通过X射线衍射分析(XRD)、傅里叶红外光谱分析(IR)和X射线光电子能谱分析(XPS)等测试手段,发现太行山东麓煤田部分煤层及其夹矸中含有铵伊利石,并对样品中的铵伊利石进行了详细的矿物学研究。分析结果表明:X射线衍射谱图上,铵伊利石的d₍₀₀₁₎值高于普通伊利石的d₍₀₀₁₎值(1.006nm),(002)衍射峰强度与(003)衍射峰强度相当,而普通伊利石的(002)衍射峰强度为24.4%,约为(003)衍射峰强度的1/3;对铵伊利石晶格常数进行了计算,太行山东麓煤田含煤地层中的铵伊利石空间群属于C2/m,晶胞参数a介于0.52133～0.52774nm之间,b介于0.89814~0.91693nm之间,c介于1.02538~1.05285nm之间,β介于101.127°~101.699°之间,z为2,体积介于0.47611~0.49224nm³之间,密度介于2545~2697e^-/nm³之间;研究区铵伊利石类型为1M多型;红外光谱曲线中,铵伊利石中的NH₄⁺ 变形振动峰范围为1427.58~1431.95 cm^-1;铵伊利石的NH₄⁺ 的N 1s XPS结合能为402.4eV。

Ammonium illite that belongs to 2:1 layered silicate minerals is a kind of di-octahedral mica-like clay minerals, and it is the isomorphism of illite, in which the K⁺ was substituted by the NH₄⁺. By means of XRD, IR and XPS, ammonium illite was discovered in some coals and coal partings of Eastern Taihang Piedmont Coalfields, and mineralogical researches were studied in detail. The result of XRD spectrogram shows that ammonium illite's X-ray diffraction peak of d₍₀₀₁₎ is higher than that of ordinary illite, whereas its (002) and (003) diffraction peak intensity is similar. but the ordinary illite's(002)diffraction peak intensity is 24.4%, which is about 1/3 of the (003) diffraction peak intensity. Lattice parameters about ammonium illite in the investigative area are calculated, and the results show that its space group is C2/m, with every parameters including a (0.52133nm to 0.52774nm), b (0.89814nm to 0.91693nm), c (1.02538nm to 1.05285nm), β(101.127° to 101.699°), z (2, volume is 0.47611nm³ to 0.49224nm³), density (2545 e^-/nm³ to 2697e^-/nm³). The above descriptions indicate that the ammonium illite is 1M polytype. The results of IR spectrogram demonstrated that the deformation vibration peak of NH₄⁺ range from 1427.58cm^-1 to 1431.95cm^-1, and the N 1s XPS banding energy of NH₄⁺ is 402.4eV. In nature the ammonium illite-illite solid solution is more general than pure ammonium illite. Thus, mostly ammonium illite contains a certain amount of K. Therefore, the K 2p peak is often observed by the XPS spectra.