Basic Aspects of X-Ray Absorption In Quantitative Diffraction Analysis of Powder Mixtures
Basic Aspects of X-Ray Absorption In Quantitative Diffraction Analysis of Powder Mixtures
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DOI：
10.1017/s0885715600016432
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发表时间：
1948-10
影响因子：
0.5
通讯作者：
L. Alexander;H. Klug
中科院分区：
文献类型：
--
作者：
L. Alexander;H. Klug
摘要以平面粉末试样表面衍射为例，建立了粉末混合物定量分析的数学关系。这些公式将衍射强度与样品的吸收特性联系起来。处理三种重要情况：(1)n组分混合；未知吸收粉等于基体吸收粉；浓度与强度成正比。允许直接分析。(2)二元混合；未知吸收粉不等于稀释剂的吸收粉；浓度与强度不成比例。通过合成混合物制备的校准曲线，可以进行直接分析。(3) n组分混合；未知数的吸收能力不等于矩阵的吸收能力；一般情况下。分析是通过添加内标准来完成的。浓度与来自未知的选定反射强度与来自内部标准的反射强度之比成正比。
Abstract The mathematical relationships are developed which are pertinent to the quantitative analysis of powder mixtures for the case of diffraction from the surface of a flat powder specimen. These formulas relate the diffracted intensity to the absorptive properties of the sample. Three important cases are treated: (1) Mixture of n components; absorbing powder of the unknown equal to that of the matrix; concentration proportional to intensity. Direct analysis is permitted. (2) Binary mixture; absorbing powder of the unknown not equal to that of the diluent; concentration not proportional to intensity. Direct analysis is possible by means of calibration curves prepared from synthetic mixtures. (3) Mixture of n components; absorbing power of the unknown not equal to that of the matrix; general case. Analysis is accomplished by the addition of an internal standard. Concentration is proportional to the ratio of the intensity of a selected reflection from the unknown to the intensity of a reflection from the internal standard.