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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (4): 544-549. 上一篇    下一篇

研究论文

K2CaB8O26H24单晶结构和溶解转化机理

贾永忠;高世杨;郁开北;王波;夏树屏;周园   

  1. 中国科学院盐湖研究所西安二部;中国科学院成都分院分析中心
  • 发布日期:2001-04-15

Crystal structur, vibrational spectra and mechanism of dissolution of K2CaB8O26H24

Jia Yongzhong;Gao Shiyang;Yu Kaibei;Wang Bo;Xia Shuping;Zhou Yuan   

  • Published:2001-04-15

PDF

446

被引次数

17

本研究报道K2CaB8O26H24复盐单晶的X射线衍射结构测定结果。结构式为K2Ca[B4O5(OH)4]2·8H2O，属正交晶系(orthorhombic)，空间群P212121，晶胞参数a=1.1550(2)nm,b=1.2484(2)nm,c=1.6580(2)nm。分子体积V=2.3906(6)nm^3,Z=4,Dc=1.792g·cm^-3,μ=0.720mm^-1,F=(000)=1320。使用振动光谱表征了该复盐的基团特征。根据该复盐在水中的溶解过程，讨论了溶解转化机理，得出该复盐为组分不同步溶解，溶解产物属于无定形态，后转化为晶态Ca[B3O3(OH)5]·4H2O.

关键词: 硼氧酸盐, 复盐, 振动光谱, 溶解, 晶体结构, Ｘ射线衍射分析

The single crystla of K2CaB8O26H24 has been determined by X-ray diffraction. Crystal data:orthorhombic, P212121,a=1.1550(2)nm,b=1. 2484(2)nm,c=1.6580(2)nm。 V=2.3906(6)nm^3,Z=4,Dc=1.792g·cm^-3,μ=0. 720mm^-1, F=(000)=1320. Its vibrational spectra are recorded. The observed frequencies and their assignments are given. The dissolution of K2CaB8O26H24 was incongruous and its production is X-ray amorphis. This amorphism would transform to crystal. The mechanism of dissolution was suggested.

Key words: DOUBLE SALTS, VIBRATIONAL SPECTRUM, DISSOLUTION, CRYSTAL STRUCTURE, X-RAY DIFFRACTION ANALYSIS

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