Abstract
The fact that the equilibrium liquid and solid phases are generally different during the growth of single crystals of solid solutions from the melt is very important. In other words, solid solutions, with the exception of those with compositions corresponding to acnodes on the fusion surface, incongruently melt and crystallize. As a result, the liquid phase changes during conversion of part of the liquid to the solid. Therefore, the crystal composition during directional crystallization changes along its length. Furthermore, constitutional supercooling and the crystal growth-front instabilities associated with it (for example, formation of cellular structure) can occur. In order to avoid the cellular structure and obtain a homogeneous crystal, the crystallization rate is often slowed so much that directional crystallization becomes practically infeasible. The preparation of crystals of solid solutions with a constant (along the crystal length) composition requires special technical tricks (for example, replenishment of the melt with one of the components) that make it difficult and sometimes impossible to accomplish.
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Fedorov, P.P. (1996). Compositions of Congruently Melting Three-Component Solid Solutions Determined by Finding Acnodes on Ternary-System Fusion Surfaces. In: Givargizov, E.I., Melnikova, A.M. (eds) Growth of Crystals. Poct Kpиctaллob / Rost Kristallov / Growth of Crystals, vol 20. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1141-6_10
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DOI: https://doi.org/10.1007/978-1-4613-1141-6_10
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