Monocrystalline fiber growth technique: new critical radius considerations.
RUEDA-P., Jorge-Enrique; RODRIGUES, João Elias Figueiredo Soares; HERNANDES, Antônio Carlos.
RUEDA-P., Jorge-Enrique; RODRIGUES, João Elias Figueiredo Soares; HERNANDES, Antônio Carlos.
Abstract: Laser-heated pedestal growth (LHPG) is an advantageous technique for crystalline fibers pulling due to its fast growth rate, related to the high axial thermal gradient. However, internal cracks can occur if the radius of the fiber is greater than the so-called thermal critical radius. For this reason, it is important to accurately determine the maximum axial thermal gradient to obtain crystalline fibers free of cracks. Herein, we improved the current method for critical radius determination by considering that the maximum temperature gradient is not present in the liquid/solid interface, but occurs directly on fiber, at a certain distance ? from the liquid/fiber interface. In order to evaluate such improvement, cracks-free fibers of SrTiO3 (Melting Point = 2353 K) and Al2O3 (2345 K) were grown with this new criterion.
@article={003035191,author = {RUEDA-P., Jorge-Enrique; RODRIGUES, João Elias Figueiredo Soares; HERNANDES, Antônio Carlos.},title={Monocrystalline fiber growth technique: new critical radius considerations},journal={Journal of Crystal Growth},note={v. 570, p. 126199-1-126199-6},year={2021}}