Physicochemical processes in blanket ceramic materials

Physicochemical processes in blanket ceramic materials

Effect of external magnetic field (MF) on important physicochemical processes in ceramic blanket materials, the Li 4SiO 4 (FZK) and Li 2TiO 3 (CEA) ceramic pebbles, was studied. Stoichiometric amounts of the radiation-induced defects (RD) of the electron and hole type form at radiolysis of the ceram...

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Bibliographic Details
Published in:Fusion engineering and design Vol. 69; no. 1; pp. 519 - 522
Main Authors: Tı̄liks, J., Ķizāne, G., Vitiņš, A., Vı̄tiņš, Ģ., Meistars, J.
Format: Journal Article Conference Proceeding
Language:English
Published: Amsterdam Elsevier B.V 01-09-2003
New York, NY Elsevier Science
Subjects:
Applied sciences
Blanket
Ceramic pebbles
Controled nuclear fusion plants
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fusion reactor
Installations for energy generation and conversion: thermal and electrical energy
Magnetic field
Radiolysis
Radiolysis
Blanket
Fusion reactor
Ceramic pebbles
Magnetic field
Nuclear fusion reactor
Electrical conductivity
Lithium
Tritium
Diffusion
Ceramic materials
Colloid
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Summary:Effect of external magnetic field (MF) on important physicochemical processes in ceramic blanket materials, the Li 4SiO 4 (FZK) and Li 2TiO 3 (CEA) ceramic pebbles, was studied. Stoichiometric amounts of the radiation-induced defects (RD) of the electron and hole type form at radiolysis of the ceramic materials. Colloid lithium forms only in Li 4SiO 4 under irradiation at the temperature 423–473 K and the dose 10–20 MGy. The magnetic field increases the radiolysis efficiency by 20–25% in both materials. The efficiency of formation of RD decreases with the increasing temperature of irradiation. Complete recombination of RD takes place at 873 K. The magnetic field retards the tritium release by lengthening the path of volume diffusion of charged tritium forms (T +). The substitution of 10 at.% of Ti 4+ by Nb 5+ produces additional cation vacancies in Li 2TiO 3 and increases the electrical conductivity by approximately 10 times at 1000 K. The constant of tritium diffusion is anticipated to be proportional to the electrical conductivity. The decrease of lithium content in Li 2TiO 3 ceramics simulating the lithium burn-up increases the electrical conductivity of ceramics.
ISSN:0920-3796
1873-7196
DOI:10.1016/S0920-3796(03)00120-0