Abstract
Hexagonal tubular YAl3(BO3)4 crystals of millimeter diameter were obtained by spontaneous crystallization from B2O3–SrO flux system. The sizes of these tubular crystals range from 0.5 mm to 6 mm in diameter, 0.2–0.4 mm in wall thickness, and 1–10 mm in length, which are obviously influenced by the cooling rate. A formation mechanism of tubular YAl3(BO3)4 crystals was proposed, which inferred that lateral variation of solute supersaturation along (001) crystal face due to the fast growth speed along the [001] direction and the high viscosity of the solution led to the formation of tubular structures.
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