Improved radial segregation via the destabilizing vertical Bridgman configuration

Application of a rotating heat field in Bridgman–Stockbarger crystal growth

“…On the one hand, there is a stabilizing gradient close to the so-called overcooled ampoule wall (profile 1) as an effect of temperature increasing upward in the melt. On the other hand, there is a destabilizing gradient close to the overheated wall (profile 2) which was shown to provide improved radial segregation as compared to the stabilizing configuration [6]. Here, the destabilizing gradient is of the same origin as that created by a short heating booster near the growth interface as described in Ref.…”

Development of model-based control for Bridgman crystal growth

“…The second system is the destabilizing (KWG) configuration in which an inherently time-periodic flow is obtained above a critical melt height [8,9]. The objective for both of these systems is to damp the time-dependent nature of the flows.…”

“…For brevity, the details of this model are not presented here, rather the interested reader is referred to the descriptions in Refs. [8,9,12]. The finite element mesh, shown in Fig.…”

“…These experiments were among the first to conclusively link solute segregation phenomena, especially the occurrence of striations, with dynamic flow states in the melt. We previously have employed these models to study time-periodic and multiple flow states in these systems [8,9].…”

Developing Quantitative, Multiscale Models for Microgravity Crystal Growth

“…We are also able to employ computer‐aided bifurcation theory employing the Newton–Raphson method to solve for a quasi‐steady‐state model based on the short‐time‐scale dynamics of the system (see Refs. 57 and 58 for more details).…”