Evaluation of Quantitative Electron Microprobe Analyses of Multiphase Microcrystalline Refractory Materials
An appropriate test for homogeneity of composition of standards and of unknown samples is an analysis of variance of the intensity ratios of the components within the grains opposed to the variance between the grains under conditions of constant beam current capacitor change. Replication of analyses is necessary to distinguish inherent instrumental variation from actual chemical inhomogeneities present in the samples. This replication permits an estimate of the imprecision caused by inhomogeneities and the statistical variation of X-ray quanta. The total uncertainty of an analysis is the sum of systematic error—primarily reference standard uncertainty—and the imprecision. For multiphase mixtures of microcrystalline refractory oxide material, an uncertainty of ± 2% of the amount of oxide component present in a given phase should be considered a good analysis. This value is based on experimental work in the system MgO-FeO-Fe2O3-SiO2.
KeywordsElectron Microprobe Oxygen Fugacity Oxide Component Refractory Oxide Multiphase Mixture
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