赤泥黑色玻璃晶化过程的红外光谱研究

Infrared Spectra of Crystallization of Glasses Using Red Mud as Raw Materials

本文利用红外吸收光谱（ＩＲ）和Ｘ射线衍射（ＸＲＤ）对赤泥黑色玻璃及其晶化过程的结构进行了研究．结果表明：赤泥黑色玻璃晶化析出主晶相为钙铁透辉石，次晶相为钙黄长石．玻璃网络中主要有 ＳｉＯ_４、 ＡｌＯ_４及 Ｆｅ^（３＋）Ｏ_４四面体结构单元，玻璃结构中具有和钙铁透辉石结构类似的近程排列，这个近程排列具有析出主晶相（钙铁透辉石）的先驱结构．随核化时间延长及晶化温度提高，红外最强吸收带朝低波数方向移动，吸收带强度随晶化温度的提高而明显增大．随Ｆｅ_２Ｏ_３含量增加，网络无序度增大，玻璃红外吸收谱带也向低波数方向移动．

FTIR absorption spectra and XRD were used to study the structure of glasses using red mud as raw materials. The results indicate that Ca(Fe, Mg)Si_2O_6 and 2C_aO.AL_2O_3.SiO_2 precfpitate as primary and minor crystalline phase respectively on crystallization processes of glasses. Glasses have interlinked SiO_4, AIO_4 and Fe(3+)O_4 tetrahedra as their most fundamental units with K^+, Na^+, Fe^(2+) and some Fe^(3+) ions acting as charge balancing canons. The shortrange order which is similar to the structure of Ca(Fe, Mg)Si_2O_6 exists in the glasses and has the precursor structures of primary crystalline phase. With the increase of Fe_2O_3 content, the random state of glass structure increases. The absorption bands of FTIR spectra become broaden and shift from the high frequency region to lower frequencies. With prolonging nucleation time and improving crystallization temperature, the strongest absorption bands also shift from the high frequency region to lower frequencies.