Images and graphs from a Raman and infrared spectroscopic study of the vivianite-group phosphates vivianite, baricite and bobierrite

The molecular structure of the three vivianite-structure, compositionally related phosphate minerals vivianite, baricite and bobierrite of formula M32+(PO4)2.8H2O where M is Fe or Mg, has been assessed using a combination of Raman and infrared (IR) spectroscopy.

Figure 1 is Raman spectra of the hydroxyl-stretching region of (a) vivianite, (b) baricite and (c) bobierrite.

Figure 2 is IR spectra of the hydroxyl-stretching region of (a) vivianite, (b) baricite and (c) bobierrite.

Figure 3 is IR spectra of the water HOH-bending region of (a) vivianite, (b) baricite and (c) bobierrite.

Figure 4 is Raman spectra of the phosphate-stretching region of (a) vivianite, (b) baricite and (c) bobierrite.

Figure 5 is IR spectra of the PO4-stretching region of (a) vivianite, (b) baricite and (c) bobierrite

Figure 6 is Raman spectra of the low-wavenumber region of (a) vivianite, (b) baricite and (c) bobierrite.

对化学式为M32+(PO4)2.8H2O，其中M代表铁或镁的 Vivianite、Baricite 和 Bobierrite 三种磷酸盐矿物，其分子结构及其组成进行了评估，评估方法为拉曼光谱与红外光谱的结合应用。图1展示了 Vivianite、Baricite 和 Bobierrite 的羟基伸缩振动区域的拉曼光谱，分别对应于 (a) Vivianite、(b) Baricite 和 (c) Bobierrite。图2呈现了上述矿物的羟基伸缩振动区域的红外光谱。图3展示了 Vivianite、Baricite 和 Bobierrite 的水分子 HOH 弯曲振动区域的红外光谱。图4展示了 Vivianite、Baricite 和 Bobierrite 的磷酸盐伸缩振动区域的拉曼光谱。图5展示了 Vivianite、Baricite 和 Bobierrite 的 PO4 伸缩振动区域的红外光谱。图6展示了 Vivianite、Baricite 和 Bobierrite 的低波数区域的拉曼光谱。