Wang, C. C.2018-12-182018-12-181985Laaksonen, Reima Tapani. "Short range order in lattice dynamics and the feasibility of exafs measurements." (1985) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104195">https://hdl.handle.net/1911/104195</a>.https://hdl.handle.net/1911/104195We studied theoretically the kinetics of a bcc lattice near the critical temperature. Our motivation is to examine the feasibility of using the recently developed time-resolved EXAFS technique to study the lattice dynamics. We derived the kinetic equations using the quasi-chemical approximation and keeping the number of particles constant and allowing only atom-vacancy exchange process. We solved these equations for a relaxation process following a sudden temperature change. Our calculations show that the long-range order exhibits critical slowing-down, as expected. Also the non-linear coupling between short- and long-range order was observed. Because of this non-linear coupling the relaxation of the short-range also slows down near the critical temperature. Our results put stringent conditions on possible experiments.64 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.ThesisRICE1822reformatted digitalThesis Phys. 1985 Laaksonen