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Piezoreflectance of Pure and Reacted Films of Gadolinium and Lutetium

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dc.contributor.author Homewood, Vanessa Jane
dc.date.accessioned 2008-08-05T02:17:35Z
dc.date.accessioned 2022-10-26T04:40:12Z
dc.date.available 2008-08-05T02:17:35Z
dc.date.available 2022-10-26T04:40:12Z
dc.date.copyright 1990
dc.date.issued 1990
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/24330
dc.description.abstract The reflectance and polarised piezoreflectance of gadolinium, lutetium, oxidised gadolinium, oxidised lutetium and hydrogenated lutetium has been measured from 1.5 to 6 eV. The measurements were made in situ in an ultra high vacuum chamber on thin films evaporated onto a single crystal quartz strain transducer. The reflectance was measured using a V-W configuration of the optics internal to the vacuum chamber. The reflectance of the two metals agreed with previous measurements and it was concluded that there was a large onset of sp → d band transitions below 3 eV with the sp and d bands being more widely separated in lutetium. The two metals had apparently similar piezoreflectance spectrum. The hydrostatic response of the modulated dielectric constant had an overall shape that was found to arise from a constant shift of the experimental joint density of states curve, implying a constant negative average deformation potential for sp → d transitions with energy. Following large exposures to oxygen, both metals retained essentially metallic properties in the bulk, with only a very dilute concentration of oxygen. Significant movement was seen in the critical point features under the influence of the oxygen implying movement of the electronic bands. A high energy feature appeared in the oxygenated spectrum of gadolinium at 4.55 eV and moved down with further oxidation. This was assigned to transitions from the oxygen 2p bands which had hybridized with the metal sp bands. The hydrogenated lutetium was found to be contaminated by substrate hydrogen. Significant changes in the reflectance and piezoreflectance were measured and agreed with predictions. The concentration of hydrogen was calculated to be 34 at % which implies that the sample was in the mixed phase of dihydride and solid solution. en_NZ
dc.language en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.subject Rare earth metals en_NZ
dc.subject Optical properties en_NZ
dc.subject Spectra en_NZ
dc.title Piezoreflectance of Pure and Reacted Films of Gadolinium and Lutetium en_NZ
dc.type Text en_NZ
vuwschema.type.vuw Awarded Doctoral Thesis en_NZ
thesis.degree.discipline Physics en_NZ
thesis.degree.grantor Te Herenga Waka—Victoria University of Wellington en_NZ
thesis.degree.level Doctoral en_NZ
thesis.degree.name Doctor of Philosophy en_NZ

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