Synergy of organic dyes for KDP crystal growth by Kouji Maeda, Akira Sonoda, Hideo Miki, Yusuke Asakuma, and Keisuke Fukui

Crystal Research and Technology

Cryst. Res. Technol. 39, 1006 (2004) - Abstract -

Synergy of organic dyes for KDP crystal growth

Kouji Maeda, Akira Sonoda, Hideo Miki*, Yusuke Asakuma, and Keisuke Fukui

Department of Mechanical System Engineering, University of Hyogo, 2167 Shosha, Himeji 671-2201, Hyogo, Japan
*Crystal Engineering Corporation, Osaka, Japan

Keywords	dye, KDP, impurity segregation, morphology, growth rate
PACS	81.10.-h, 61.72.Ss, 81.10.Aj
DOI	10.1002/crat.200410285

Single potassium dihydrogen phosphate (KDP) crystals were grown in a supersaturated solution containing an organic dye (sunset yellow FCF, brilliant blue FCF, and sky blue). The growth rate, morphology, and impurity dye distribution of faces, (100) and (101) in a KDP crystal were measured as dye concentration and the supersatutation of KDP were changed. Complete expressions for the effect of dye on all aspects of the growth of KDP crystals were discussed. The growth rates of (100) and (101) faces were well correlated by the empirical equation, and resulted in good estimation of the morphology. The distribution of dye in a KDP crystal was represented by the distribution model containing the minimum growth rate for coloring. The growth rate equation and distribution equation were expressed by functions of the supersaturation and dye concentration, and they could effectively provide the operational conditions with coloring the KDP crystal.

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