Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte

Detalhes bibliográficos
Autor(a) principal: Martins, Dália Teresa Al-Alavi
Data de Publicação: 2013
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/11037
Resumo: Dissertação para obtenção do Grau de Mestre em Engenharia Física
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spelling Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyteIonic conductivitySolid electrolyteEmitterIonic currentIon beamDissertação para obtenção do Grau de Mestre em Engenharia FísicaA compact ion-beam source based on rubidium silver iodide (RbAg4I5) solid electrolyte, deposited on a sharpened silver tip, has been developed and studied. Through an accelerating potential above 10 kV, established between emitter and collector, silver positive ions move through the electrolyte towards the emitting surface, where they are emitted from and accelerated. Via partial redox reaction occurring at the silver/RbAg4I5 interface, silver atoms are oxidised into Ag+ ions and migrate into the electrolyte, compensating the loss of emitted ions in the apex region. The emitted ions are collected by a Faraday cup, producing an electric current in the level of tens picoamperes. It was found that silver ions (atomic or clustered) make a major contribution to the measured ion current, although rubidium ions were also detected with concentration in six times lower than silver. The apex diameters of the final emitters were estimated in the range of 4-9 μm. The highest stable current was produced by an emitter whose apex diameter corresponds to 8.2 ± 0.5 μm. This current remained in the level of 20-25 pA for nearly 90 minutes and it was obtained at 92ºC, using an extraction voltage of 20 kV. Furthermore, it was observed that the current increased exponentially with temperature and linearly with applied voltage, at least for temperatures below 150 ºC and voltages in the range of 10-22 kV. Dependence on the apex diameter was not studied, since the RbAg4I5 film deposited on silver tips was not totally uniform. Several improvements should be performed to optimize the deposition methods, the design of heating system and methodology of the measurements (m/z characterization of the emitted particles). However, the developed ion-beam source can produce a stable current over a long period of time with minimal expenditure of energy and source material. Such sources have potential applications in materials science and spacecraft engineering as principal elements of miniaturized electric propulsion systems (ionic thrusters).Faculdade de Ciências e TecnologiaTolstoguzov, AlexanderRUNMartins, Dália Teresa Al-Alavi2014-01-20T11:17:12Z20132013-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/11037TID:201764288enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T03:45:18Zoai:run.unl.pt:10362/11037Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:19:59.889470Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
title Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
spellingShingle Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
Martins, Dália Teresa Al-Alavi
Ionic conductivity
Solid electrolyte
Emitter
Ionic current
Ion beam
title_short Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
title_full Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
title_fullStr Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
title_full_unstemmed Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
title_sort Compact ion-source based on superionic rubidium silver iodide (RbAg4I5) solid electrolyte
author Martins, Dália Teresa Al-Alavi
author_facet Martins, Dália Teresa Al-Alavi
author_role author
dc.contributor.none.fl_str_mv Tolstoguzov, Alexander
RUN
dc.contributor.author.fl_str_mv Martins, Dália Teresa Al-Alavi
dc.subject.por.fl_str_mv Ionic conductivity
Solid electrolyte
Emitter
Ionic current
Ion beam
topic Ionic conductivity
Solid electrolyte
Emitter
Ionic current
Ion beam
description Dissertação para obtenção do Grau de Mestre em Engenharia Física
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-01-01T00:00:00Z
2014-01-20T11:17:12Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/11037
TID:201764288
url http://hdl.handle.net/10362/11037
identifier_str_mv TID:201764288
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799137842558926848

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