Research of Structural Quality of Big-Size KDP Crystals

摘要

The faulted structure formation at a rapid growing of big-size KDP crystals hasudbeen analyzed. A transitional zone with high degree of lattice faultness has been revealedudbetween the seed and the pure zone of the grown crystal by X-ray diffraction methods withudhigh resolution. It has been determined that, regardless of the seed form, the transitional layerudin grown crystals reaches the value of~12 mm. The nonmonotone variation of the crystaludlattice parameter (∆d/d) within ±2.5·10⁻⁵ and the halfwidth of a diffraction reflection curveud(β = 5.5÷8 arcs for direction [103] and β = 7÷9 arcs for direction [100]) and the increase ofudthe integral power of reflection of the X-ray beam IRud by 1.5 times are observed in theudtransitional lay