Fabrication of Porous LiAlO2Ceramic Breeder Material

Alvani, C.; Casadio, S.; Lorenzini, Lorenzo; Brambilla, Giovanni

doi:10.13182/fst86-a24751

Cited by 28 publications

(5 citation statements)

References 9 publications

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“…γ-LiAlO 2 has many applications including lattice-match substrate for GaN semiconductor [1] , electrolyte support for molten carbonate full cell (MCFC) [2] , tritium breeding material for fusion reactor [3] and piezoelectric material for surface acoustic wave (SAW) devices [4] . The tritium release property of γ-LiAlO 2 was closely associated with lithium ionic conduction [5][6][7][8] .…”

Section: Introductionmentioning

confidence: 94%

A.C. impedance of γ-LiAlO2 film prepared by laser CVD

2023

AJMC

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110)-oriented γ-LiAlO 2 film consisting of granular grains was prepared by laser CVD. The complex impedance of polycrystalline γ-LiAlO 2 film showed dispersions due to bulk, grain-boundary and electrode. Temperature dependence of the electrical conductivity for γ-LiAlO 2 film, polycrystalline sintered sample and single crystals obeyed Arrhenius behaviour. The electrical conductivity (σT) of the γ-LiAlO 2 film reached 196 S•m -1 •K at 1173 K, nearly 5 times higher than the maximum value of γ-LiAlO 2 single crystals and polycrystalline sintered samples.

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Section: Introductionmentioning

confidence: 94%

A.C. impedance of γ-LiAlO2 film prepared by laser CVD

2023

AJMC

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“…Another method for mass production of lithium aluminate is the sol-gel process. Even though the current experience is not very promising [14,15] f one may be able to develop a mature process. From the broad experience in production of nuclear fission fuel, a variety of shapes (e.g., pellets, discs) should easily be achieved.…”

Section: Industrial Scale Productionmentioning

confidence: 99%

Fabrication, properties, and tritium recovery from solid breeder materials

Johnson

Kondo²,

Roux

et al. 1991

Fusion Engineering and Design

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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

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“…Lithium aluminates have been studied for a variety of functional materials such as color emitting phosphors, solid electrolytes, tritium breeding materials, supports for catalysts and humidity sensors [1][2][3][4][5][6][7][8][9][10]. To date, α-LiAl 5 O 8 , γ-LiAlO 2 and β-Li 5 AlO 4 have been fabricated mainly by sintering processes [2,4,5,8,[11][12][13], while a few studies on the fabrication of Li-Al-O films by using atomic layer deposition (ALD), RF-magnetron sputtering and sol-gel method have been reported [14][15][16]. For improving and developing the functionalities, the microstructures should be controlled, particularly in γ-LiAlO 2 as a diaphragm for molten-carbonate fuel cells (MCFC) and α-LiAl 5 O 8 as a catalytic support [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Microstructure of LiAl5O8 and LiAlO2 Films Prepared by Laser CVD

Chen

Katsui

et al. 2014

KEM

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α-LiAl5O8, γ-LiAlO2, α-Al2O3and those composite films were prepared on AlN polycrystalline substrates by laser chemical vapor deposition (LCVD), and the effects of total pressure (Ptot) and the molar ratio of Li to Al (RLi/Al) on the morphology and deposition rates were investigated. The typical morphology of single-phase γ-LiAlO2films prepared atRLi/Al> 1.0 andPtot> 400 Pa was granular, whereas γ-LiAlO2films prepared atPtot< 200 Pa and γ-LiAlO2-α-LiAl5O8composite films had pyramidal grains. Single-phase α-LiAl5O8films showed polygonally faceted morphologies. Composite films of α-LiAl5O8and α-Al2O3consisted of carifllower-like and faceted grains. A single-phase γ-LiAlO2film deposited at 200 Pa showed the maximum deposition rate of 48 μm h-1.

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Fabrication of Porous LiAlO²Ceramic Breeder Material

Cited by 28 publications

References 9 publications

A.C. impedance of γ-LiAlO2 film prepared by laser CVD

A.C. impedance of γ-LiAlO2 film prepared by laser CVD

Fabrication, properties, and tritium recovery from solid breeder materials

Microstructure of LiAl<sub>5</sub>O<sub>8</sub> and LiAlO<sub>2</sub> Films Prepared by Laser CVD

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