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Heuser, Brent Zhang, Yang Serio, Joseph Anthony 2018-03-13T15:44:39Z 2018-03-13T15:44:39Z 2017-09-05 2017-12 Using quasielastic neutron scattering results from multiple spectrometers, material considerations are made for annealed and deformed PdH_x with sufficiently low [H] as to encourage the process of dislocation pipe diffusion (DPD) below a critical temperature. The results of this analysis indicate that the simultaneous comparison of QENS results from instrument with different instrumental resolution and energy transfer window can provide a more comprehensive picture of the diffusive modes seen within a system than using the instruments independently. A method is developed for accurately comparing the dynamic structure factor S_inc(Q,E) data of multiple instruments, using an inverse Fourier transform in order to obtain the intermediate scattering function F_inc(Q,t) for each instrument and simultaneously analyzing the output from three QENS spectrometers. An array of models are approached to describe the combined F_inc(Q,t), with the best description of F_inc(Q,t) for the deformed PdH_x found to be a summed KWW/single exponential fit. The results show that the DPD contribution to the F_inc(Q,t) can be well described using a stretched exponential (KWW) mode, which is qualitatively correlated to the heterogeneity of the diffusive modes expected for the near-core and inner core region of heavily deformed Pd. Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-03-13 without embargo terms The student, Joseph Serio, accepted the attached license on 2017-08-28 at 20:51. The student, Joseph Serio, submitted this Thesis for approval on 2017-08-28 at 21:03. This Thesis was approved for publication on 2017-09-05 at 10:02. DSpace SAF Submission Ingestion Package generated from Vireo submission #11620 on 2018-03-13 at 10:02:53 Made available in DSpace on 2018-03-13T15:44:39Z (GMT). No. of bitstreams: 2 SERIO-THESIS-2017.pdf: 32348193 bytes, checksum: d595672e81ce49630cf63f0f61a53658 (MD5) LICENSE.txt: 4209 bytes, checksum: 551df072bf03408bca2638d51f011210 (MD5) Previous issue date: 2017-09-05 application/pdf http://hdl.handle.net/2142/99282 en 2017 by Joseph Anthony Serio. All rights reserved. Dislocation pipe diffusion Hydrogen Palladium QENS neutron scattering Analysis of dislocation pipe diffusion in deformed alpha-phase PdHX using a synthesized QENS approach text text Nuclear, Plasma, & Rad Engr Nuclear, Plasma, Radiolgc Engr University of Illinois at Urbana-Champaign Thesis M.S.