Figure 5.24(a) shows the evolution of concentration gradients on the faces of the growing crystal for a ramp rate of . In the purely buoyancy-driven growth regime, the gradients on the side faces of the crystal progressively keep increasing. Thus, very high concentration gradients are obtained towards the late stages of growth. On comparing with the corresponding variation of concentration gradients with time in Figure 5.23(a), the effect of higher ramp rate of the solution can be clearly understood. The maximum non-dimensional value of concentration gradient for the ramp rate of is around 0.55 observed at t=60 hours. For the lower ramp rate (), the corresponding value is 0.45 after 80 hours. To some extent, rotation lowers the monotonic increase in the concentration gradients in Figure 5.24(a), and improves the left-right symmetry. The difference is on the lower side, where rotation further diminishes concentration gradients, in comparison to growth without rotation. This result is the reverse of what is seen in Figure 5.22(a). The large gradients on the side faces, and low gradients on the horizontal faces leads to high growth rates of the horizontal dimension of the crystal (Figure 5.24(b)), that is relatively insensitive to rotation. The quality of the grown crystals (Figure 5.24(c)) is inferior in transparency to that obtained with a lower ramp rate () that is shown in Figure 5.23(c).