广西伊岭岩岩石(CaCO3)晶体结构、德拜温度以及硬度研究

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

关键词:  伊岭岩  X射线衍射  晶体结构  德拜温度

Key words:  Yilingyan  X-ray diffraction  crystal structure  Debye temperature

摘要:

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（A₁、A₂）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CaCO₃，其中A₁样品含有少量的K⁺，A₂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A₁主要物相CaCO₃中的Ca²⁺，使其点阵参数变大，单胞体积变大。同样A₂样品中的Na⁺替代了样品中CaCO₃的Ca²⁺位置，造成A₂中的CaCO₃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318.86 K、324.82 K。维氏硬度测试法测试出2个样品的硬度大小分别为132.6 HV、148.9 HV。

Abstract:

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.