Journal
JOURNAL OF CRYSTAL GROWTH
Volume 531, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jcrysgro.2019.125385
Keywords
Computer simulation; Czochralski method; Lithium compounds; Oxides; Scintillator materials
Funding
- ANR, via the CLYMENE grant [ANR-16-CE08-0018-01]
- Agence Nationale de la Recherche (ANR) [ANR-16-CE08-0018] Funding Source: Agence Nationale de la Recherche (ANR)
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A new technology for the mass production of lithium molybdate (Li2MoO4) crystals needed for the realization of the cryogenic neutrinoless double-beta decay detectors is under development within the framework of the CLYMENE project. Crystals with 4 and 5 cm in diameter were grown in two different Czochralski configurations. The first configuration, based on inductive heating of a RF coil coupled with a platinum crucible, was used to grow crystals of 4 cm in diameter. Bolometric tests performed with two samples cut from a 230 g crystal have shown less performances of the large sample (158 g), which had a cleavage, as compared to the small non-cracked sample (13.5 g). Numerical modeling was applied to investigate the temperature field in the furnace, the melt convection and thermo-elastic stresses in the crystal. Numerical results reveal 30% higher thermal stress at the bottom part of the ingot in the case of a concave shape of the crystal tail (experimental case) as compared to the case of a convex shaped tail. This could explain why the fracture started at the bottom part of the 230 g crystal boule, and highlights the importance of the crystal shape in the last stage of growth process. The furnace configuration used to grow 5 cm-diameter crystals was numerically optimized in order to reduce the thermal stress in the crystals. The first kg-mass Li2MoO4 ingot grown in the optimized configuration exhibit regular shape and good structural quality.
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