抄録
The present study was made in the hope of preparing a large synthetic single crystal of cryolite. As a result of many attempts, the hydrothermal synthesis is proved to be most satisfactory. The cryolite crystal grown is as large as 2.0×1.5×0.8 mm and free from the OH radical.
The characterization of the synthetic cryolite is investigated by the differential scanning calorimeter and the Raman spectrometer.
The specific heat for the synthetic cryolite is expressed as a function of temperature:
Cp=183.9+141.9×10−3T.
The force constants of stretching, deformation and non-bonding for the synthetic single crystal of cryolite are (3.63±0.025)×102, (0.41±0.013)×102 and (0.30±0.00)×102 Nm−1, respectively.
