On the preparation of the lithium siclicates series from Li2SiO3 to Li8SiO6 in alcoholic media

Vollath, D.; Wedemeyer, H.

doi:10.1016/s0022-3115(86)80060-5

Cited by 21 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mean grain sizes are estimated to be about 1.5 and 2 urn for the lLi:Ti and the 2Li:Si ceramics, respectively. The observed microstructures are in agreement with those reported in the literature for similar sintering conditions [22,23]. On the other hand, a bimodal grain size distribution is observed for the 3Li:Si sample, where grains with an average grain size of 0.15 urn are shown decorating the 6 urn sized grains.…”

Section: Microstructural Featuressupporting

confidence: 91%

D-depth profiling in as-implanted and annealed Li-based breeder blanket ceramics

Carella

González

González-Arrabal

2013

Journal of Nuclear Materials

View full text Add to dashboard Cite

HIGHLIGHTS• Three solid breeder blanket candidates were D-implanted and characterized by NRA at different annealing temperatures.• Lithium containing silicate and titanate ceramics with ratio 2Li:Si, 3Li:Si and lLi:Ti were fabricated.• The fabricated ceramics exhibit different porosity, grain size and density.• The ceramics were implanted with D: a complete outgas was observed at T > 200 °C.• Surface is crucial for the release kinetics and grain boundaries represent an alternative path to porous for diffusion. ABSTRACTIn future power plants (i.e. DEMO), the nuclear fusion of hydrogen isotopes will be used for energy production. The behaviour of hydrogen isotopes in lithium-enriched ceramics for breeder blankets (BBs) is one of the most important items to be understood.In this paper we present the chemical, microstructural and morphological features of Li 4 Si0 4 , Li 2 Ti0 3 and a third ceramic candidate with a higher Li:Si proportion (3:1), implanted with D at an energy of 100 keV and at room temperature at a fluence of 1 x 10 17 cm 2 . The D depth-profile in as-implanted and annealed ceramics (at T < 200 °C) was characterised by Resonance Nuclear Reaction Analysis (RNRA). The RNRA data indicate that the total amount of D is retained at room temperature, while annealing at 100 °C promotes D release and annealing at T > 150 °C drives D to completely desorb from all the studied ceramics. D release will be discussed as a function of the microstructurural and morphological features of each material.

show abstract

Section: Microstructural Featuressupporting

confidence: 91%

D-depth profiling in as-implanted and annealed Li-based breeder blanket ceramics

Carella

González

González-Arrabal

2013

Journal of Nuclear Materials

View full text Add to dashboard Cite

show abstract

“…Apart from Li 4 SiO 4 , other lithium silicates could be tested as CO 2 captors. Lithium oxosilicate (Li 8 SiO 6 ) [36][37][38][39] has not been fully analyzed in any scientic eld, although it may present interesting properties due to its high Li : Si molar ratio. A few researchers have prepared Li 8 SiO 6 via the solid-state reaction of Li 2 O and SiO 2 , doping it with transition elements and analyzing its crystallographic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the CO2 chemisorption reaction mechanism in lithium oxosilicate (Li8SiO6): a new option for high-temperature CO2 capture

2013

View full text Add to dashboard Cite

Lithium oxosilicate (Li 8 SiO 6 ) was successfully synthesized via a solid-state reaction. The sample's structure and microstructure were characterized using X-ray diffraction, scanning electron microscopy and N 2 adsorption. The CO 2 chemisorption capacity was evaluated dynamically and isothermally. Li 8 SiO 6 was found to chemisorb CO 2 over a wide temperature range with a maximum weight increase of 52.1 wt%, which corresponds to 11.8 mmol CO 2 per gram ceramic. Using different thermogravimetric analyses with some structural and microstructural analyses, a CO 2 chemisorption mechanism could be proposed, and the chemical species formed (Li 4 SiO 4 , Li 2 SiO 3 and Li 2 CO 3 ) during the CO 2 capture process in Li 8 SiO 6 could be elucidated. The kinetic parameter values (k) obtained for the Li 8 SiO 6 -CO 2 reaction were higher than the k values previously reported for the Li 4 SiO 4 -CO 2 reaction system. Additionally, DH ‡ was found to be 53.1 kJ mol À1 . According to these results, the Li 8 SiO 6 -CO 2 chemisorption mechanism depends on the reaction temperature. Thus, Li 8 SiO 6 may find potential applications as an alternative for CO 2 capture because of its wide temperature range, CO 2 chemisorption capacity and kinetic parameters.

show abstract

“…Sinterable lithium orthosilicate powder can be obtained by reacting and UOH in methanol [26,27]. After wetting the SiO2 with methar.ol, anhydrous LiOH is added.…”

Section: Lithium Orthosilicate Li^sictymentioning

confidence: 99%

Fabrication, properties, and tritium recovery from solid breeder materials

Johnson

Kondo²,

Roux

et al. 1991

Fusion Engineering and Design

Self Cite

View full text Add to dashboard Cite

The breeding blanket is a key component of the fusion reactor because it directly involves tritium breeding and energy extraction, both of which are critical to development of fusion power. The lithium ceramics continue to show promise as candidate breeder materials. This promise was recognized by the International Thermonuclear Experimental Reactor (ITER) design team in its selection of ceramics as the first option for the ITER breeder material. Blanket design studies have indicated properties in the candidate materials data base that need further investigation. Current studies are focusing on tritium release behavior at high burnup, changes in thermophysical properties with burnup, compatibility between the ceramic breeder and beryllium multiplier, and phase changes with burnup. Laboratory and in-reactor tests, some as part of an international collaboration for development of ceramic breeder materials, are underway. Current experimental research is addressing issues identified in ITER blanket design studies, for example, compatibility of the breeder with the beryllium multiplier, tritium release behavior at high burnup, effects of breeder burnup on th£rmophysical properties, and operation at lower temperatures (i.e., <623 K). At present, the design studies place a great emphasis on neutron irradiation effects, and the experimental effort reflects interest in multiple effects. However, complementary separate-effects laboratory experiments are still required to ensure correct interpretation of a material's irradiation behavior. This paper will focus on recent research concerning candidate materials properties, fabrication methodology, irradiation behavior, and tritium transport, as well as computer modeling of tritium transport and release. 2. Materials Preparation and Fabrication In this section the varied processes used to prepare the candidate ceramic breeder material are identified. The powder preparation, fabrication of shapes, and industrial scale production will be discussed. 2.1 Materials Preparation Preparation methods for the ceramic breeders fall into one of three classes, namely: a) solid state reactions, b) solution processes (aqueous or alcohol), and c}-so1-gel methods. Each method, when done properly, yields high purity materials. 2.1.1 Lithium aluminate HAIO2 The standard technique for the synthesis of UAIO2 is the solid state reaction: Li 2 C0 3 + AI2O3 = 2LiAl0 2 + C0 2 (1) This reaction, introduced by Hummel[6], is widely used at a temperature of about 700°C[7-9]. The time allowed for reaction ts between 3 hours[8] and 'This reaction can be performed at temperatures between 550° and 900°C[17,18]. Instead of the carbonate, it is possible to use Li"20[19] or

show abstract

On the preparation of the lithium siclicates series from Li2SiO3 to Li8SiO6 in alcoholic media

Cited by 21 publications

References 3 publications

D-depth profiling in as-implanted and annealed Li-based breeder blanket ceramics

D-depth profiling in as-implanted and annealed Li-based breeder blanket ceramics

Analysis of the CO2 chemisorption reaction mechanism in lithium oxosilicate (Li8SiO6): a new option for high-temperature CO2 capture

Fabrication, properties, and tritium recovery from solid breeder materials

Contact Info

Product

Resources

About