Abstracts of the Hyperfine Interaction Group

Hyperfine Interactions Group

Department of Physics

Washington State University

Pullman, WA 99164-2814, USA

Meetings Abstracts

11th Annual Meeting of the Northwest Section of the American Physical Society, May 14-16, 2009, Vancouver, BC (conference web pag e)

Atom movement in solids studied using PAC spectroscopy, Gary S. Collins (invited oral presentation)
Jump frequencies of tracer atoms on Al-sites in Al4Ba phases, Randal Newhouse and Gary S. Collins (oral presentation by Newhouse)
Calculation of formation energies of intrinsic point defects in In3La, John P. Bevington and Gary S. Collins (oral presentation by Bevington)

International Workshop on Research Reactor Utilization: 50 Years of Safe and Sustainable Operation of the IEA-R1 Research Reactor, São Paulo, Brazil, December 3-6, 2007 (conference web page)

Hyperfine interaction studies of local environments of probe atoms in intermetallic compounds, Gary S. Collins (invited)

XIV International Conference on Hyperfine Interactions, Iguassu Falls, Brazil, August 6-10, 2007 (conference web page)

Site preferences of 111In probe atoms in intermetallics having the Al3Ti or Al3Zr crystal structures, John P. Bevington, Farida Selim and Gary S. Collins (plenary oral presentation)
Diffusion of 111Cd probes in Ga7Pt3 studied by nuclear quadrupole relaxation, Farida Selim, John P. Bevington and Gary S. Collins

International Symposium on Defects, Transport and Related Phenomena; Materials Science and Technology 2006 Conference, Cincinnati, October 11-19, 2006 (symposium web page)

Tracer jump frequencies on inequivalent Ga sublattices in Ga7Pd3: experiment, Gary S. Collins, Egbert R. Nieuwenhuis and Matthew O. Zacate
Tracer jump frequencies on inequivalent Ga sublattices in Ga7Pd3: stochastic models, Matthew O. Zacate and Gary S. Collins

International Conference on Diffusion and Stresses, Lillafüred, Hungary, September 19-22, 2006 (conference web page)

Simultaneous measurement of tracer jump frequencies on different sublattices, Gary S. Collins, Egbert R. Nieuwenhuis and Matthew O. Zacate (plenary oral presentation)

2006 TMS Annual Meeting, Symposium on Point Defects in Materials, San Antonio, March 12-16, 2006 (conference web page)

Atom-scale studies of solids using hyperfine interactions, Gary S. Collins (invited presentation)

International Conference on Nonstoichiometric Compounds, Kauai, Hawai'i, April 3-8, 2005 (conference web page)

Nonstoichiometry in line compounds, Gary S. Collins (plenary oral presentation).

XIII International Conference on Hyperfine Interactions (HFI2004), Bonn, August 23-27, 2004

PAC studies of diffusion using nuclear quadrupole relaxation, Gary S. Collins, Aurélie Favrot, Li Kang , Egbert Nieuwenhuis, Denys Solodovnikov, Jipeng Wang and Matthew O. Zacate (invited paper)
Polymorphic phase transformation in In₂La, Egbert R. Nieuwenhuis, Aurélie Favrot, Matthew O. Zacate and Gary S. Collins

International Conference on Diffusion in Materials (DIMAT2004), Kraków, July 18-23, 2004

Atom jump frequency in compounds measured using nuclear quadrupole relaxation, G. S. Collins, A. Favrot, D. Solodovnikov and M. O. Zacate

Jump frequency of Cd tracer atoms in beta-Mn, Matthew O. Zacate and Gary S. Collins

Clay Minerals Society , 41st Annual Meeting (CMS2004), Richland, Washington, June 19-24, 2004

An interpretation of octahedral ordering and site occupancies of Fe2+ in muscovite and illite, Gary S. Collins and Philip Rosenberg (PowerPoint Presentation)

American Physical Society, Fifth Northwest Section Meeting (NWS04), Moscow, Idaho and Pullman, Washington, May 21-22, 2004

Atom movement in solids studied using nuclear quadrupole relaxation, Session J1.001; Gary S. Collins, Aurelie Favrot, Li Kang, Egbert Nieuwenhuis, Denys Solodovnikov, Jipeng Wang and Matthew O. Zacate (invited paper)
Nuclear Quadrupolar Relaxation in LaSn₃, Session J1.003; Jipeng Wang, Egbert Nieuwenhuis, Matthew O Zacate, Gary S Collins
Polymorphic phase transformation in In₂La, Session J1.002; Egbert R. Nieuwenhuis, Aurelie Favrot, Matthew O. Zacate, Gary S. Collins
Temperature- and Composition-Driven Changes in Sites Occupied by Indium in GdAl₂, Session H3.001; Matthew O. Zacate, Gary S. Collins (invited paper)

March Meeting, American Physical Society, Austin, 2003: Session S16 - Metals: Defects to Alloys

Thermally driven change in sites occupied by indium solutes in GdAl₂ , Matthew O. Zacate and Gary S. Collins (Washington State Univ.), [S16.009]
Diffusion of Cd in REIn₃ (RE=La, Nd, Gd) measured using PAC, Gary S. Collins and Matthew O. Zacate (Washington State Univ.) [S16.008]

March Meeting, American Physical Society, Austin, 2003: Session V35 - Metals: Synthesis and Measurement [V35.016]

Diffusivity of Cd in beta-Mn and beta-Mn(Al) studied by PAC, Matthew O. Zacate, Gary S. Collins (Washington State Univ.)

March Meeting of the American Physical Society, Seattle, 2001, abstract Z18.001.

Equilibrium defects and solute site preferences in intermetallics: I. thermodynamics, Gary S. Collins and Matthew O. Zacate (Washington State Univ.)

March Meeting of the American Physical Society, Seattle, 2001, abstract Z18.002.

Equilibrium defects and solute site preferences in intermetallics: II. experiment, Matthew O. Zacate and Gary S. Collins (Washington State Univ.)

March Meeting of the American Physical Society, Seattle, 2001, abstract Z18.006.

Site preferences of solutes in the two-phase field between Pd₃Ga₇ and PdGa, Bonner C. Walsh, Matthew O. Zacate and Gary S. Collins (Washington State Univ.)

International Chemical Congress of Pacific Basin Societies, Pacifichem 2000, Symposium 27: Nuclear hyperfine and exotic particle techniques for studying chemical states, Honolulu, December 2000

Hyperfine studies of point defects in intermetallic compounds, Gary S. Collins (invited). Abstract: Many intermetallic phases enjoy wide ranges of composition because of the screening out of coulomb interactions by conduction electrons. For example, NiAl retains the B2 (CsCl) structure between 45 and 65 at.% Ni. Deviations from stoichiometry are accomodated by structural defects such as antisite atoms and lattice vacancies. Additional point defects may be present at high temperature or in non-equilibrated samples, but only in combinations that preserve the average composition of the phase. In this laboratory, we have been applying perturbed angular correlation of gamma rays (PAC) and Mössbauer effect to detect point defects via their hyperfine interactions, to measure properties such as formation and migration energies, and to study defect-defect interactions. Signals from different defects in the atomic shells closest to probe atoms are well resolved, removing ambiguity in the interpretation of measurement. The paper will present a brief overview of this work and illustrations from recent studies.

Earlier Meetings

Oxidation and phase changes of FeRh quenched in water, Luke S.-J. Peng and Gary S Collins, Materials Research Society, Fall Meeting, Boston, December 1998.

Equilibrium defects in TiAl, M. Wei and G.S. Collins, American Physical Society, March Meeting 1997, more information.

Mössbauer measurements of antiferromagnetic FeRh, L.S.J. Peng and G.S. Collins, American Physical Society, March Meeting 1997, more information.

Point defect formation enthalpies measured at high temperature by PAC, B. Bai and G.S. Collins, American Physical Society, March Meeting 1996.

Observation of the Schottky defect in quenched PdIn, P. Sinha and G.S. Collins, American Physical Society, March Meeting 1995.

Lattice disorder in annealed B2 FeAl, L.S.J. Peng and G.S. Collins, American Physical Society, March Meeting 1995.

Point-charge calculations of electric-field gradients near grain boundaries, B. Bai and G.S. Collins, American Physical Society, March Meeting 1995.

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