Etude comparative des hydro- et deuteroaluminates de lithium LiAlH4 et LiAlD4 II - Spectres de diffusion raman des composes solides

Bureau, Jean-Claude; Bonnetot, Β.; Claudy, P.; Eddaoudi, Hassan

doi:10.1016/0025-5408(85)90088-1

Cited by 13 publications

(10 citation statements)

References 5 publications

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“…2. The Raman spectrum for LiAlH 4 is in good agreement with the previous work [21]. The Al-H stretching and the Al-H-M bending vibrations are clearly observed for each spectrum.…”

Section: Raman Spectrum For Malh 4 (M = LI Na K)supporting

confidence: 87%

Raman scattering and lattice stability of NaAlH4 and Na3AlH6

Yukawa

Morisaku

et al. 2007

Journal of Alloys and Compounds

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“…2. The Raman spectrum for LiAlH 4 is in good agreement with the previous work [21]. The Al-H stretching and the Al-H-M bending vibrations are clearly observed for each spectrum.…”

Section: Raman Spectrum For Malh 4 (M = LI Na K)supporting

confidence: 87%

Raman scattering and lattice stability of NaAlH4 and Na3AlH6

Yukawa

Morisaku

et al. 2007

Journal of Alloys and Compounds

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“…The complete description of the various vibrational modes can be useful for an in situ vibrational spectroscopy study of the decomposition of LiAlH 4 . The first complete vibrational assignment for LiAlH 4 was reported by Bureau et al in 1985. The spectrum reported in this study provides the second known complete vibrational assignment for LiAlH 4 (from 80 to 2200 cm -1 ).…”

Section: Resultsmentioning

confidence: 99%

Pressure-Induced Phase Transformations in LiAlH₄

Chellappa¹,

Chandra²,

Gramsch³

et al. 2006

J. Phys. Chem. B

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The pressure-induced phase transformations in pure LiAlH4 have been studied using in situ Raman spectroscopy up to 7 GPa. The analyses of Raman spectra reveal a phase transition at approximately 3 GPa from the ambient pressure monoclinic alpha-LiAlH4 phase (P2(1)/c) to a high pressure phase (beta-LiAlH4, reported recently to be monoclinic with space group I4(1)/b) having a distorted [AlH4]- tetrahedron. The Al-H stretching mode softens and shifts dramatically to lower frequencies beyond the phase transformation pressure. The high pressure beta-LiAlH4 phase was pressure quenchable and can be recovered at lower pressures ( approximately 1.2 GPa). The Al-H stretching mode in the quenched state further shifts to lower frequencies, suggesting a weakening of the Al-H bond.

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“…We suggest that the disorder resulting in the HT-phase of LiBH 4 is induced by the increasing mobility (delocalization) of Li atoms below the phase transition temperature being in line with results from measurements of the Pair Distribution Function from the total scattering from neutron diffraction experiments, 40 and first-principles molecular dynamics simulations. 23 LiAlH 4 shows also several pressure or temperature induced phase transitions, 37,38 although this is not the main focus of this paper.…”

Section: Discussionmentioning

confidence: 98%

“…36). Bureau et al, 37 Hagemann et al 36 and Chellappa et al 38 have extensively studied and assigned the corresponding Raman transitions.…”

Section: Dynamics In Lithium Alanatementioning

confidence: 99%

Mobility and dynamics in the complex hydrides LiAlH4 and LiBH4

et al. 2011

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The dynamics and bonding of the complex hydrides LiBH4 and LiAlH4 have been investigated by vibrational spectroscopy. The combination of infrared, Raman, and inelastic neutron scattering (INS) spectroscopies on hydrided and deuterided samples reveals a complete picture of the dynamics of the BH4- and AlH4 anions respectively as well as the lattice. The straightforward interpretation of isotope effects facilitates tracer diffusion experiments revealing the diffusion coefficients of hydrogen containing species in LiBH4, and LiAlH4. LiBH4 exchanges atomic hydrogen starting at 200 degrees C. Despite having an iso-electronic structure, the mobility of hydrogen in LiAlH4 is different from that of LiBH4. Upon ball-milling of LiAlH4 and LiAlD4, hydrogen is exchanged with deuterium even at room temperature. However, the exchange reaction competes with the decomposition of the compound. The diffusion coefficients of the alanate and borohydride have been found to be D approximately equal 7 x 10(-14) m2 s(-1) at 473 K and D approximately equal 5 x 10(-16) m2 s(-1) at 348 K, respectively. The BH4 ion is easily exchanged by other ions such as I- or by NH2-. This opens the possibility of tailoring physical properties such as the temperature of the phase transition linked to the Li-ion conductivity in LiBH4 as measured by nuclear magnetic resonance and Raman spectroscopy. Temperature dependent Raman measurements on diffusion gradient samples Li(BH4)1-cIc demonstrate that increasing temperature has a similar impact to increasing the iodide concentration c: the system is driven towards the high-temperature phase of LiBH4. The influence of anion exchange on the hydrogen sorption properties is limited, though. For example, Li4(BH4)(NH2)3 does not exchange hydrogen easily even in the melt.

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Etude comparative des hydro- et deuteroaluminates de lithium LiAlH4 et LiAlD4 II - Spectres de diffusion raman des composes solides

Cited by 13 publications

References 5 publications

Raman scattering and lattice stability of NaAlH4 and Na3AlH6

Raman scattering and lattice stability of NaAlH4 and Na3AlH6

Pressure-Induced Phase Transformations in LiAlH₄

Mobility and dynamics in the complex hydrides LiAlH4 and LiBH4

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Etude comparative des hydro- et deuteroaluminates de lithium LiAlH4 et LiAlD4 II - Spectres de diffusion raman des composes solides

Cited by 13 publications

References 5 publications

Raman scattering and lattice stability of NaAlH4 and Na3AlH6

Raman scattering and lattice stability of NaAlH4 and Na3AlH6

Pressure-Induced Phase Transformations in LiAlH4

Mobility and dynamics in the complex hydrides LiAlH4 and LiBH4

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Product

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Pressure-Induced Phase Transformations in LiAlH₄