Mathematical modeling and experimental investigation of the effect of temperature gradients on crystallization processes under terrestrial and space conditions

Application of X-ray topography to USSR and Russian space materials science

“…As a result of the conducted experiments, it was theoretically proven and, for the case of Ge(Ga) and GaSb(Te) crystals, experimentally implemented, that an approximation to conditions of pure diffusion mass transfer in a melt under terrestrial conditions allowed a considerable raising of the levels of macro-and microhomogeneity in the grown crystals (Serebryakov et al, 2007;Strelov et al, 2005).…”

Understanding the role of gravity in the crystallization suppression of ZBLAN glass

“…........................................................... Figure 2.1: Isolines of the absolute velocity of convective flows at different values of gravity and ratios ΔT z /ΔZ (ΔT r = 2K/cm) [Strelov, 2005] The influence of temperature on the mobility (diffusion) and the nucleation barrier (left); How time and temperature affect the nucleation process (right) [Schaffer, 1999]. ................................................................................................................................ [Vlack, 1989].…”

“…Conditions" by V.I. Strelov et al [2005] suggest that the processes of heat and mass transfer occurring in a melt during its crystallization is one of the deciding factors for the homogeneity of properties of the crystal growth. Depending on the structure and intensity of these processes, the crystal growth is determined by diffusive, convective, or both of these HMT processes [Strelov, 2005].…”

“…Strelov et al [2005] suggest that the processes of heat and mass transfer occurring in a melt during its crystallization is one of the deciding factors for the homogeneity of properties of the crystal growth. Depending on the structure and intensity of these processes, the crystal growth is determined by diffusive, convective, or both of these HMT processes [Strelov, 2005]. The authors feel that the main decisive factor for this occurrence is the radial temperature gradient ΔT r in a melt and under the conditions of microgravity the Marangoni convection is the deciding factor.…”

“…The authors feel that by optimizing these processes it will be possible to grow single crystals with highly uniform properties under both terrestrial and space conditions. The purpose of their study is to investigate the processes of formation of microinhomegeneities during the growth of Ge [Strelov, 2005].…”