Synthesis of lithium silicates

Pfeiffer, Heriberto; Bosch, P.; Bulbulian, S.

doi:10.1016/s0022-3115(98)00449-8

Cited by 131 publications

(70 citation statements)

References 11 publications

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“…Observed compositions of Li 2 TiO 3 existing alongside a phase mixture of Li 4 SiO 4 and Li 2 SiO 3 are similar to 3-phase compositions obtained by melt based breeder pebble processing [13] and are consistent with kinetic studies in the Li metasilicate-orthosilicate regime [45] and with studies into synthesis methods of lithium silicate powders [28,33]. The coexistence of lithium metatitanate with predominantly orthosilicate material infers compatibility between L2S and LT regions of the ternary system.…”

Section: Phase Stabilitysupporting

confidence: 82%

“…Such methods readily allow the fabrication of pebbles with well controlled geometry, density and consistency and reprocessing by melting and by wet chemical methods has further been the subject of various research efforts [21,22]. In parallel, multiple solution based syntheses for lithium metatitanate and orthosilicate have been reported to date [23][24][25][26][27][28]. Such processes generally utilise organometallic compounds and/or salts as Si, Ti and Li precursors for the synthesis of oxides of various stoichiometry.…”

mentioning

confidence: 99%

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Solution based synthesis of mixed-phase materials in the Li2TiO3–Li4SiO4 system

Hanaor

Kolb

Gan

et al. 2015

Journal of Nuclear Materials

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Abstract:As candidate tritium breeder materials for use in the ITER helium cooled pebble bed, ceramic multiphasic compounds lying in the region of the quasi-binary lithium metatitanate-lithium orthosilicate system may exhibit mechanical and physical advantages relative to single phase materials. Here we present an organometallic solution-based synthesis procedure for the low-temperature fabrication of compounds in the Li 2 TiO 3 -Li 4 SiO 4 region and investigate phase stability and transformations through temperature varied X-ray diffraction and scanning calorimetry. Results demonstrate that the metatitanate and metasilicate phases Li 2 TiO 3 and Li 2 SiO 3 readily crystallise in nanocrystalline form at temperatures below 180°C. Lithium deficiency in the region of 5% results from Li sublimation from Li 4 SiO 4 and/or from excess Li incorporation in the metatitanate phase and brings about a stoichiometry shift and product compounds with mixed lithium orthosilicate/ metasilicate content towards the Si rich region and predominantly Li 2 TiO 3 content towards the Ti rich region. Above 1150°C the transformation of monoclinic to cubic γ-Li 2 TiO 3 disordered solid-solution occurs while the melting of silicate phases indicates a likely monotectic type system with a solidus line in the region 1050°-1100°C. Synthesis procedures involving a lithium chloride precursor are not likely to be a viable option for breeder pebble synthesis as this route was found to yield materials with a more significant Li-deficiency exhibiting the crystallisation of the Li 2 TiSiO 5 phase at intermediate compositions.

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Section: Phase Stabilitysupporting

confidence: 82%

mentioning

confidence: 99%

Solution based synthesis of mixed-phase materials in the Li2TiO3–Li4SiO4 system

Hanaor

Kolb

Gan

et al. 2015

Journal of Nuclear Materials

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“…They can be prepared by various methods [1]. Their properties depend, in particular, on the presence of short-range or long-range order.…”

Section: Introductionmentioning

confidence: 99%

Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

et al. 2010

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Structure of vanadium-doped lithium disilicate, Li2Si2O5 (Ccc2 space group) is studied. This crystalline phase is obtained by annealing of the doped lithium disilicate glass for 4 h at 550• C. X-ray diffraction and X-ray absorption near-edge structure analysis indicate location of vanadium atoms at Si sites. the lattice parameters are found to increase isotropically with increasing vanadium content. the valency of vanadium ions is discussed on the basis of X-ray absorption near-edge structure results.

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“…However, most of the time, a mixture of Li 2 SiO 3 , Li 2 Si 2 O 5 , Li 4 SiO 4 , and SiO 2 were obtained [13,15,[18][19][20][21]. On the other hand, the synthesis of nanocrystalline ceramic materials imposes a challenge on the traditional solid state synthesis methods which fail to offer a sufficiently narrow size distribution and desired homogeneity at the nanometer level [22].…”

Section: Introductionmentioning

confidence: 99%

Lithium metasilicate and lithium disilicate nanomaterials: optical properties and density functional theory calculations

et al. 2013

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UV-vis and photoluminescence spectra of the hydrothermally synthesized crystalline lithium metasilicate (Li 2 SiO 3 ) and lithium disilicate (Li 2 Si 2 O 5 ) nanomaterials are studied. The intensity of the bands in the emission spectra increases with increasing reaction time in both compounds. The electronic band structure along with density of states calculated by the density functional theory (DFT) method indicates that Li 2 SiO 3 and Li 2 Si 2 O 5 have an indirect energy band gap of 4.575 and 4.776 eV respectively. The optical properties, including the dielectric, absorption, reflectivity, and energy loss spectra of the compounds, are calculated by DFT method and analyzed based on the electronic structures.

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Synthesis of lithium silicates

Cited by 131 publications

References 11 publications

Solution based synthesis of mixed-phase materials in the Li2TiO3–Li4SiO4 system

Solution based synthesis of mixed-phase materials in the Li2TiO3–Li4SiO4 system

Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

Lithium metasilicate and lithium disilicate nanomaterials: optical properties and density functional theory calculations

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