Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation

Detalhes bibliográficos
Autor(a) principal: Lameiras,Fernando Soares
Data de Publicação: 2009
Outros Autores: Nunes,Eduardo Henrique Martins, Vasconcelos,Wander Luiz
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000300011
Resumo: The infrared bands of amethyst and prasiolite samples from different origins were correlated to the trace elements contents. Amethysts have an iron content greater than 20 ppm and a low content of sodium and potassium. Prasiolites have an aluminum content greater than 120 ppm and a higher overall trace elements content, which accounts for a strong absorption between 3200 and 3600 cm-1. Colorless samples of quartz that become amethysts and prasiolites after irradiation have infrared spectra at room temperature with a broad band at 3441 cm-1 and a sharp band at 3595 cm-1. The broad band splits in several bands at low temperatures that are related to AlSi and FeSi. The color of amethysts and prasiolites are assigned to [AlSiO4/h+]º and [FeSiO4/h+]º centers formed by the exposure to ionizing irradiation and to the influence of lattice distortions due to the content of iron as a substitute for silicon and a high content of trace elements of large ionic radius like potassium.
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spelling Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiationamethystprasioliteinfrared spectrumirradiationtrace elementsThe infrared bands of amethyst and prasiolite samples from different origins were correlated to the trace elements contents. Amethysts have an iron content greater than 20 ppm and a low content of sodium and potassium. Prasiolites have an aluminum content greater than 120 ppm and a higher overall trace elements content, which accounts for a strong absorption between 3200 and 3600 cm-1. Colorless samples of quartz that become amethysts and prasiolites after irradiation have infrared spectra at room temperature with a broad band at 3441 cm-1 and a sharp band at 3595 cm-1. The broad band splits in several bands at low temperatures that are related to AlSi and FeSi. The color of amethysts and prasiolites are assigned to [AlSiO4/h+]º and [FeSiO4/h+]º centers formed by the exposure to ionizing irradiation and to the influence of lattice distortions due to the content of iron as a substitute for silicon and a high content of trace elements of large ionic radius like potassium.ABM, ABC, ABPol2009-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000300011Materials Research v.12 n.3 2009reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392009000300011info:eu-repo/semantics/openAccessLameiras,Fernando SoaresNunes,Eduardo Henrique MartinsVasconcelos,Wander Luizeng2009-11-06T00:00:00Zoai:scielo:S1516-14392009000300011Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2009-11-06T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
title Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
spellingShingle Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
Lameiras,Fernando Soares
amethyst
prasiolite
infrared spectrum
irradiation
trace elements
title_short Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
title_full Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
title_fullStr Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
title_full_unstemmed Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
title_sort Infrared and chemical characterization of natural amethysts and prasiolites colored by irradiation
author Lameiras,Fernando Soares
author_facet Lameiras,Fernando Soares
Nunes,Eduardo Henrique Martins
Vasconcelos,Wander Luiz
author_role author
author2 Nunes,Eduardo Henrique Martins
Vasconcelos,Wander Luiz
author2_role author
author
dc.contributor.author.fl_str_mv Lameiras,Fernando Soares
Nunes,Eduardo Henrique Martins
Vasconcelos,Wander Luiz
dc.subject.por.fl_str_mv amethyst
prasiolite
infrared spectrum
irradiation
trace elements
topic amethyst
prasiolite
infrared spectrum
irradiation
trace elements
description The infrared bands of amethyst and prasiolite samples from different origins were correlated to the trace elements contents. Amethysts have an iron content greater than 20 ppm and a low content of sodium and potassium. Prasiolites have an aluminum content greater than 120 ppm and a higher overall trace elements content, which accounts for a strong absorption between 3200 and 3600 cm-1. Colorless samples of quartz that become amethysts and prasiolites after irradiation have infrared spectra at room temperature with a broad band at 3441 cm-1 and a sharp band at 3595 cm-1. The broad band splits in several bands at low temperatures that are related to AlSi and FeSi. The color of amethysts and prasiolites are assigned to [AlSiO4/h+]º and [FeSiO4/h+]º centers formed by the exposure to ionizing irradiation and to the influence of lattice distortions due to the content of iron as a substitute for silicon and a high content of trace elements of large ionic radius like potassium.
publishDate 2009
dc.date.none.fl_str_mv 2009-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000300011
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000300011
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392009000300011
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.12 n.3 2009
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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