Ruan H D, Frost R L, Kloprogge J T, Duong L
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, Brisbane, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2002 Mar 15;58(5):967-81. doi: 10.1016/s1386-1425(01)00574-1.
Fourier transform infrared microscopy has been used to investigate in situ dehydroxylation of goethite to form hematite. The characterisation was based on the behaviour of hydroxyl units, which were observed in the hydroxyl stretching and hydroxyl deformation and water bending regions, and the Fe-O vibrations of the newly formed hematite during the thermal dehydroxylation process. Two hydroxyl stretching modes (v1 and v2), and three bending (V(bending-1, 2, 3)) and two deformation (V(deformation-1, 2)) modes were observed for goethite. The characteristic vibration at 916 cm(-1) was observed together with the residuals of the v1 and v2 bands in hematite spectrum. The structural transformation between goethite and hematite through thermal dehydroxylation was interpreted in order to provide criteria that can be used for the characterisation of thermally activated bauxite and their conversion to activated alumina phases.
傅里叶变换红外显微镜已被用于研究针铁矿原位脱羟基形成赤铁矿的过程。表征基于羟基单元的行为，这些羟基单元在羟基伸缩、羟基变形和水弯曲区域以及热脱羟基过程中新形成的赤铁矿的铁 - 氧振动中被观察到。针铁矿观察到两种羟基伸缩模式（v1和v2），以及三种弯曲（V（弯曲 - 1、2、3））和两种变形（V（变形 - 1、2））模式。在赤铁矿光谱中观察到916 cm(-1)处的特征振动以及v1和v2带的残余。通过热脱羟基对针铁矿和赤铁矿之间的结构转变进行了解释，以便提供可用于表征热活化铝土矿及其转化为活性氧化铝相的标准。
