Derek Lawther

Description

Details

NameDerek Lawther
PositionFaculty Member
Emaildlawther@upei.ca
Department(s)Physics
Phone(902) 566-0338
BuildingDuffy Science Centre 408
Websitehttp://physics.upei.ca/faculty/profile/derek-w-lawther

Derek Lawther

Biography

Education: B.Sc., (Hon.), Dalhousie University (1987); M.Sc., Dalhousie University (1988); Ph.D., Dalhousie University (1993)

Dr. Derek Lawther, an experimental physicist, uses positron annihilation to identify defects in materials such as metals. He probes for defects at the atomic level and works to understand better how to manipulate these defects to produce enhanced physical properties such as increased strength or conductivity.


Recent Citations


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Research Interests

  • Investigation of the links between atomic-scale defects in materials and their corresponding macroscopic physical properties
  • Positron annihilation spectroscopy

Other Scholars in Physics

Citations

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TitleAuthor(s)
On the electrical deactivation of arsenic in siliconMyler, U.; Simpson, P. J.; Lawther, Derek W.; Rousseau, P. M.
Positron-beam techniques for materials characterizationLawther, Derek W.; Simpson, P. J.
Chemical information in positron annihilation spectraMyler, U.; Goldberg, R. D.; Knights, A. P.; Lawther, Derek W.; Simpson, P. J.
Positron beam study of annealed silicon nitride filmsLandheer, D.; Aers, G. C.; Sproule, G. I.; Lawther, Derek W.; Simpson, P. J.; Massoumi, G. R.; Tong, S. Y.
Analysis of x-ray powder diffraction patterns of rapidly quenched A1-based alloys on the basis of quasicrystalline and cubic modelsDunlap, R. A.; Lawther, Derek W.; Srinivas, V.
Experimental identification of nitrogen-vacancy complexes in nitrogen implanted siliconAdam, Lahir Shaik; Law, Mark E.; Szpala, Stanislaw; Simpson, P. J.; Lawther, Derek W.; Dokumaci, Omer; Hegde, Suri
A Doppler broadening positron annihilation technique for the study of defects in bulk samplesDunlap, R. A.; Kyriakidis, J.; Wang, Z.; Lawther, Derek W.
Vacancy generation resulting from electrical deactivation of arsenicLawther, Derek W.; Myler, U.; Simpson, P. J.; Rousseau, P. M.; Griffin, P. B.; Plummer, J. D.
In situ 64Cu Doppler-broadening positron-annihilation methods for elevated temperature study of defect formation in metals formation in metalsLawther, Derek W.; Dunlap, R. A.
Thermal expansion of Bi2.2Sr1.8CaCu2Ox superconductor single crystalsYang, Z. J.; Yewondwossen, M.; Lawther, Derek W.; Ritcey, S. P.; Geldart, D. J. W.; Dunlap, R. A.
Mossbauer-effect study of nondimensional and 2-dimensional quasi-crystalline alloys in the Al-Pd-Fe systemDunlap, R. A.; Wang, Z.; Lawther, Derek W.
Variable-energy positron beam study of arsenic diffusion in poly-siliconLawther, Derek W.; Khatri, R.; Simpson, P. J.; Schultz, P. J.; Calder, I.; Weaver, L.
Electrical transport in amorphous Fe-Mn-Zr alloysSrinivas, V.; Nigam, A. K.; Chandra, G.; Lawther, Derek W.; Yewondwossen, M.; Dunlap, R. A.
Positron-annihilation study of equilibrium defects in Al-Cu-Fe face-centered-icosahedral quasicrystalsLawther, Derek W.; Dunlap, R. A.
ence Dunlap R., Yewondwossen M., and Lawther D., (1993) Mossbauer effect studies of amorphous Al-Y-Ni-Fe alloysDunlap, R. A.; Yewondwossen, M. H.; Lawther, Derek W.
Physical properties of amorphous Al-Gd-transition metal alloysDunlap, R. A.; Lawther, Derek W.; Mchenry, M. E.; Srinivas, V.; Beydaghyan, G.
Mossbauer effect studies of local Fe environments in crystalline and quasicrystalline Al-Cu-Fe alloysLawther, Derek W.; Dunlap, R. A.
Mössbauer effect study of the stable Al75Pd15Fe10 decagonal quasicrystalLawther, Derek W.; Dunlap, R. A.
Positron annihilation study of Al63Cu25Fe12 as a function of thermal treatmentLawther, Derek W.; Dunlap, R. A.
Structural and Mossbauer effect studies of quasicrystalline Al-Pd-Cr-Fe alloysWang, Z.; Dunlap, R. A.; Lawther, Derek W.
57Fe Mössbauer-effect studies of quadrupole splitting distributions in icosahedral Al-TM-Fe quasicrystalsLawther, Derek W.; Dunlap, R. A.; Srinivas, V.; Lloyd, D. J.; Jha, S.
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Cu-T (T=Fe,V) alloysLawther, Derek W.; Beydaghyan, G.; Dunlap, R. A.
Transition metal site distributions in binary aluminum-transition metal quasicrystals: Al-V and Al-CrLawther, Derek W.; Lloyd, D. J.; Dunlap, R. A.
Structure and stability of rapidly quenched Al86Cr14−xFex alloysLawther, Derek W.; Dunlap, R. A.; Lloyd, D. J.; Mchenry, M. E.
On the question of stability and disorder in icosahedral aluminum - transition metal alloysLawther, Derek W.; Dunlap, R. A.; Srinivas, V.
Correlated hyperfine interactions in amorphous Cr72-xFexC17Si8Al3 alloysDunlap, R. A.; Lawther, Derek W.; Hargraves, P.; Sinclair, P.
57Fe Mössbauer-effect study of preferential site occupancy in quasicrystalline Al86Cr14−xFex alloysDunlap, R. A.; Lawther, Derek W.; Lloyd, D. J.
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Mn-Si alloysDunlap, R. A.; Lawther, Derek W.; March, R. H.
Application of Mössbauer effect spectroscopy to the study of quasicrystalline materialsDunlap, R. A.; Lawther, Derek W.

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TitleTimes viewedLast viewed
On the electrical deactivation of arsenic in silicon - ir:ir-batch6-169610023:24:18 2013-05-19
Positron-beam techniques for materials characterization - ir:ir-batch6-17627304:15:22 2013-05-22
Chemical information in positron annihilation spectra - ir:ir-batch6-16976820:54:09 2013-05-21
Positron beam study of annealed silicon nitride films - ir:ir-batch6-16998102:37:54 2013-05-23
Analysis of x-ray powder diffraction patterns of rapidly quenched A1-based alloys on the basis of quasicrystalline and cubic models - ir:ir-batch6-17216900:19:30 2013-05-21
Experimental identification of nitrogen-vacancy complexes in nitrogen implanted silicon - ir:ir-batch6-17228102:53:07 2013-05-19
A Doppler broadening positron annihilation technique for the study of defects in bulk samples - ir:ir-batch6-16987711:24:47 2013-05-21
Vacancy generation resulting from electrical deactivation of arsenic - ir:ir-batch6-17007218:49:29 2013-05-21
In situ 64Cu Doppler-broadening positron-annihilation methods for elevated temperature study of defect formation in metals formation in metals - ir:ir-batch6-17017915:16:11 2013-05-20
Thermal expansion of Bi2.2Sr1.8CaCu2Ox superconductor single crystals - ir:ir-batch6-17028800:45:58 2013-05-19
Mossbauer-effect study of nondimensional and 2-dimensional quasi-crystalline alloys in the Al-Pd-Fe system - ir:ir-batch6-17037503:24:57 2013-05-21
Variable-energy positron beam study of arsenic diffusion in poly-silicon - ir:ir-batch6-17047202:34:52 2013-05-21
Electrical transport in amorphous Fe-Mn-Zr alloys - ir:ir-batch6-17057906:18:16 2013-05-22
Positron-annihilation study of equilibrium defects in Al-Cu-Fe face-centered-icosahedral quasicrystals - ir:ir-batch6-17066020:39:33 2013-05-19
ence Dunlap R., Yewondwossen M., and Lawther D., (1993) Mossbauer effect studies of amorphous Al-Y-Ni-Fe alloys - ir:ir-batch6-17078006:02:51 2013-05-23
Physical properties of amorphous Al-Gd-transition metal alloys - ir:ir-batch6-17087011:48:37 2013-05-22
Mossbauer effect studies of local Fe environments in crystalline and quasicrystalline Al-Cu-Fe alloys - ir:ir-batch6-17098018:16:58 2013-05-22
Mössbauer effect study of the stable Al75Pd15Fe10 decagonal quasicrystal - ir:ir-batch6-17107805:38:21 2013-05-20
Positron annihilation study of Al63Cu25Fe12 as a function of thermal treatment - ir:ir-batch6-17117906:46:24 2013-05-23
Structural and Mossbauer effect studies of quasicrystalline Al-Pd-Cr-Fe alloys - ir:ir-batch6-17127218:28:26 2013-05-21
57Fe Mössbauer-effect studies of quadrupole splitting distributions in icosahedral Al-TM-Fe quasicrystals - ir:ir-batch6-17137115:55:38 2013-05-20
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Cu-T (T=Fe,V) alloys - ir:ir-batch6-17147120:29:03 2013-05-18
Transition metal site distributions in binary aluminum-transition metal quasicrystals: Al-V and Al-Cr - ir:ir-batch6-17157822:36:45 2013-05-22
Structure and stability of rapidly quenched Al86Cr14−xFex alloys - ir:ir-batch6-17168007:03:15 2013-05-22
On the question of stability and disorder in icosahedral aluminum - transition metal alloys - ir:ir-batch6-17178913:22:50 2013-05-21
Correlated hyperfine interactions in amorphous Cr72-xFexC17Si8Al3 alloys - ir:ir-batch6-17187206:10:05 2013-05-20
57Fe Mössbauer-effect study of preferential site occupancy in quasicrystalline Al86Cr14−xFex alloys - ir:ir-batch6-17197020:52:40 2013-05-20
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Mn-Si alloys - ir:ir-batch6-17207020:02:00 2013-05-22
Application of Mössbauer effect spectroscopy to the study of quasicrystalline materials - ir:ir-batch6-17636618:47:55 2013-05-21