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Assessment of Cs 2 HfCl 6 crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics

Dumoulin, L. ; Giuliani, A. ; Kandel, R. ; Khalife, H. ; Kuznetsov, S. V. ; Nagorny, S. S. ; Nahorna, V. V. ; Nishchev, K. N. ; Nones, C. ; Olivieri, E. ; Poda, D. V. ; Popov, P. A. ; Pynenkov, A. A. ; Stenning, G. ; Wang, P. ; Zolotarova, A. S.

Journal of materials chemistry. C, Materials for optical and electronic devices, 2022-03, Vol.10 (13), p.5218-5229 [Peer Reviewed Journal]

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Title:
Assessment of Cs 2 HfCl 6 crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics
Author: Dumoulin, L. ; Giuliani, A. ; Kandel, R. ; Khalife, H. ; Kuznetsov, S. V. ; Nagorny, S. S. ; Nahorna, V. V. ; Nishchev, K. N. ; Nones, C. ; Olivieri, E. ; Poda, D. V. ; Popov, P. A. ; Pynenkov, A. A. ; Stenning, G. ; Wang, P. ; Zolotarova, A. S.
Is Part Of: Journal of materials chemistry. C, Materials for optical and electronic devices, 2022-03, Vol.10 (13), p.5218-5229
Description: The first study of some thermodynamic properties of a Cs 2 HfCl 6 (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.
Language: English

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Assessment of Cs 2 HfCl 6 crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics

Dumoulin, L. ; Giuliani, A. ; Kandel, R. ; Khalife, H. ; Kuznetsov, S. V. ; Nagorny, S. S. ; Nahorna, V. V. ; Nishchev, K. N. ; Nones, C. ; Olivieri, E. ; Poda, D. V. ; Popov, P. A. ; Pynenkov, A. A. ; Stenning, G. ; Wang, P. ; Zolotarova, A. S.

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