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1. Identificação
Tipo de ReferênciaArtigo em Evento (Conference Proceedings)
Sitemarte3.sid.inpe.br
Código do Detentorisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Identificador6qtX3pFwXQZsFDuKxG/z4jqK
Repositóriosid.inpe.br/marciana/2003/08.05.09.56
Última Atualização2018:02.20.12.21.12 (UTC) marciana
Repositório de Metadadossid.inpe.br/marciana/2003/08.05.09.56.32
Última Atualização dos Metadados2018:06.06.04.04.43 (UTC) administrator
Chave SecundáriaINPE-9868-PRE/5447
Rótuloself-archiving-INPE-MCTIC-GOV-BR
Chave de CitaçãoBandeiraAnRaClAbMoUe:1999:LeTeCr
TítuloLead-tin telluride crytal growth by VMS method in microgravity
FormatoPapel
Ano1999
Data de Acesso25 maio 2024
Tipo SecundárioPRE CN
Número de Arquivos1
Tamanho180 KiB
2. Contextualização
Autor1 Bandeira, Iraja Newton
2 An, Chen Ying
3 Rappl, Paulo Henrique de Oliveira
4 Closs, Humberto
5 Abramof, Eduardo
6 Motisuke, P.
7 Ueta, Antônio Yukio
Grupo1 LAS-INPE-MCT-BR
Afiliação1 Instituto Nacional de Pesquisas Espaciais. Laboratório Associado de Sensores e Materiais
Nome do EventoWorkshop Brasileiro sobre Microgravidade, 1.
Localização do EventoSão José dos Campos
Data19-21 maio 1999
Editora (Publisher)AEB
Cidade da EditoraBrasília
Páginas72-76
Título do LivroAnais
Tipo TerciárioSessão Técnica Oral
OrganizaçãoPrograma Nacional de Atividades Espaciais (PNAE)
Histórico (UTC)2015-05-18 14:44:01 :: administrator -> marciana :: 1999
2018-02-20 12:21:13 :: marciana -> administrator :: 1999
2018-06-06 04:04:43 :: administrator -> marciana :: 1999
3. Conteúdo e estrutura
É a matriz ou uma cópia?é a matriz
Estágio do Conteúdoconcluido
Transferível1
Tipo do ConteúdoExternal Contribution
Palavras-Chavecrystals
ResumoLarge homogeneous ternary alloy single crystals are a must for high performance optoelectronic devices such as diode lasers and infrared detector arrays. One practical choice for infrared detectors and semiconductor lasers in the wavelength range of 5 to 12 pm is the narrow band-gap semiconductor Pb1-x SnxTe. It is well known that, if D / v < L (where D is the diffusion coefficient, v the growth rate and L the crystal length), Bridgman growth in low gravity can result in crystals with more homogeneous axial concentration. This is due to the shift from convective growth on Earth to diffusion controlled steady-state (DCSS) growth in space. The only way to achieve DCSS growth on Earth is by reducing the growth aspect ratio (liquid height / ampoule diameter). In Bridgman growths it is possible to sustain a DCSS growth for a 50 mm length crystal if the bore of the growth ampoule is reduced to 2 mm. Another Earth bound method to avoid convection is the horizontal or vertical vapor-meltsolid (VMS) growth. In this method a thin stoichiometric liquid layer is formed at the interface between the solid and the vapor'. Such liquid layer, ahead of the crystallization front, has a thickness of the order of millimeters instead of the centimeters typical of Bridgman growth, reducing the Raleigh and Grashof number below critical values for vertical or horizontal growth respectively. While it is possible to find a method to eliminate buoyancy driven convection on Earth, very little can be done about surface-tension convection (Marangoni flow), which can give rise to axial and radial concentration inhomogeneities. When analyzing the ratio of Raleigh to Marangoni numbers (Bond number) in Bridgman growth in space, it is seen that even taking into account only the thermal gradient normal to the free surface, the surface tension driven convection is still an important factor for segregation. The same does not apply for VMS, where the Bond number is about 70 times smaller than that for Bridgman. To grow a crystal by VMS in microgravity conditions will be an excellent way to evaluate the mechanisms that give rise to radial and axial concentration inhomogeneties on melt grown crystals.
ÁreaFISMAT
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Conteúdo da Pasta docacessar
Conteúdo da Pasta sourcenão têm arquivos
Conteúdo da Pasta agreementnão têm arquivos
4. Condições de acesso e uso
URL dos dadoshttp://urlib.net/ibi/6qtX3pFwXQZsFDuKxG/z4jqK
URL dos dados zipadoshttp://urlib.net/zip/6qtX3pFwXQZsFDuKxG/z4jqK
Idiomapt
Arquivo Alvo9868.pdf
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Visibilidadeshown
Detentor da CópiaSID/SCD
Permissão de Atualizaçãonão transferida
5. Fontes relacionadas
Unidades Imediatamente Superiores8JMKD3MGPCW/3ESR3H2
Acervo Hospedeirosid.inpe.br/banon/2001/04.03.15.36
6. Notas
Campos Vaziosarchivingpolicy archivist callnumber copyright creatorhistory descriptionlevel dissemination doi e-mailaddress edition editor electronicmailaddress isbn issn lineage mark mirrorrepository nextedition notes numberofvolumes orcid parameterlist parentrepositories previousedition previouslowerunit progress project readergroup readpermission resumeid rightsholder schedulinginformation secondarydate secondarymark serieseditor session shorttitle sponsor subject tertiarymark type url versiontype volume
7. Controle da descrição
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