重水素リン酸カリウム(KD_2PO_4)の合成とその単結晶の育成(III)

概要

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It is known that a crystal of potassium deuterium phosphate (KD_2PO_4) is better than a potassium hydrogen phosphate crystal (KH_2PO_4) for the uses of modulator of Laser or high speed shutter by means of its electro-optic effect. However, up to date, there is not any informations that the growing method of KD_2PO_4 single crystal has been succeeded such as a sufficient large dimension to make profit of it. Now, as we studied the new methods of synthesis of KD_2PO_4 with high purity (99.8%) D_2O, and then growth of that single crystals, we show the summary results of these items. In the first place, as for the method of synthesis, we give a thought to the dry box method is better than the former distillation type with respect to a high purification of composition. Next, as to the growth of single crystals, we adopt a temperature decreasing method of the growing bath in N_2 gas atmosphere and select the orientation of the seed crystal axis in accordance with the purpose of uses, therefore, c-axis sets horizontally or vertically owing to each purpose of uses for the modulator of Laser or the high speed shutter of camera respectively. For example, we have made the single crystal with the weight of 23.0 gram and the demensions of 16.5×18.0×38.1mm. Further, as the result of X-ray analysis, it made clear that these crystals belong to a tetragonal, and a lattice constant is a=b=7.448A, c=6.983A and an axial angle is α=β=γ=90°.
山梨大学の論文