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Thermal Field Simulation and Optimization of PbF2 Single Crystal Growth by the Bridgman Method

Authors :
Lin Li
Peixiong Zhang
Zhen Li
Zhenqiang Chen
Source :
Crystals, Vol 14, Iss 5, p 473 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

PbF2 single crystals are usually grown in the temperature gradient region by the Bridgman–Stockbarger method. Temperature distribution during the growth process is particularly important for the preparation of high-quality crystals. In this study, the temperature field during the growth of the PbF2 single crystals was simulated based on the finite element method. The temperature distribution and temperature gradient changes in the crucible were investigated at different growth stages, including the seeding, shouldering, and iso-diameters stages. The calculated results show that as the crucible position continues downward during the growth process, the axial temperature gradient increases and then decreases from the bottom to the top of the crucible, with almost flat isotherms near the solid–liquid interface where the axial temperature gradient is larger. At the shoulder below the crucible, the solid–liquid interface was improved by adjusting the tilt angle. Furthermore, based on a novel design of the heat-insulating baffle, the concave solid–liquid interface in the iso-diameter stage can be effectively adjusted to realize a lower radial temperature gradient. This study provides theoretical guidance for the optimization of the growth of high-quality PbF2 crystals by the Bridgman method.

Details

Language :
English
ISSN :
20734352
Volume :
14
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Crystals
Publication Type :
Academic Journal
Accession number :
edsdoj.926a87bf7fd8490cade4fa4e3dbc3bc2
Document Type :
article
Full Text :
https://doi.org/10.3390/cryst14050473