	https://doi.org/10.1016/j.jallcom.2014.12.130
Publication status	E-pub ahead of print - 30 Dec 2014

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NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Alloys and Compounds. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Alloys and Compounds, DOI: 10.1016/j.jallcom.2014.12.130. Eligibility for repository checked March 2015
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title = "Phase space investigation of the lithium amide halides",

abstract = "An investigation has been carried out into the lower limits of halide incorporation in lithium amide (LiNH2). It was found that the lithium amide iodide Li3(NH2)2I was unable to accommodate any variation in stoichiometry. In contrast, some variation in stoichiometry was accommodated in Li7(NH2)6Br, as shown by a decrease in unit cell volume when the bromide content was reduced. The amide chloride Li4(NH2)3Cl was found to adopt either a rhombohedral or a cubic structure depending on the reaction conditions. Reduction in chloride content generally resulted in a mixture of phases, but a new rhombohedral phase with the stoichiometry Li7(NH2)6Cl was observed. In comparison to LiNH2, this new low-chloride phase exhibited similar improved hydrogen desorption properties as Li4(NH2)3Cl but with a much reduced weight penalty through addition of chloride. Attempts to dope lithium amide with fluoride ions have so far proved unsuccessful.",

author = "Davies, {Rosalind A.} and Hewett, {David R.} and Emma Korkiakoski and Thompson, {Stephen P.} and Anderson, {Paul A.}",

year = "2014",

month = dec,

day = "30",

doi = "10.1016/j.jallcom.2014.12.130",

language = "English",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

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T1 - Phase space investigation of the lithium amide halides

AU - Davies, Rosalind A.

AU - Hewett, David R.

AU - Korkiakoski, Emma

AU - Thompson, Stephen P.

AU - Anderson, Paul A.

PY - 2014/12/30

Y1 - 2014/12/30

N2 - An investigation has been carried out into the lower limits of halide incorporation in lithium amide (LiNH2). It was found that the lithium amide iodide Li3(NH2)2I was unable to accommodate any variation in stoichiometry. In contrast, some variation in stoichiometry was accommodated in Li7(NH2)6Br, as shown by a decrease in unit cell volume when the bromide content was reduced. The amide chloride Li4(NH2)3Cl was found to adopt either a rhombohedral or a cubic structure depending on the reaction conditions. Reduction in chloride content generally resulted in a mixture of phases, but a new rhombohedral phase with the stoichiometry Li7(NH2)6Cl was observed. In comparison to LiNH2, this new low-chloride phase exhibited similar improved hydrogen desorption properties as Li4(NH2)3Cl but with a much reduced weight penalty through addition of chloride. Attempts to dope lithium amide with fluoride ions have so far proved unsuccessful.

AB - An investigation has been carried out into the lower limits of halide incorporation in lithium amide (LiNH2). It was found that the lithium amide iodide Li3(NH2)2I was unable to accommodate any variation in stoichiometry. In contrast, some variation in stoichiometry was accommodated in Li7(NH2)6Br, as shown by a decrease in unit cell volume when the bromide content was reduced. The amide chloride Li4(NH2)3Cl was found to adopt either a rhombohedral or a cubic structure depending on the reaction conditions. Reduction in chloride content generally resulted in a mixture of phases, but a new rhombohedral phase with the stoichiometry Li7(NH2)6Cl was observed. In comparison to LiNH2, this new low-chloride phase exhibited similar improved hydrogen desorption properties as Li4(NH2)3Cl but with a much reduced weight penalty through addition of chloride. Attempts to dope lithium amide with fluoride ions have so far proved unsuccessful.

U2 - 10.1016/j.jallcom.2014.12.130

DO - 10.1016/j.jallcom.2014.12.130

M3 - Article

SN - 0925-8388

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Phase space investigation of the lithium amide halides

Abstract

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