Potential Applications of the X-Ray/Density Method for the Comparison of Atomic-Weight Values
| العنوان: | Potential Applications of the X-Ray/Density Method for the Comparison of Atomic-Weight Values |
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| المؤلفون: | John S. Thomsen, J. A. Bearden, H. Steffen Peiser, R D Deslattes |
| المصدر: | Metrologia. 2:104-111 |
| بيانات النشر: | IOP Publishing, 1966. |
| سنة النشر: | 1966 |
| مصطلحات موضوعية: | Crystal, Materials science, Silicon, chemistry, Lattice (order), Chemical nomenclature, General Engineering, X-ray, chemistry.chemical_element, Natural abundance, Crystal structure, Atomic mass, Computational physics |
| الوصف: | Without presenting experimental details, this report outlines and reappraises the principles involved in measurement of crystal lattice parameters and density for the determinations of atomic-weight values. Attention is drawn to the advantages to be derived from a comparison of densities and lattice spacings with those of a crystal of mononuclidic elements, rather than from absolute measurements of X-ray spacings and density. Errors arising from physical and chemical imperfections are discussed as are the general techniques of adequate precision for density and lattice spacings measurements. Recent literature data are used by way of illustration to derive the effective atomic weight of calcium appertaining to a group of calcite samples from that of a group of silicon crystals (not an optimum "standard"). The calcium value obtained is 40.0795 ± 0.0019 (probable error); it compares with IUPAC's adopted 40.08 and a "physical value" of 40.078 from nuclidic masses and isotopic abundance measurements. There are several elements for which the X-ray/density method is judged to be potentially the most promising for atomic weight re-determinations in the foreseeable future. |
| تدمد: | 1681-7575 0026-1394 |
| DOI: | 10.1088/0026-1394/2/3/003 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::f3ff836f8ed0eaa5947845cec873c7c9 https://doi.org/10.1088/0026-1394/2/3/003 |
| رقم الانضمام: | edsair.doi...........f3ff836f8ed0eaa5947845cec873c7c9 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 16817575 00261394 |
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| DOI: | 10.1088/0026-1394/2/3/003 |