Diffusion of lithium-6 isotopes in lithium aluminate ceramics using neutron depth profiling

McWhinney, Hylton; James, William D.; Schweikert, E. A.; Williams, John R.; Hollenberg, G.W.; Welsh, J. F.; Sereatan, Washington

doi:10.1016/0022-3115(93)90428-2

Cited by 8 publications

(11 citation statements)

References 6 publications

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“…It has been an intensively studied for its possible application as an electrolyte in fuel cells [2], the blanket for breeder nuclear fusion reactor [3], or an appropriate substrate for the heteroepitaxial growth of GaN [4]. Due to the high Li content, low density (2.75 g/cm 3 ) and suitable nuclear reaction, it can be considered as a suitable host matrix for neutron scintillator.…”

Section: Neutron Scintillatorsmentioning

confidence: 99%

Modifications of micro-pulling-down method for the growth of selected Li-containing crystals for neutron scintillator and VUV scintillation crystals

Pejchal

Fujimoto

Chani

et al. 2012

Journal of Crystal Growth

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Section: Neutron Scintillatorsmentioning

confidence: 99%

Modifications of micro-pulling-down method for the growth of selected Li-containing crystals for neutron scintillator and VUV scintillation crystals

Pejchal

Fujimoto

Chani

et al. 2012

Journal of Crystal Growth

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“…Therefore, new candidate materials for neutron scintillator applications are still required. LiAlO 2 has been an intensively studied material for its possible application as an electrolyte in fuel cells [6], the blanket for breeder nuclear fusion reactor [7], or a promising substrate for the heteroepitaxial growth of GaN (see Ref. [8] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Crystal growth and luminescence properties of Ti-doped LiAlO2 for neutron scintillator

Pejchal

Fujimoto

Chani

et al. 2011

Journal of Crystal Growth

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“…However, in addition to the increase in local order, the reduction in fwhm may also be attributed to an increase in Li + ion mobility. The mobility of Li + ions − implies that OH – ions are simultaneously mobile, as was found in OH – based LDH electrolytes and molecular dynamics simulations of jump diffusion in LDH materials . All spectra are well fit by a single Gaussian line shape with no evidence of a superimposed broad signal .…”

Section: Resultsmentioning

confidence: 52%

Unraveling Gibbsite Transformation Pathways into LiAl-LDH in Concentrated Lithium Hydroxide

Graham

Zhang

et al. 2019

Inorg. Chem.

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Gibbsite (α-Al(OH) 3 ) transformation into layered double hydroxides, such as lithium aluminum hydroxide dihydrate (LiAl-LDH), is generally thought to occur by solidstate intercalation of Li + , in part because of the intrinsic structural similarities in the quasi-2D octahedral Al 3+ frameworks of these two materials. However, in caustic environments where gibbsite solubility is high relative to LiAl-LDH, a dissolutionreprecipitation pathway is conceptually enabled, proceeding via precipitation of tetrahedral (T d ) aluminate anions (Al(OH) 4 − ) at concentrations held below 150 mM by rapid LiAl-LDH nucleation and growth. In this case, the relative importance of solid-state versus solution pathways is unknown because it requires in situ techniques that can distinguish Al 3+ in solution and in the solid phase (gibbsite and LiAl-LDH), simultaneously. Here, we examine this transformation in partially deuterated LiOH solutions, using multinuclear, magic angle spinning, and high field nuclear magnetic resonance spectroscopy ( 27 Al and 6 Li MAS NMR), with supporting X-ray diffraction and scanning electron microscopy. In situ 27 Al MAS NMR captured the emergence and decline of metastable aluminate ions, consistent with dissolution of gibbsite and formation of LiAl-LDH by precipitation. High field, ex situ 6 Li NMR of the the progressively reacted solids resolved an O h Li + resonance that narrowed during the transformation. This is likely due to increasing local order in LiAl-LDH, correlating well with observations in high field, ex situ 27 Al MAS NMR spectra, where a comparatively narrow LiAl-LDH O h 27 Al resonance emerges upfield of gibbsite resonances. No intermediate pentahedral Al 3+ is resolvable. Quantification of aluminate ion concentrations suggests a prominent role for the solution pathway in this system, a finding that could help improve strategies for manipulating Al 3+ concentrations in complex caustic waste streams, such as those being proposed to treat the high-level nuclear waste stored at the U.S. Department of Energy's Hanford Nuclear Reservation in Washington State, USA.

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Diffusion of lithium-6 isotopes in lithium aluminate ceramics using neutron depth profiling

Cited by 8 publications

References 6 publications

Modifications of micro-pulling-down method for the growth of selected Li-containing crystals for neutron scintillator and VUV scintillation crystals

Modifications of micro-pulling-down method for the growth of selected Li-containing crystals for neutron scintillator and VUV scintillation crystals

Crystal growth and luminescence properties of Ti-doped LiAlO2 for neutron scintillator

Unraveling Gibbsite Transformation Pathways into LiAl-LDH in Concentrated Lithium Hydroxide

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