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 annihilation study of Al63Cu25Fe12 as a function of thermal treatmentLawther, Derek W.; Dunlap, R. A.
Mössbauer effect study of the stable Al75Pd15Fe10 decagonal quasicrystalLawther, 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.
Mossbauer effect studies of local Fe environments in crystalline and quasicrystalline Al-Cu-Fe alloysLawther, Derek W.; Dunlap, R. A.
A Doppler broadening positron annihilation technique for the study of defects in bulk samplesDunlap, R. A.; Kyriakidis, J.; Wang, Z.; Lawther, Derek W.
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.
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.
Positron-beam techniques for materials characterizationLawther, Derek W.; Simpson, P. J.
Correlated hyperfine interactions in amorphous Cr72-xFexC17Si8Al3 alloysDunlap, R. A.; Lawther, Derek W.; Hargraves, P.; Sinclair, P.
Electrical transport in amorphous Fe-Mn-Zr alloysSrinivas, V.; Nigam, A. K.; Chandra, G.; Lawther, Derek W.; Yewondwossen, M.; Dunlap, R. A.
Vacancy generation resulting from electrical deactivation of arsenicLawther, Derek W.; Myler, U.; Simpson, P. J.; Rousseau, P. M.; Griffin, P. B.; Plummer, J. D.
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.
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
Chemical information in positron annihilation spectraMyler, U.; Goldberg, R. D.; Knights, A. P.; Lawther, Derek W.; Simpson, P. J.
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Mn-Si alloysDunlap, R. A.; Lawther, Derek W.; March, R. H.
Mossbauer-effect study of nondimensional and 2-dimensional quasi-crystalline alloys in the Al-Pd-Fe systemDunlap, R. A.; Wang, Z.; Lawther, Derek W.
On the question of stability and disorder in icosahedral aluminum - transition metal alloysLawther, Derek W.; Dunlap, R. A.; Srinivas, V.
Structural and Mossbauer effect studies of quasicrystalline Al-Pd-Cr-Fe alloysWang, Z.; Dunlap, R. A.; Lawther, Derek W.
Application of Mössbauer effect spectroscopy to the study of quasicrystalline materialsDunlap, R. A.; Lawther, Derek W.
Physical properties of amorphous Al-Gd-transition metal alloysDunlap, R. A.; Lawther, Derek W.; Mchenry, M. E.; Srinivas, V.; Beydaghyan, G.
Structure and stability of rapidly quenched Al86Cr14−xFex alloysLawther, Derek W.; Dunlap, R. A.; Lloyd, D. J.; Mchenry, M. E.
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Cu-T (T=Fe,V) alloysLawther, Derek W.; Beydaghyan, G.; Dunlap, R. A.
Positron-annihilation study of equilibrium defects in Al-Cu-Fe face-centered-icosahedral quasicrystalsLawther, Derek W.; 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.
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.
57Fe Mössbauer-effect study of preferential site occupancy in quasicrystalline Al86Cr14−xFex alloysDunlap, R. A.; Lawther, Derek W.; Lloyd, D. J.

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TitleTimes viewedLast viewed
On the electrical deactivation of arsenic in silicon - ir:ir-batch6-169633307:44:40 2014-10-01
Positron annihilation study of Al63Cu25Fe12 as a function of thermal treatment - ir:ir-batch6-171126114:59:26 2014-09-30
Mössbauer effect study of the stable Al75Pd15Fe10 decagonal quasicrystal - ir:ir-batch6-171022608:25:49 2014-10-01
ence Dunlap R., Yewondwossen M., and Lawther D., (1993) Mossbauer effect studies of amorphous Al-Y-Ni-Fe alloys - ir:ir-batch6-170725120:01:10 2014-09-30
Mossbauer effect studies of local Fe environments in crystalline and quasicrystalline Al-Cu-Fe alloys - ir:ir-batch6-170924623:52:31 2014-10-01
A Doppler broadening positron annihilation technique for the study of defects in bulk samples - ir:ir-batch6-169828115:46:19 2014-09-29
In situ 64Cu Doppler-broadening positron-annihilation methods for elevated temperature study of defect formation in metals formation in metals - ir:ir-batch6-170126303:47:33 2014-10-02
Thermal expansion of Bi2.2Sr1.8CaCu2Ox superconductor single crystals - ir:ir-batch6-170225612:29:39 2014-09-30
Variable-energy positron beam study of arsenic diffusion in poly-silicon - ir:ir-batch6-170422923:23:57 2014-09-24
Positron-beam techniques for materials characterization - ir:ir-batch6-176227119:25:03 2014-09-30
Correlated hyperfine interactions in amorphous Cr72-xFexC17Si8Al3 alloys - ir:ir-batch6-171822710:02:37 2014-09-27
Electrical transport in amorphous Fe-Mn-Zr alloys - ir:ir-batch6-170522619:21:12 2014-10-01
Vacancy generation resulting from electrical deactivation of arsenic - ir:ir-batch6-170022320:37:58 2014-09-29
57Fe Mössbauer-effect studies of quadrupole splitting distributions in icosahedral Al-TM-Fe quasicrystals - ir:ir-batch6-171323023:44:35 2014-10-01
Experimental identification of nitrogen-vacancy complexes in nitrogen implanted silicon - ir:ir-batch6-172229003:48:09 2014-10-02
Chemical information in positron annihilation spectra - ir:ir-batch6-169724920:11:41 2014-10-01
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Mn-Si alloys - ir:ir-batch6-172022816:24:33 2014-09-27
Mossbauer-effect study of nondimensional and 2-dimensional quasi-crystalline alloys in the Al-Pd-Fe system - ir:ir-batch6-170325517:22:31 2014-09-25
On the question of stability and disorder in icosahedral aluminum - transition metal alloys - ir:ir-batch6-171728415:36:35 2014-10-01
Structural and Mossbauer effect studies of quasicrystalline Al-Pd-Cr-Fe alloys - ir:ir-batch6-171222621:26:15 2014-09-30
Application of Mössbauer effect spectroscopy to the study of quasicrystalline materials - ir:ir-batch6-176321210:18:11 2014-09-27
Physical properties of amorphous Al-Gd-transition metal alloys - ir:ir-batch6-170823017:52:28 2014-09-30
Structure and stability of rapidly quenched Al86Cr14−xFex alloys - ir:ir-batch6-171627112:03:38 2014-10-01
A positron annihilation study of crystalline, quasicrystalline and amorphous Al-Cu-T (T=Fe,V) alloys - ir:ir-batch6-171424905:20:40 2014-10-01
Positron-annihilation study of equilibrium defects in Al-Cu-Fe face-centered-icosahedral quasicrystals - ir:ir-batch6-170622009:12:12 2014-10-01
Transition metal site distributions in binary aluminum-transition metal quasicrystals: Al-V and Al-Cr - ir:ir-batch6-171523923:54:36 2014-09-30
Positron beam study of annealed silicon nitride films - ir:ir-batch6-169927923:22:17 2014-09-29
Analysis of x-ray powder diffraction patterns of rapidly quenched A1-based alloys on the basis of quasicrystalline and cubic models - ir:ir-batch6-172123902:25:04 2014-10-02
57Fe Mössbauer-effect study of preferential site occupancy in quasicrystalline Al86Cr14−xFex alloys - ir:ir-batch6-171923301:53:29 2014-10-02