Kinetic analysis of the thermal stability of lithium silicates (Li4SiO4 and Li2SiO3)

Cruz, D. O. A.; Bulbulian, S.; Lima, Enrique; Pfeiffer, Heriberto

doi:10.1016/j.jssc.2005.12.020

Cited by 111 publications

(58 citation statements)

References 27 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%

“…This most likely is the result of the hygroscopic nature of the dried product and the consequent segregation of LiCl to material surfaces and Li loss during heating. Lithium loss through combined lithium rejection at growth interfaces and sublimation of lithium as either Li (g) , LiO (g) or Li 2 O (g) during firing, particularly above 800°C, is a commonly observed phenomena in Li bearing ceramics [42][43][44][45][46][47][48] and thus it is likely to be evident also in materials synthesised from a LiOH precursor, albeit to a notably lesser extent relative to chloride precursor derived samples.…”

Section: Xrdmentioning

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%

Section: Xrdmentioning

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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“…The needlelike structure could be produced due to the union of several Li 2 SiO 3 chains. Li 2 SiO 3 is a silicate which has a linear (SiO 3 ) 2− structure [23]. Hence, if several of these chains are linked, the needle-like structure should be formed.…”

Section: Resultsmentioning

confidence: 99%

Low Temperature Synthesis of Li2SiO3: Effect on Its Morphological and Textural Properties

Gutiérrez

Cruz

Pfeiffer³

2008

Research Letters in Materials Science

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Synthesis, at low temperature, of Li 2 SiO 3 was investigated using different Li : Si molar ratios and urea, which was used as template. This new synthesis was performed in order to look for different textural and morphological properties than those obtained usually by conventional methods in this kind of ceramics. XRD and SEM analyses showed that Li 2 SiO 3 was obtained pure and with ceramic particle morphology of hollow spheres of 2-6 μm. TEM analysis showed that those spheres were composed by needle-like particles crosslinked among them. This morphology provided a high surface area, probed by N 2 adsorption. Therefore, this method of synthesis may be used to obtain other similar ceramics and test them in different applications.

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“…Lithium metasilicate has been the topic of several studies because of their potential application as tritium breeder material into the fusion reactors [97,98] as an ionic conductor [99,100] and as a candidate for luminescent materials [101,102]. In general, Li 2 SiO 3 has been synthesized by the conventional solid-state reaction method, and only some chemical routes have been studied such as the sol-gel, microemulsion and combustion methods [103][104][105].…”

Section: Synthesis Of LI 2 Sio 3 Hollow Microspheres Via Surfactant-amentioning

confidence: 99%

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Ortíz-Landeros¹,

Gómez-Yáñez²,

López-Juárez³

et al. 2012

J Adv Ceram

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Abstract:The present article aims to give a brief overview about the advantages of the hydrothermal crystallization method for the synthesis of advanced ceramics. Emphasis is given, not only on the conventional hydrothermal crystallization, but also on some of its variants; such as ultrasound-assisted, electrochemical-assisted, microwave-assisted and surfactant-assisted hydrothermal methods which open up new opportunities for the synthesis of ceramic materials with novel properties demanded for advanced applications. In the current work the synthesis of barium titanate (BaTiO 3 ), lithium metasilicate (Li 2 SiO 3 ) and sodium-potassium niobate (Na, K)NbO 3 powders are reported as cases of study.

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Kinetic analysis of the thermal stability of lithium silicates (Li4SiO4 and Li2SiO3)

Cited by 111 publications

References 27 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

Low Temperature Synthesis of Li2SiO3: Effect on Its Morphological and Textural Properties

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

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