标题：Incorporation of Cr-containing anionic species into potassium dihydrogen phosphate crystal
作者：Jianxu Ding;Shenglai Wang;Xinguang Xu;Qingtian Gu;Wenjie Liu;Yun Sun;Guangxia Liu;Shengjun Zhu
作者机构：[Ding, J] State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, China;[ Wang, S] State Key Lab 更多
通讯作者地址：[Wang, SL]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
来源：Journal of Crystal Growth
关键词：A1. absorption;A1. crystal morphology;A1. impurities;A2. grown from solutions
摘要：By altering the concentration of chromate (CrO2/4-) additive in the growth solution, a series of potassium dihydrogen phosphate (KDP) crystals was obtained by the conventional temperature cooling method. The addition of CrO2/4- resulted in yellow-green colored KDP crystals. The measurement of the growth rate revealed that CrO2/4- made a small contribution to the growth rate of (100) face. The configurations of CrO2/4- in a saturated KDP solution were confirmed to be Cr_2O2/7- and HCrO4-. Through electrostatic attractive force and charge-assisted hydrogen bonds, Cr_2O2/7~ and HCrO4- were selectively adsorbed onto (101) and (100) faces, respectively. The adsorbed Cr_2O2/7- on the (101) face could be decomposed to CrO2/4- or HCrO4- because of the lower pH value in the growth boundary. CrO2/4- and HCrO4- could enter into crystal lattice because of the structural similarities of CrO2/4--PO3/4-, and consequently made KDP crystals colored and resulted in transmittance adsorptions at 280 and 370 nm in doped KDP crystals. Elemental analysis indicated that the concentration of Cr in KDP crystals increased with increasing CrO2/4- in the growth solution. Additionally, the influence of CrO2/4- on the growth of KDP crystals was similar to that of Cr_2O2/7-.