Experimental and numerical investigations of the Czochralski growth of Li2MoO4 crystals for heat- scintillation cryogenic bolometers

Autor: E. Olivieri, Matias Velázquez, P. de Marcillac, A. Ahmine, A. S. Zolotarova, T. Duffar, D.V. Poda, C. Nones, H. Cabane, S. Marnieros, A. Giuliani, Th. Redon, V. Novati, Philippe Veber, Carmen Stelian
Přispěvatelé: Science et Ingénierie des Matériaux et Procédés (SIMaP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Luminescence (LUMINESCENCE), Institut Lumière Matière [Villeurbanne] (ILM), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CristalInnov, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), ANR-16-CE08-0018,CLYMENE,Croissance Czochralski de cristaux massifs Li2MoO4 pour les bolomètres scintillants utilisés en détection des évènements rares(2016)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Journal of Crystal Growth
Journal of Crystal Growth, Elsevier, 2020, 531, pp.125385. ⟨10.1016/j.jcrysgro.2019.125385⟩
Journal of Crystal Growth, 2020, 531, pp.125385. ⟨10.1016/j.jcrysgro.2019.125385⟩
ISSN: 0022-0248
DOI: 10.1016/j.jcrysgro.2019.125385⟩
Popis: International audience; 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 2 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.
Databáze: OpenAIRE
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