广西伊岭岩岩石(CaCO3)晶体结构、德拜温度以及硬度研究

本文从微观角度研究碳酸钙矿石的晶体结构与物理性能,为碳酸钙矿石的应用提供理论依据。利用X射线衍射(XRD)技术分析广西伊岭岩岩石2个样品(A_1、A_2)的相组成及其晶体结构,并利用带能谱仪的电子显微镜(SEM/EDS)测试这2个样品的各相成分。结果表明:广西伊岭岩岩石的主要成分为CaCO_3,其中A_1样品含有少量的K~+,A_2样品含有少量Na~+。通过Rietveld全谱图拟合晶体结构精修可知,K~+替代样品A_1主要物相CaCO_3中的Ca~(2+),使其点阵参数变大,单胞体积变大。同样A_2样品中的Na~+替代了样品中CaCO_3的Ca~(2+)位置,造成A_2中的CaCO_3点阵参数变小,单胞体积变小。德拜温度近似模型计算出2个样品的德拜温度分别为318.86K、324.82K。维氏硬度测试法测试出2个样品的硬度大小分别为132.6HV、148.9HV。

Study on Crystal Structure, Debye Temperature and Hardness of the Yilingyan Rock (CaCO3) in Guangxi

The crystal structure and physical properties of calcium carbonate ore was studied from a microscopic perspective to provide a theoretical basis for the application of calcium carbonate ore. The phase components of the two samples (A₁,A₂) were tested by electron microscopy with an energy spectrometer (SEM/EDS).The phase composition and crystal structure of two samples from the Yilingyan rock in Guangxi Province were analyzed by X-ray diffraction (XRD). The results show that the main phase component of the Yilingyan rock is CaCO₃, and the A₁ sample contains a small amount of K⁺,A₂ sample contains a small amount of Na⁺. Through the Rietveld crystal structure refinement, it is known that the K⁺ replaces the Ca²⁺ in the main phase CaCO₃ of the sample A₁, the lattice parameter and the unit cell volume become larger. Similarly, the Na⁺ replaces the Ca²⁺ in the main phase CaCO₃ of the sample A₂, the lattice parameter and unit cell volume become smaller. The Debye temperature of the two samples calculated by the Debye temperature approximation model is 318.86 K and 324.82 K, respectively. The hardness of the two samples tested by the Vickers hardness test is 132.6 HV and 148.9 HV, respectively.