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We present an experimental study of thin-sample directional solidification(T-DS) in impure biphenyl. The plate-like growth shape of the monoclinicbiphenyl crystals includes two low-mobility (001) facets and four high-mobility{110} facets. Upon T-DS, biphenyl plates oriented with (001) facets parallel tothe sample plane can exhibit either a strong growth-induced plastic deformation(GID), or deformation-free weakly faceted (WF) growth patterns. We determinethe respective conditions of appearance of these phenomena. GID is shown to bea long-range thermal-stress effect, which disappears when the growth front hasa cellular structure. An early triggering of the cellular instability allowedus to avoid GID and study the dynamics of WF patterns as a function of theorientation of the crystal.

Weakly faceted cellular patterns versus growth-induced plastic deformation in thin-sample directional solidification of monoclinic biphenyl