Houston, William V.2016-04-222016-04-221962Carroll, Keith James. "Elastic constants and thermal expansion of niobium as a function of temperature." (1962) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/90161">https://hdl.handle.net/1911/90161</a>.https://hdl.handle.net/1911/90161The three Independent elastic constants of the bcc niobium structure have been determined as a function of temperature over the range 4.2°-300°K, using an ultrasonic pulse technique - the propagation of 10 Me waves in preferred directions in the crystal specimen. Values obtained at 4.2°K are, in units of 10 dyne/cm2, c11 = 25.27 +/- 0.6%, c44 = 3.10 +/- 0.6%, c12 = 13.32 +/- 3.3%. A few measurements were also carried out on the thermal expansion of niobium, from 140°-280°K, and this quantity determined at a function of the temperature. The average expansion coefficient over the whole range studied was 6.24x10 to the -6th deg -1, which agreed moderately well with earlier work by other investigators.36 ppengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.ThesisRICE1197reformatted digitalThesis Phys. 1962 Carroll