Study on Czochralski growth of PbMoO4 single crystal and its defects

The effects of growth parameters such as temperature gradient, pulling rate and rotation rate on quality of PbMoO4 single crystals grown by Czochralski method were studied in this paper. The formation mechanism of macro-defects such as crystal cracks and micro-defects such as dislocation has been investigated. The internal relations between defects and growth parameters were explored from the crystal shape, inclusions and change of dislocation density, and the growth parameters such as temperature gradient were improved. High-quality PbMoO4 single crystals were successfully grown at the temperature gradient of 20-25°C/cm, the rotation rate of 28 r/min and the pulling rate of 1.6 mm/h, whose shapes were perfect and the dimensions were as large as φ40 mm × 70 mm, and the average transmittivity was 72.6% in the range of 0.42-5.5 μm.