Conventional Czochralski growth of large Li2MoO4 single crystals

Ahmine, A.; Velázquez, M.; Nagirnyi, V.; Romet, Ivo; Duffar, T.

doi:10.1016/j.jcrysgro.2021.126420

Cited by 3 publications

(6 citation statements)

References 25 publications

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Section: Lithium Molybdate (Clymene Project)mentioning

confidence: 99%

“…Another crystal scintillator studied in the present work is Li 2 MoO 4 , which was developed within the R&D program of the CLYMENE project [24,25,[32][33][34]. The optimization of the Cz growth process was guided by COMSOL multiphysics modeling and numerical simulations in conjunction with well-chosen experimental validations [34]. The furnace configuration and the crystal growth parameters were optimized to produce large-volume ingots with a regular shape (5 cm in diameter, about 15 cm in length) and with reduced thermal stresses [25,32,33], in contrast to the first large CLYMENE crystal (0.23 kg) which exhibited a partial cleavage starting from the bottom part of the ingot [24].…”

Section: Lithium Molybdate (Clymene Project)mentioning

confidence: 99%

“…Two parts of this crystal with [24] and without [35] a cleavage were tested as low-temperature scintillating detectors, particularly showing the impact of the crystal crack on the phonon propagation. The first large-mass (0.82 kg) ingot grown in the optimized Cz furnace [34] exhibits regular shape (about 15 cm of the cylindrical part), good structural quality and no mechanical cleavage upon cooling, processing and shaping procedures. We used the bottom part of the ingot to produce a Li 2 MoO 4 sample (⊘48 × 44 mm, 245 g) for this work.…”

Section: Lithium Molybdate (Clymene Project)mentioning

confidence: 99%

“…It is worth noting that initial, i.e. not additionally purified, starting materials were used for the Li 2 MoO 4 crystal production [34], and this test is not intended to prove an ultra-high radiopurity. At the same time, the bulk U/Th and K contamination of the tested crystal is rather low for a sample produced without any particular care on its radiopurity.…”

Section: Comparison Of the Crystal Radiopuritymentioning

confidence: 99%

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Test of ¹¹⁶CdWO₄ and Li₂MoO₄ scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Ahmine,

Bandac,

Barabash

et al. 2023

J. Inst.

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In preparation for the CROSS experiment to search for double-beta (2β) decay of 100Mo, we upgraded a low-background facility at the Canfranc underground laboratory (Spain) by installing a magnetic damping-based detector suspension inside a pulse-tube cryostat. We tested the suspension in low-temperature (15 mK) measurements with two scintillating bolometers made of large-volume crystals of 116CdWO4 (reference of the set-up) and Li2MoO4 (R&D of the CLYMENE project in view of the CUPID 2β experiment), each coupled to a thin Ge bolometric light detector. Despite the evidence of a residual pulse-tube-induced noise, picked up by cabling, we achieved high performance with all tested devices. In particular, the energy resolution for 2615 keV γ-ray measured with both 116CdWO4 and Li2MoO4 bolometers is ∼6 keV FWHM, among the best-reported results for thermal detectors based on such compounds representing a great interest to searches for 2β decay in 116Cd (Q-value is 2813 keV) and 100Mo (3034 keV) respectively. Highly efficient particle identification (α vs. β/γ) is achieved also with the scintillating bolometer made of a low light yield crystal (Li2MoO4), thanks to the low noise (10 eV RMS) exhibited by the light detector exploiting the Neganov-Trofimov-Luke effect for signal amplification. We also found a rather high level of radiopurity in the Li2MoO4 crystal; only traces of 210Po and 226Ra were detected (∼0.1 mBq/kg each), while the 228Th activity is expected to be at least an order of magnitude lower, as well as a 40K activity is below 6 mBq/kg.

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Section: Lithium Molybdate (Clymene Project)mentioning

confidence: 99%

Section: Lithium Molybdate (Clymene Project)mentioning

confidence: 99%

Section: Lithium Molybdate (Clymene Project)mentioning

confidence: 99%

Section: Comparison Of the Crystal Radiopuritymentioning

confidence: 99%

See 2 more Smart Citations

Test of ¹¹⁶CdWO₄ and Li₂MoO₄ scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Ahmine,

Bandac,

Barabash

et al. 2023

J. Inst.

Self Cite

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“…[11,12] The first single LMO crystals have been grown using the Czochralski method in order to measure their physical properties. From small crystals of about 34 g [13] to heavier crystals of more than 700 g [14] and recently 1 kg, [15] LMO single crystals have been grown by a conventional Czochralski process, and one of them is used to build a bolometer. Dislocation densities in these crystals are on the order of magnitude of 10 4 cm −2 for the best crystals, and the scintillation properties are similar to those previously reported for closely related crystals.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of Radiative Heat Transfer in Czochralski Furnace and 3D Anisotropic Thermal Stress in Li₂MoO₄ Bulk Crystal

Haddad

Bouzouaoui

Mokhtari

et al. 2022

Cryst. Res. Technol.

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Here, the radiative heat transfer inside a Czochralski furnace and the 3D thermal stress generated in a semitransparent Li2MoO4 crystal are deeply analyzed using anisotropic and temperature‐dependent elasticity and thermal expansion coefficients. The developed global numerical model takes into account induction heating, thermal conduction in all parts of the furnace, convection in the melt and the growth atmosphere, Marangoni convection at the free surface, radiation heat exchange between the furnace elements, internal radiation inside the semitransparent crystal and melt, and phase change at the growth interface. The contribution of each radiation mode is studied separately, then coupled together to clearly explain their roles in heat transfer, stress generation in the as‐grown crystal and in power consumption, and heat loss inside the furnace. Flow and temperature fields in the molten oxide and in the growth atmosphere as well as the thermal stress are presented and discussed for each case. Unrealistic cases are first considered where radiation exchange between the furnace elements and internal radiation in the assumed opaque crystal are neglected. For each case, the relation between temperature gradient and thermal stress is clearly demonstrated. Finally, the effect of the melt opacity on thermal stress is studied and related to temperature gradients in the crystal and at the free surface. The experimental observations are in good agreement.

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Mechanical properties of Li2MoO4 single crystals

Ahmine

Djémia

Fivel

et al. 2022

Journal of Applied Physics

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Mechanical properties of lithium molybdate single crystals, Li2MoO4, are studied from room temperature to 650 °C. Density functional theory calculations gave the seven elastic constants of the rhombohedral crystal at 0 K. Brillouin light scattering experiments delivered comparable values at room temperature, and measurements up to 650 °C show a linear decrease in the constants with temperature. Nano-indentation results were typical of a brittle material with a low Young modulus and allowed deriving Young's moduli, for c (63 GPa) and m (48 GPa) faces, in agreement with those computed from measured elastic constants. Compressive rupture tests were performed. At 650 °C, the rupture stress was in the range 2–7.5 MPa. No clear evidence of a plastic regime was observed before cracking, even at temperatures close to the melting point.

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Conventional Czochralski growth of large Li2MoO4 single crystals

Cited by 3 publications

References 25 publications

Test of ¹¹⁶CdWO₄ and Li₂MoO₄ scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Test of ¹¹⁶CdWO₄ and Li₂MoO₄ scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Computational Analysis of Radiative Heat Transfer in Czochralski Furnace and 3D Anisotropic Thermal Stress in Li₂MoO₄ Bulk Crystal

Mechanical properties of Li2MoO4 single crystals

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Conventional Czochralski growth of large Li2MoO4 single crystals

Cited by 3 publications

References 25 publications

Test of 116CdWO4 and Li2MoO4 scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Test of 116CdWO4 and Li2MoO4 scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Computational Analysis of Radiative Heat Transfer in Czochralski Furnace and 3D Anisotropic Thermal Stress in Li2MoO4 Bulk Crystal

Mechanical properties of Li2MoO4 single crystals

Contact Info

Product

Resources

About

Test of ¹¹⁶CdWO₄ and Li₂MoO₄ scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Test of ¹¹⁶CdWO₄ and Li₂MoO₄ scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Computational Analysis of Radiative Heat Transfer in Czochralski Furnace and 3D Anisotropic Thermal Stress in Li₂MoO₄ Bulk Crystal