在横向磁场中用Bridgman法生长HgCdTe晶体

在横向磁场中用Ｂｒｉｄｇｍａｎ法生长的晶锭其轴向组分分布在中部和尾部具有相同的趋势，在头部有三种类型的分布。磁场通过对固液混合区对流的作用影响溶质的再分布和轴向组分分布。突然施加磁场和中断磁场都引起轴向组分分布的突变。当安瓿绕生长轴匀速旋转时，晶锭的径向组分分布既没有安瓿不旋转时的偏心特征，也没有常规Ｂｒｉｄｇｍａｎ法生长晶体的径向对称性，尾部呈现圆锥状的凸起，可能是旋转生长抑制胞状结构的证据。

GROWTH OF HgCdTe CRYSTAL IN MAGNETIC FIELD BY Bridgman METHOD

HgCdTe crystals were grown by Bridgman method in a transverse magnetic field. The composition of the center and tail of the crystal changed continually from the high value to the low value in the axial direction, and the composition distribution had the same trend in the difFerent magnetic field, the distribution in the head of the crystal had three characterization. There was a redistribution process of the solute in the initial growth stage. The application of magnetic field influenced the redistribution of solute and the composition distribution along its axial by the convention in the solid- liquid interface. The compositional distribution in the axial direction decreased suddenly when the magnetic field was suddenly applied or removed. The compositional distribution along the axial did not change when the ampoule rotated with uniform velocity around its central axis, also which had neither the radial distribution's symmetry in standard Bridgman method, nor the deviation characterization from the central part in magnetic field, compositional distribution was uniform. The cone protrusion at the tail may provide the proof of rotation growth suppressing the cellular structural growth.