Assessment of Cs<sub>2</sub>HfCl<sub>6</sub> crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue J.Mater.Chem. C Année : 2022

Assessment of Cs2HfCl6 crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics

Résumé

The first study of some thermodynamic properties of a Cs2HfCl6 (CHC) scintillating crystal has been performed in a wide temperature range of 5–300 K. The CHC crystal exhibits a high thermal expansion coefficient (5.17 × 10−5 at 171 K), along with an extremely low heat conductivity (1.710 W m−1 K−1 at 50 K). A high heat capacity (1.22 J kg−1 K−1 at 3.8 K) along with a drastically low free mean path for phonons (about 26 Å) at temperatures around 50 K makes the CHC crystal unsuitable as a target material for cryogenic detectors. The results of the first operation of the CHC crystal as a cryogenic detector at sub-Kelvin temperatures clearly show the unfavorable phonon propagation properties of the material. On the other hand, the CHC crystal demonstrates excellent scintillating characteristics with a relatively high light yield under gamma irradiation (the detected signal is about 5200 photons per MeV). The refractive index within the (1.66–1.67) interval for light in visible and near-infrared spectral ranges was measured at room temperature. A cost- and time-effective approach for new crystalline material characterization as a target for cryogenic detectors based on the evaluation of the thermodynamic properties of the material is proposed.
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Dates et versions

hal-03619785 , version 1 (25-03-2022)

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L. Dumoulin, A. Giuliani, R. Kandel, H. Khalife, S.V. Kuznetsov, et al.. Assessment of Cs2HfCl6 crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics. J.Mater.Chem. C, 2022, 10 (13), pp.5218. ⟨10.1039/d1tc06166f⟩. ⟨hal-03619785⟩
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