Pressure-induced structural changes in Methylamine borane and dimethylamine borane

Petra A. Szilagyi; Steven Hunter; Carole A. Morrison; Chiu C. Tang; Colin R. Pulham

doi:10.1016/j.jallcom.2017.06.174

Pressure-induced structural changes in Methylamine borane and dimethylamine borane

Petra A. Szilagyi^*, Steven Hunter, Carole A. Morrison, Chiu C. Tang, Colin R. Pulham

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

Methylamine borane and dimethylamine borane have been studied under compression to 3 GPa using Raman spectroscopy and synchrotron powder X-ray diffraction. Both undergo reversible pressure-induced structural changes in this pressure range. The structural changes in the case of methylamine borane may be indicative of a second-order phase transition, taking place between ca. 0.8-1.2 GPa, which does not result in a change of space-group symmetry. In the case of dimethylamine borane, however, a reversible, reconstructive phase transition (monoclinic -> orthorhombic) occurs below 0.7 GPa. This new high-pressure phase was successfully indexed, with a possible space group assignment of Pccn or Pbcn. (C) 2017 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	953-961
Number of pages	9
Journal	Journal of alloys and compounds
Volume	722
Early online date	17 Jun 2017
DOIs	https://doi.org/10.1016/j.jallcom.2017.06.174
Publication status	Published - 25 Oct 2017

Keywords

Hydrogen storage
Phase transition
High pressure
Synchrotron X-ray powder diffraction
HYDROGEN-STORAGE MATERIALS
X-RAY-DIFFRACTION
MAGNESIUM BOROHYDRIDE MG(BH4)(2)
AMMONIA-BORANE
CRYSTAL-STRUCTURE
CATALYTIC DEHYDROCOUPLING/DEHYDROGENATION
THERMAL-DECOMPOSITION
DIHYDROGEN BOND
AMINE-BORANES
DEHYDROGENATION

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10.1016/j.jallcom.2017.06.174

http://www.sciencedirect.com/science/article/pii/S0925838817321734?via%3Dihub

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@article{4b2bd2ee76044a0d96375675b876029c,

title = "Pressure-induced structural changes in Methylamine borane and dimethylamine borane",

abstract = "Methylamine borane and dimethylamine borane have been studied under compression to 3 GPa using Raman spectroscopy and synchrotron powder X-ray diffraction. Both undergo reversible pressure-induced structural changes in this pressure range. The structural changes in the case of methylamine borane may be indicative of a second-order phase transition, taking place between ca. 0.8-1.2 GPa, which does not result in a change of space-group symmetry. In the case of dimethylamine borane, however, a reversible, reconstructive phase transition (monoclinic -> orthorhombic) occurs below 0.7 GPa. This new high-pressure phase was successfully indexed, with a possible space group assignment of Pccn or Pbcn. (C) 2017 Elsevier B.V. All rights reserved.",

keywords = "Hydrogen storage, Phase transition, High pressure, Synchrotron X-ray powder diffraction, HYDROGEN-STORAGE MATERIALS, X-RAY-DIFFRACTION, MAGNESIUM BOROHYDRIDE MG(BH4)(2), AMMONIA-BORANE, CRYSTAL-STRUCTURE, CATALYTIC DEHYDROCOUPLING/DEHYDROGENATION, THERMAL-DECOMPOSITION, DIHYDROGEN BOND, AMINE-BORANES, DEHYDROGENATION",

author = "Szilagyi, {Petra A.} and Steven Hunter and Morrison, {Carole A.} and Tang, {Chiu C.} and Pulham, {Colin R.}",

year = "2017",

month = oct,

day = "25",

doi = "10.1016/j.jallcom.2017.06.174",

language = "English",

volume = "722",

pages = "953--961",

journal = "Journal of alloys and compounds",

issn = "0925-8388",

publisher = "Elsevier Science",

}

TY - JOUR

T1 - Pressure-induced structural changes in Methylamine borane and dimethylamine borane

AU - Szilagyi, Petra A.

AU - Hunter, Steven

AU - Morrison, Carole A.

AU - Tang, Chiu C.

AU - Pulham, Colin R.

PY - 2017/10/25

Y1 - 2017/10/25

N2 - Methylamine borane and dimethylamine borane have been studied under compression to 3 GPa using Raman spectroscopy and synchrotron powder X-ray diffraction. Both undergo reversible pressure-induced structural changes in this pressure range. The structural changes in the case of methylamine borane may be indicative of a second-order phase transition, taking place between ca. 0.8-1.2 GPa, which does not result in a change of space-group symmetry. In the case of dimethylamine borane, however, a reversible, reconstructive phase transition (monoclinic -> orthorhombic) occurs below 0.7 GPa. This new high-pressure phase was successfully indexed, with a possible space group assignment of Pccn or Pbcn. (C) 2017 Elsevier B.V. All rights reserved.

AB - Methylamine borane and dimethylamine borane have been studied under compression to 3 GPa using Raman spectroscopy and synchrotron powder X-ray diffraction. Both undergo reversible pressure-induced structural changes in this pressure range. The structural changes in the case of methylamine borane may be indicative of a second-order phase transition, taking place between ca. 0.8-1.2 GPa, which does not result in a change of space-group symmetry. In the case of dimethylamine borane, however, a reversible, reconstructive phase transition (monoclinic -> orthorhombic) occurs below 0.7 GPa. This new high-pressure phase was successfully indexed, with a possible space group assignment of Pccn or Pbcn. (C) 2017 Elsevier B.V. All rights reserved.

KW - Hydrogen storage

KW - Phase transition

KW - High pressure

KW - Synchrotron X-ray powder diffraction

KW - HYDROGEN-STORAGE MATERIALS

KW - X-RAY-DIFFRACTION

KW - MAGNESIUM BOROHYDRIDE MG(BH4)(2)

KW - AMMONIA-BORANE

KW - CRYSTAL-STRUCTURE

KW - CATALYTIC DEHYDROCOUPLING/DEHYDROGENATION

KW - THERMAL-DECOMPOSITION

KW - DIHYDROGEN BOND

KW - AMINE-BORANES

KW - DEHYDROGENATION

U2 - 10.1016/j.jallcom.2017.06.174

DO - 10.1016/j.jallcom.2017.06.174

M3 - Article

VL - 722

SP - 953

EP - 961

JO - Journal of alloys and compounds

JF - Journal of alloys and compounds

SN - 0925-8388

ER -

Pressure-induced structural changes in Methylamine borane and dimethylamine borane

Abstract

Keywords

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