Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)

Sixteen glazes on medieval (14th–16th century AD) pottery fragments from Vega pottery workshop (Burgos, Spain) were characterized to investigate the production technology. To this end, Raman spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX) wer...

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Autores: Alonso Olazabal, Ainhoa, Ortega Cuesta, Luis Ángel, Zuluaga Ibargallartu, María Cruz, Alonso Fernández, Carmen, Jiménez Echevarría, Javier, Sarmiento Romayor, Alfredo
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/64868
Acceso en línea:http://hdl.handle.net/10810/64868
Access Level:acceso abierto
Palabra clave:firing temperatures
lead glazes
polymerization index
Raman spectrsocopy
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spelling Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)Alonso Olazabal, AinhoaOrtega Cuesta, Luis ÁngelZuluaga Ibargallartu, María CruzAlonso Fernández, CarmenJiménez Echevarría, JavierSarmiento Romayor, Alfredofiring temperatureslead glazespolymerization indexRaman spectrsocopySixteen glazes on medieval (14th–16th century AD) pottery fragments from Vega pottery workshop (Burgos, Spain) were characterized to investigate the production technology. To this end, Raman spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX) were used. The studied glaze samples correspond to fragments of high-quality glazed ware used by the wealthiest society in the city of Burgos. The most representative types of glazes, corresponding to honey-marble, honey-yellow, bright light green, and dark green types, were analysed. Raman spectroscopy shows lead was used as a fluxing agent in glaze production. SEMEDX analysis confirms the use of lead oxide and evidences that most of the samples underwent at least two firing processes. No Raman signals of crystalline phases were detected on either glaze surfaces or glaze thin-sections. The exception is the single firing of dark green glazes, which show pseudobrookite and rutile at the clay body/glaze interface measured in thin section. No colouring crystalline phases were identified by Raman spectroscopy either. However, SEM-EDX shows iron was the most-used colouring agent whereas copper was used for bright light green glazes. The polymerization index (Ip) values were used to estimate the firing temperatures. The polymerization index values are typically low for lead glazes and indicate firing temperatures below 700 C.This study was partially supported by the IT1193-19 Research Group of the Basque Country Government and by Cronos S.C. (Burgos)John Wiley & Sons202420242021info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/64868reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://analyticalsciencejournals.onlinelibrary.wiley.com/doi/10.1002/jrs.6328info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/© 2022 The Authors. Journal of Raman Spectroscopy published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.oai:addi.ehu.eus:10810/648682026-06-18T09:23:17Z
dc.title.none.fl_str_mv Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
title Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
spellingShingle Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
Alonso Olazabal, Ainhoa
firing temperatures
lead glazes
polymerization index
Raman spectrsocopy
title_short Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
title_full Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
title_fullStr Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
title_full_unstemmed Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
title_sort Glaze characterization of the glazed pottery from the medieval workshop of Vega (Burgos, Spain)
dc.creator.none.fl_str_mv Alonso Olazabal, Ainhoa
Ortega Cuesta, Luis Ángel
Zuluaga Ibargallartu, María Cruz
Alonso Fernández, Carmen
Jiménez Echevarría, Javier
Sarmiento Romayor, Alfredo
author Alonso Olazabal, Ainhoa
author_facet Alonso Olazabal, Ainhoa
Ortega Cuesta, Luis Ángel
Zuluaga Ibargallartu, María Cruz
Alonso Fernández, Carmen
Jiménez Echevarría, Javier
Sarmiento Romayor, Alfredo
author_role author
author2 Ortega Cuesta, Luis Ángel
Zuluaga Ibargallartu, María Cruz
Alonso Fernández, Carmen
Jiménez Echevarría, Javier
Sarmiento Romayor, Alfredo
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv firing temperatures
lead glazes
polymerization index
Raman spectrsocopy
topic firing temperatures
lead glazes
polymerization index
Raman spectrsocopy
description Sixteen glazes on medieval (14th–16th century AD) pottery fragments from Vega pottery workshop (Burgos, Spain) were characterized to investigate the production technology. To this end, Raman spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX) were used. The studied glaze samples correspond to fragments of high-quality glazed ware used by the wealthiest society in the city of Burgos. The most representative types of glazes, corresponding to honey-marble, honey-yellow, bright light green, and dark green types, were analysed. Raman spectroscopy shows lead was used as a fluxing agent in glaze production. SEMEDX analysis confirms the use of lead oxide and evidences that most of the samples underwent at least two firing processes. No Raman signals of crystalline phases were detected on either glaze surfaces or glaze thin-sections. The exception is the single firing of dark green glazes, which show pseudobrookite and rutile at the clay body/glaze interface measured in thin section. No colouring crystalline phases were identified by Raman spectroscopy either. However, SEM-EDX shows iron was the most-used colouring agent whereas copper was used for bright light green glazes. The polymerization index (Ip) values were used to estimate the firing temperatures. The polymerization index values are typically low for lead glazes and indicate firing temperatures below 700 C.
publishDate 2021
dc.date.none.fl_str_mv 2021
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/64868
url http://hdl.handle.net/10810/64868
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/10.1002/jrs.6328
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons
publisher.none.fl_str_mv John Wiley & Sons
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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