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Densities of Osmium and Iridium RECALCULATIONS BASED UPON A REVIEW OF THE LATEST CRYSTALLOGRAPHIC DATA
| Citations: | 2 - 0 self |
BibTeX
@MISC{Arblaster_densitiesof,
author = {J. W. Arblaster},
title = {Densities of Osmium and Iridium RECALCULATIONS BASED UPON A REVIEW OF THE LATEST CRYSTALLOGRAPHIC DATA},
year = {}
}
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Abstract
Much confusion exists in the literature con-cerning the densities of osmium and iridium. This has occurred because these values are calculated from crystallographic data, and errors in the absolute value of the X-ray wavelength scale, Avogadro’s Number, and the atomic weights of these elements have only slowly been resolved. Unfortunately density values have been published from time to time which have incorporated one or more of these errors, and these have become fixed in the literature and repeated ever since. The introduction of new values for Avogadro’s Number and the X-ray wavelength scale conversion factor (I), both of which have been used in the present calculations, is an apt moment to review the crystallographic data for these elements and to show that osmium is the densest metal. Avogadro’s Number is now (6.0221367 f 0.0000036) x IO*) per mol while the conversion factor from kX units to Angstrom units is 1.00207789 k 0.00000070. The equivalent Cu Ka, X-ray wavelength stan-dard is then 1.5405945 k O. ~ I I A and an earlier version of this value (I. 540598 A) has already been adopted by the U.S. National Bureau of Standards (2) as a wavelength stan-dard to replace the currently accepted conver-sion factor of I.00202. For iridium, which has a face-centred cubic structure, the density is calculated from:
Keyphrases
iridium recalculation based upon review latest crystallographic data avogadro number crystallographic data atomic weight angstrom unit present calculation x-ray wavelength scale x-ray wavelength stan-dard new value density value x-ray wavelength scale conversion factor face-centred cubic structure u.s. national bureau absolute value apt moment much confusion conver-sion factor kx unit conversion factor equivalent cu ka wavelength stan-dard
