Density measurements of molten materials at high pressure using synchrotron X-ray radiography. Melting volume of FeS. Book Chapter

Chen, J, Weidner, DJ, Wang, L et al. (2005). Density measurements of molten materials at high pressure using synchrotron X-ray radiography. Melting volume of FeS. . 185-194. 10.1016/B978-044451979-5.50011-9

cited authors

  • Chen, J; Weidner, DJ; Wang, L; Vaughan, MT; Young, CE

authors

abstract

  • This chapter describes a new technique for density measurement of molten materials in a multi-anvil press using synchrotron X-ray radiography. This technique takes advantage of a linear conversion of X-ray intensity to radiograph brightness; and records two-dimensional variations in transmitted X-ray intensities across a reference sphere in the sample on a single exposure. Comparing with the existing technique of one-dimensional scan using a small beam of X-rays for the melt density measurement at high pressure, this method gains a shorter data collection time and larger data coverage (two-dimensional). This experiment demonstrates an accuracy of 1% for the density measurement with respect to X-ray diffraction method for crystalline phase. Although the use of two-dimensional data can improve the accuracy of the density measurement, there are still some sources of experimental error. This includes the imperfectness of the spherical shape of the reference sphere and the cylindrical shape of the sample; and the error in the density calculation due to the less uniformity of the thickness of cell components (e.g., capsule, heater, insulation sleeve and pressure medium) in the X-ray path upon compression. The brightness of the X-ray radiograph image from a Yttrium aluminium garnet (YAG) single-crystal fluorescent screen has a linear response to the intensity of incident X-rays. The use of an X-ray radiograph in measuring the density of the non-crystalline material avoids point-by-point scanning in data collection, increases the number of data from one dimension to two-dimension, and therefore, improves the data statistics and precision. © 2005 Copyright © 2005 Elsevier B.V. All rights reserved.

publication date

  • December 1, 2005

Digital Object Identifier (DOI)

start page

  • 185

end page

  • 194