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 0.5mm to 6mm in diameter, 0.2–0.4mm in wall thickness, and 1–10mm 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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