"The physical properties of chromium and vanadium are so important that a study of their lattice constants and their coefficients of thermal expansion, requires special consideration.
A number of research workers, over a period of about forty years, have done considerable work in determining the above constants. Some of the previous investigators found an anomaly in the thermal expansion, electrical resistivity and other physical properties of chromium. They observed that at about 37°C, chromium showed a discontinuity in the above physical properties. However it is not known what causes the discontinuity in the expansivity curve of chromium. The discontinuity may be due to the dissolved gases in the chromium metal.
So accordingly, a study of nitrogen loaded samples of chromium were studied as to the possibility of nitrogen causing the break in the thermal expansion curve.
The presence of impurities has caused difficulties in the study of the physical properties of another metal, vanadium. Different investigators have determined the lattice parameter of vanadium and their studies resulted in values showing considerable variation. The reason for this variation in the values of lattice parameter for vanadium is usually ascribed to the presence of impurities, e.g. in the form of gases.
This suggested the need for further work to determine the exact lattice parameter and coefficient of thermal expansion of vanadium and to find the reason for the variation in the values of the lattice constant"--Introduction, pages 1-2.
James, William Joseph
Straumanis, Martin E., 1898-1973
Strunk, Mailand R., 1919-2008
Johnson, Charles A.
Chemical and Biochemical Engineering
M.S. in Chemical Engineering
National Science Foundation (U.S.)
Missouri School of Mines and Metallurgy
vi, 72 pages
© 1960 Paluri Bhimeswara Rao, All rights reserved.
Thesis - Open Access
Crystal lattices -- Mathematical models
Expansion (Heat) -- Measurement
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Rao, Paluri Bhimeswara, "The lattice constants of chromium and vanadium containing dissolved gases" (1960). Masters Theses. 2805.