LOW-TEMPERATURE THERMODYNAMIC PROPERTIES OF SINGLE-CRYSTAL Na6Mo11O36
Bespyatov M.A., Shevelev D.S., Trifonov V.A.,
Nazarova A.A., Kuzin T.M., Gelfond N.V.
Nikolaev Institute of Inorganic Chemistry SB RAS
630090, Novosibirsk, Acad. Lavrentiev Ave., 3
Single-crystal Na6Mo11O36 is a promising material for cryogenic scintillating bolometers used in the search for neutrinoless double beta decay. Data on heat capacity are essential to determine the energy resolution of a cryogenic bolometer.
Na6Mo11O36 single crystal was grown from the melt by the low-gradient Czochralski method [1]. The obtained single crystal was thoroughly characterized; its phase and elemental compositions were determined. The total impurity content is 0.015 wt%.
Heat capacity data for the Na6Mo11O36 single-crystal sample were obtained in the range of 5.9 K to 330 K using a BKT-20 adiabatic calorimeter. The description of the experimental setup and the results of test heat capacity measurements for benzoic acid and copper were reported previously [2]. The measurement results are shown in the Figure. This data was obtained for the first time.
Experimental heat capacity of the Na6Mo11O36 single crystal
The heat capacity data were used to calculate the characteristic Debye temperature at 0 K (ΘD(0)= 341 ± 5 K) and the thermodynamic functions in the range of 0–330 K. The results obtained suggest that the Na6Mo11O36 single crystal is a promising candidate for use in cryogenic scintillating bolometer technology.
1. Grigorieva V.D., et. al. // Cryst. Growth Des. 2025, V. 25. P. 986.
2. Bespyatov M.A. // J. Chem. Eng. Data 2025. V. 70. P. 3630.
The study was supported by the grant from the Russian Science Foundation No. 24-19-00405, https://rscf.ru/en/project/ 24-19-00405/