Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-10T05:02:35.674Z Has data issue: false hasContentIssue false
  • English
  • Français

Evaluation of Quantitative Electron Microprobe Analyses of Multiphase Microcrystalline Refractory Materials*

Published online by Cambridge University Press:  06 March 2019

David H. Speidel
David H. Speidel*
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania
Get access

Abstract

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 in homogeneities 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.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 9: Fourteenth Annual Conference on Applications of X-ray Analysis, August 25-27, 1965 , 1965 , pp. 259 - 264
Copyright
Copyright © International Centre for Diffraction Data 1965

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Contribution No. 64-44 from the College of Mineral Industries, The Pennsylvania State University, University Park, Pennsylvania.

References

1. “3rd International Symposium on X-Ray Optics and X-Ray Microanalysis”, 1962, Stanford, California.Google Scholar
2. “Abstracts of the 1964 Fall Meeting, The Electrochemical Society, Inc., 2, no. 2, Electrothermics and Metallurgy Division, Electron Probe Techniques”, 1964, Washington, D.C.Google Scholar
3. Speidel, D. H., Thesis, “Element Distribution Among Coexisting Phases in the System MgO-FeO-Fe2O3-SiO2-TiO2 as a Function of Temperature, Oxygen Fugacity, and Bulk Composition,” 1964.Google Scholar
4. Speidel, D. H. and Osborn, E. F., “Element Distribution Among Coexisting Phases in the System MgO-FeO-Fe2O3-SiO2-TiO2 as a Function of Temperature, Oxygen Fugacity, and Bulk Composition,” Geol. Soc. Am., Miami Beach, Florida, November, 1964 (abstract).Google Scholar
5. Muan, A. and Osborn, E. F., “Phase Equilibria at Liquidus Temperatures in the System MgO-FeO-Fe2O3-SiO2,” J. Am. Ceram, Soc. 39: 121–140, 1956.Google Scholar
6. Phillips, B., Somiya, S., and Muan, A., “Melting Relations of Magnesium Oxide-Iron Oxide Mixtures in Air,” J. Am. Ceram. Soc. 44: 167–169, 1961.Google Scholar
7. Arkin, H. and Colton, R. R., Tabler for Statisticians, College Outline Series, Barnes and Noble, Inc., New York, 1963, pp. 122–125.Google Scholar