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同步辐射及其在无机材料中的应用进展
刘云鹏1(), 盛伟繁1,2, 吴忠华1,2()
Synchrotron Radiation and Its Applications Progress in Inorganic Materials
LIU Yunpeng1(), SHENG Weifan1,2, WU Zhonghua1,2()

图4. CaCO3·1/2H2O的高分辨同步辐射X射线衍射图谱及其晶体结构模型[9]

Fig. 4. High-resolution SR-XRD pattern of CaCO3·1/2H2O and its crystal structure model[9]
(a) Synchrotron HRXRPD pattern of CaCO3·1/2H2O using a wavelength of 0.049596 nm; (b) The layers of CaCO3·1/2H2O consist of Ca(μ2-CO3)2/5(μ1-CO3)3/5(H2O)1/2 double zigzag chains running along the a axis, here, differently oriented (up and down) carbonate groups are indicated by indices μ2 and μ1; (c) Stacking in the c direction occurs in a conventional ABAB fashion with an interlayer spacing (the distance between Ca planes) equal to 0.308 nm. The insets in (a) show comparisons of the measured HRXRPD pattern of CaCO3·1/2H2O with simulated patterns of other calcium carbonate phases. Different types of atoms are colored as follows: Ca, blue; carbonate group, green; oxygen from water, red; and hydrogen, gray