Direct measurements of crystallization heat of NaNO₃ and CdTe melts activated by low-frequency vibrations by oscillating an inert baffle submerged into the melt demonstrated up to 30% increase compared to the regular melt. At a stationary state the crystallization heat increase depends on vibrational amplitude and frequency. The study of melt structure by Raman spectroscopy proved the assumption about the changing of component composition followed by its restructure under AVC processing. Kinetics of melt reconstruction depending on temperature and vibrational intensity was examined.

The problem of intensification of the melt crystal growth process has been analyzed using CdTe as an actual material. Numerical simulation of 100 mm diameter CdTe crystal growth using the VGF technique has been carried out. The heat–mass transfer was controlled by introducing low-frequency oscillating baffle into the melt, which is a so-called axial vibrational control (AVC) technique. The baffle configuration has been optimized to destroy solid “tails”, which were formed near the crucible walls at high cooling rates due to the low thermoconductivity and the corresponding latent heat. Analysis of CdTe homogeneity range showed that during fast crystal cooling, Te micro precipitations were formed, resulting from the decay of oversaturated Cd-rich nonstoichiometric solid solution during the Bridgman crystal growth technique. After full crystallization, a VGF-grown CdTe crystal stays inside the phase field of the high-temperature wurtzite polymorph. This makes it possible to go through the polymorph transition without Te micro-precipitating using the advantages of the VGF-specific feature of very slow cooling.