Growth of lithium triborate crystals.

摘要

Lithium triborate (;The pseudo phase diagram of the ;Calculations were carried out using a mathematical model for heat and fluid flow in the melt to establish the temperature distribution, fluid flow velocity and flow direction in the melt as a function of crystal and crucible rotation. Temperature measurements were then made in the melt in a crystal grower with a simulated crystal over a range of crucible rotation rotation rates, and the results compared to the mathematical model predictions. The boundary conditions used in the model were determined from temperature measurements in the melt.;The flow patterns in the melt predicted by the model were also compared to the observed flow in a physical, model using glycerine as the melt and ink as a tracer, for the same size crucible and crystal used in crystal growth. The observed flow pattern was consistent with the model predictions. The results of both the mathematical and physical models clearly showed that most of the mixing in the liquid is associated with the crucible rotation and very little from buoyancy forces. From these results it was concluded that maximium crucible rotation should be used during growth to move the concentrated MoO;A series of crystals of LBO were grown in a commercial crystal grower selecting the MoO