Monocrystalline fiber growth technique: New critical radius considerations

Autor(es)

Rueda-P, Jorge-Enrique ^[1] ; Rodrigues, J. E. F. S. ^{[2, 3]} ; Hernandes, Antonio Carlos ^[2]

Afiliação do(s) autor(es)

^[1] Univ Pamplona, Dept Fis, Pamplona 543050 - Colombia

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13566970 Sao Paulo, SP - Brazil

^[3] ESRF, European Synchrotron Radiat Facil, 71 Ave Martyrs, F-38000 Grenoble - France

• Tipo de documento: Artigo Científico
• Fonte: Journal of Crystal Growth; v. 570, SEP 15 2021.
• Citações Web of Science: 0

Resumo

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 Delta 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. (AU)

• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs