Modeling Czochralski growth of oxide crystals for piezoelectric and optical applications

8th International Scientific Colloquium on Modelling for Materials Processing

Stelian, C.^1 ; Duffar, T.^1

Université Grenoble Alpes, CNRS, Grenoble INP, SIMAP, Grenoble

F-38000, France^1

关键词: Crucible rotation;    Crystal-melt interface;    Interface shape;    Numerical results;    Optical applications;    Radiative heat exchange;    Sapphire crystal;    Semi-transparent;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/355/1/012002/pdf
DOI  :  10.1088/1757-899X/355/1/012002

来源: IOP

【 摘 要 】

Numerical modeling is applied to investigate the impact of crystal and crucible rotation on the flow pattern and crystal-melt interface shape in Czochralski growth of oxide semi-transparent crystals used for piezoelectric and optical applications. Two cases are simulated in the present work: the growth of piezoelectric langatate (LGT) crystals of 3 cm in diameter in an inductive furnace, and the growth of sapphire crystals of 10 cm in diameter in a resistive configuration. The numerical results indicate that the interface shape depends essentially on the internal radiative heat exchanges in the semi-transparent crystals. Computations performed by applying crystal/crucible rotation show that the interface can be flattened during LGT growth, while flat-interface growth of large diameter sapphire crystals may not be possible.