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Mineralogical Characterization of Hispano-Moresque Glazes: A µ-Raman and Scanning Electron Microscopy with X-Ray Energy Dispersive Spectrometry (SEM-EDS) Study

Part of: Micrographia Collection

Published online by Cambridge University Press:  05 June 2018

Susana Coentro Open the ORCID record for Susana Coentro [Opens in a new window] ,
Rui C. da Silva ,
Cátia Relvas ,
Teresa Ferreira ,
José Mirão ,
Alfonso Pleguezuelo ,
Rui Trindade  and
Vânia S. F. Muralha
Susana Coentro*
Affiliation:
VICARTE – Research Unit “Glass and Ceramic for the Arts”, FCT, Caparica Campus, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal LAQV-REQUIMTE, DQ, FCT, Caparica Campus, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal Department of Conservation and Restoration, FCT, Caparica Campus, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
Rui C. da Silva
Affiliation:
IPFN-IST/UL, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela, Portugal
Cátia Relvas
Affiliation:
Departamento de Química, Escola de Ciência e Tecnologia, Laboratório HERCULES, Universidade de Évora, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal
Teresa Ferreira
Affiliation:
Departamento de Química, Escola de Ciência e Tecnologia, Laboratório HERCULES, Universidade de Évora, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal
José Mirão
Affiliation:
Departamento de Geociências, Escola de Ciência e Tecnologia, Laboratório HERCULES, Universidade de Évora, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal
Alfonso Pleguezuelo
Affiliation:
Universidad de Sevilla, C/S. Fernando, 4, C.P. 41004-Sevilla, España
Rui Trindade
Affiliation:
Museu Nacional de Arte Antiga (MNAA), Rua das Janelas Verdes, 1249-017 Lisboa, Portugal
*
*Author for correspondence: Susana Coentro, E-mail: susanacoentro@gmail.com
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Abstract

This work explores the combination of µ-Raman spectroscopy and scanning electron microscopy with X-ray energy dispersive spectrometry (SEM-EDS) for the study of the glazes in 15th–16th century Hispano-Moresque architectural tiles. These are high lead glazes that can be tin-opacified or transparent, and present five colors: tin-white, cobalt-blue, copper-green, iron-amber, and manganese-brown. They are generally homogenous and mineral inclusions are mostly concentrated in the glaze-ceramic interface. Through SEM-EDS, these inclusions were observed and chemically analyzed, whereas µ-Raman allowed their identification on a molecular level. K-feldspars, wollastonite and diopside were the most common compounds, as well as cassiterite agglomerates that render the glaze opaque. Malayaite was identified in green glazes, and andradite and magnesioferrite in amber glazes. Co–Ni–ferrites were identified in blue glazes, as well as Ni–Fe–olivines. Manganese-brown is the color where most compounds were identified: bustamite, jacobsite, hausmannite, braunite, and kentrolite. Through the µ-Raman analysis of different areas in large inclusions previously observed by SEM, it was possible to identify intermediate phases that illustrate the reaction process that occurs between the color-conferring compounds and the surrounding lead glaze. Furthermore, the obtained results allowed inference of the raw materials and firing temperatures used on the manufacture of these tiles.

Keywords

lead glazetileHispano-Moresqueµ-RamanSEM-EDS
Type
Micrographia
Information
Microscopy and Microanalysis , Volume 24 , Issue 3 , June 2018 , pp. 300 - 309
Copyright
© Microscopy Society of America 2018 

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Footnotes

†

In memoriam of our co-author and dear friend V.S.F. Muralha.

Cite this article: Coentro S, da Silva RC, Relvas C, Ferreira T, Mirão J, Pleguezuelo A, Trindade R, Muralha VSF (2018) Mineralogical Characterization of Hispano-Moresque Glazes: A µ-Raman and Scanning Electron Microscopy with X-Ray Energy Dispersive Spectrometry (SEM-EDS) Study. Microsc Microanal24(3): 300–309. doi: 10.1017/S1431927618000338

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