The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study

Abstract The high economic importance of glass ceramics based on Li2O/Al2O3/SiO2 (LAS) is mainly due to their low coefficients of thermal expansion (CTE), which make these materials suitable candidates for a number of applications. The exact mechanism of the crystallization processes in LAS glasses...

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Autores principales:	Enrico Kleebusch, Christian Patzig, Michael Krause, Yongfeng Hu, Thomas Höche, Christian Rüssel
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/306c9c4614e24a4aa6a812e3a3638f50
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spelling	oai:doaj.org-article:306c9c4614e24a4aa6a812e3a3638f502021-12-02T15:05:45ZThe formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study10.1038/s41598-017-11228-72045-2322https://doaj.org/article/306c9c4614e24a4aa6a812e3a3638f502017-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-11228-7https://doaj.org/toc/2045-2322Abstract The high economic importance of glass ceramics based on Li2O/Al2O3/SiO2 (LAS) is mainly due to their low coefficients of thermal expansion (CTE), which make these materials suitable candidates for a number of applications. The exact mechanism of the crystallization processes in LAS glasses is still not fully understood. The present work focuses on the formation and development of nanocrystalline ZrO2 within an LAS base composition which contains only ZrO2 as nucleating agent. Using a combination of transmission electron microscopy and X-ray absorption spectroscopy techniques, the temporal evolution of the ZrO2 nanocrystal formation is described. It is found that the formation of ZrO2 is initiated by liquid-liquid phase separation droplets with high Zr content, which eventually evolve into the nanocrystalline ZrO2 precipitations. This process is accompanied by a gradual change of the coordination of the tetravalent Zr ions from sixfold in the glass to eightfold in the crystals. The diameters of the ZrO2 crystals stay well below 4 nm, even at late stages. The degree of crystallization at each step of the crystallization process is deduced, and from that, the Avrami coefficient n is determined to be n ≈ 1, which describes a barrier-limited crystal growth process.Enrico KleebuschChristian PatzigMichael KrauseYongfeng HuThomas HöcheChristian RüsselNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Enrico Kleebusch Christian Patzig Michael Krause Yongfeng Hu Thomas Höche Christian Rüssel The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study
description	Abstract The high economic importance of glass ceramics based on Li2O/Al2O3/SiO2 (LAS) is mainly due to their low coefficients of thermal expansion (CTE), which make these materials suitable candidates for a number of applications. The exact mechanism of the crystallization processes in LAS glasses is still not fully understood. The present work focuses on the formation and development of nanocrystalline ZrO2 within an LAS base composition which contains only ZrO2 as nucleating agent. Using a combination of transmission electron microscopy and X-ray absorption spectroscopy techniques, the temporal evolution of the ZrO2 nanocrystal formation is described. It is found that the formation of ZrO2 is initiated by liquid-liquid phase separation droplets with high Zr content, which eventually evolve into the nanocrystalline ZrO2 precipitations. This process is accompanied by a gradual change of the coordination of the tetravalent Zr ions from sixfold in the glass to eightfold in the crystals. The diameters of the ZrO2 crystals stay well below 4 nm, even at late stages. The degree of crystallization at each step of the crystallization process is deduced, and from that, the Avrami coefficient n is determined to be n ≈ 1, which describes a barrier-limited crystal growth process.
format	article
author	Enrico Kleebusch Christian Patzig Michael Krause Yongfeng Hu Thomas Höche Christian Rüssel
author_facet	Enrico Kleebusch Christian Patzig Michael Krause Yongfeng Hu Thomas Höche Christian Rüssel
author_sort	Enrico Kleebusch
title	The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study
title_short	The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study
title_full	The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study
title_fullStr	The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study
title_full_unstemmed	The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study
title_sort	formation of nanocrystalline zro2 nuclei in a li2o-al2o3-sio2 glass – a combined xanes and tem study
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/306c9c4614e24a4aa6a812e3a3638f50
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The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study

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