CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS.
The physical properties of single crystals of samarium monosulfide exhibit a first order semiconductor-to-metal transition near 6.5 kbar. However, thin films of SmS show only a gradual change in their properties on applying pressure and this renders the technical utilization of the material difficul...
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The University of Arizona.
1984
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-1876502015-10-23T04:34:51Z CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS. HILLMAN, PAUL DALLAS. MacLeod, Angus Gibbs, Hyatt Optical films. Phase transformations (Statistical physics) Samarium -- Optical properties. Thin films. Vapor-plating. The physical properties of single crystals of samarium monosulfide exhibit a first order semiconductor-to-metal transition near 6.5 kbar. However, thin films of SmS show only a gradual change in their properties on applying pressure and this renders the technical utilization of the material difficult. Several mechanisms have been proposed as the cause of the smoothing of the transition. They include intrinsic stress, impurities, grain size, improper stoichiometry, and porosity, all of which can be traced to the physical vapor deposition techniques employed in preparing the films. In contrast, chemical vapor deposition was employed in this study because previous work had shown that it could minimize these detrimental modifications in thin films. A new CVD system was tested using a volatile organometallic as the samarium source and reacting it with H₂S. The deposited films contained considerable amounts of oxygen as evidenced by structure analysis, and the origin was traced to the samarium organometallic. The reaction of oxygen-free samarium tricyclopentadienyl with H₂S as well as chemical transport are suggested for deposition of stress-free SmS thin films in future work. 1984 text Dissertation-Reproduction (electronic) http://hdl.handle.net/10150/187650 690920561 8412667 en Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. The University of Arizona. |
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language |
en |
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NDLTD |
topic |
Optical films. Phase transformations (Statistical physics) Samarium -- Optical properties. Thin films. Vapor-plating. |
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Optical films. Phase transformations (Statistical physics) Samarium -- Optical properties. Thin films. Vapor-plating. HILLMAN, PAUL DALLAS. CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS. |
description |
The physical properties of single crystals of samarium monosulfide exhibit a first order semiconductor-to-metal transition near 6.5 kbar. However, thin films of SmS show only a gradual change in their properties on applying pressure and this renders the technical utilization of the material difficult. Several mechanisms have been proposed as the cause of the smoothing of the transition. They include intrinsic stress, impurities, grain size, improper stoichiometry, and porosity, all of which can be traced to the physical vapor deposition techniques employed in preparing the films. In contrast, chemical vapor deposition was employed in this study because previous work had shown that it could minimize these detrimental modifications in thin films. A new CVD system was tested using a volatile organometallic as the samarium source and reacting it with H₂S. The deposited films contained considerable amounts of oxygen as evidenced by structure analysis, and the origin was traced to the samarium organometallic. The reaction of oxygen-free samarium tricyclopentadienyl with H₂S as well as chemical transport are suggested for deposition of stress-free SmS thin films in future work. |
author2 |
MacLeod, Angus |
author_facet |
MacLeod, Angus HILLMAN, PAUL DALLAS. |
author |
HILLMAN, PAUL DALLAS. |
author_sort |
HILLMAN, PAUL DALLAS. |
title |
CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS. |
title_short |
CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS. |
title_full |
CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS. |
title_fullStr |
CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS. |
title_full_unstemmed |
CHEMICAL VAPOR DEPOSITION OF SAMARIUM COMPOUNDS FOR THE DEVELOPMENT OF THIN FILM OPTICAL SWITCHES BASED ON PHASE TRANSITION MATERIALS. |
title_sort |
chemical vapor deposition of samarium compounds for the development of thin film optical switches based on phase transition materials. |
publisher |
The University of Arizona. |
publishDate |
1984 |
url |
http://hdl.handle.net/10150/187650 |
work_keys_str_mv |
AT hillmanpauldallas chemicalvapordepositionofsamariumcompoundsforthedevelopmentofthinfilmopticalswitchesbasedonphasetransitionmaterials |
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1718098229718941696 |