Nowadays, in the rare events physics field, projects to study Neutrinoless Double Beta Decay (0νββ) are actively developing, as 0νββ-decay registration will allow calculating the energy and mass of neutrinos. 0νββ process is theoretically possible in a number of nuclei, one of most promising is 100Mo [1], thus, the compounds with maximal ratio of molybdenum are of interest.
The use of light alkali metals as cations helps to reduce the scintillator's radiation background and increase molybdenum content in the compound. In turn, an increased molybdenum content in the crystal increases the probability of 0νββ-decay registration. In the course of this study, samples of the (Na,Li)6Mo9O30 composition (x = 1-5 with a step of 1.0 were obtained by solid-phase synthesis. Solid-phase synthesis was carried out with a gradual increase in temperature until complete synthesis was determined in all samples. Completeness of the reaction, phase composition and unit cell parameters of the obtained samples were controlled using X-ray diffraction analysis.
Melting temperatures of the samples were determined by Differential Scanning Calorimetry (DSC). During the synthesis, it was found that the fractional composition sample had the lowest synthesis temperature (455 ̊C) of all the studied compositions, which confirms the hypothesis that the compound of this composition belongs to the eutectic point.
Based on the data obtained, stable phases in the binary system Na6Mo9O30-Li6Mo9O30 were identified. Conditions for growing single crystals using the low-thermal-gradient Czochralski technique were proposed.
. Acknowledgements
The study was supported by Russian Science Foundation grant No. 25-73-00328.
. Reference:
1. Agrawal A. et al. Development of MMC-based lithium molybdate cryogenic calorimeters for AMoRE-II// EPJ C. 2025. Vol. 85. № 172. P. 172-185
