Cargando…

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

The incorporation of nitrogen as a second anion species into oxide glasses offers unique opportunities for modifying glass properties via changes in glass polymerization and structure. In this work, the compositional dependence of elastic properties and the nanoindentation hardness of mixed alkaline...

Descripción completa

Detalles Bibliográficos
Autor principal: Ali, Sharafat
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9320866/
https://www.ncbi.nlm.nih.gov/pubmed/35888488
http://dx.doi.org/10.3390/ma15145022
_version_ 1784755897526910976
author Ali, Sharafat
author_facet Ali, Sharafat
author_sort Ali, Sharafat
collection PubMed
description The incorporation of nitrogen as a second anion species into oxide glasses offers unique opportunities for modifying glass properties via changes in glass polymerization and structure. In this work, the compositional dependence of elastic properties and the nanoindentation hardness of mixed alkaline-earth silicate oxynitride glasses containing a high amount of nitrogen (>15 at.%, c.a. 35 e/o) were investigated. Three series of silicon oxynitride glass compositions AE–Ca–Si–O–N glasses (where AE = Mg, Sr, and Ba) having varying amounts of modifiers were prepared using a new glass synthesis route, in which a precursor powder of metal hydrides was used. The obtained glasses contained high amounts of N (19 at.%, c.a. 43 e/o) and modifier cations (26 at.%, c.a. 39 e/o). Mg–Ca–Si–O–N glasses had high values of nanohardness (12–16 GPa), along with a reduced elastic modulus (130–153 GPa) and Young’s modulus (127–146 GPa), in comparison with the Sr–Ca- and Ba–Ca-bearing oxynitride glasses. Both the elastic modulus and the nanohardness of AE–Ca–Si–O–N glasses decreased with an increase in the atomic number of the AE element. These property changes followed a linear dependence on the effective cation field strength (ECFS) of the alkaline earth (AE) modifier, according to their valences and ionic radii. No mixed alkaline-earth effect was observed in the current investigation, indicating that the properties were more dictated by the nitrogen content.
format Online
Article
Text
id pubmed-9320866
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-93208662022-07-27 Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses Ali, Sharafat Materials (Basel) Article The incorporation of nitrogen as a second anion species into oxide glasses offers unique opportunities for modifying glass properties via changes in glass polymerization and structure. In this work, the compositional dependence of elastic properties and the nanoindentation hardness of mixed alkaline-earth silicate oxynitride glasses containing a high amount of nitrogen (>15 at.%, c.a. 35 e/o) were investigated. Three series of silicon oxynitride glass compositions AE–Ca–Si–O–N glasses (where AE = Mg, Sr, and Ba) having varying amounts of modifiers were prepared using a new glass synthesis route, in which a precursor powder of metal hydrides was used. The obtained glasses contained high amounts of N (19 at.%, c.a. 43 e/o) and modifier cations (26 at.%, c.a. 39 e/o). Mg–Ca–Si–O–N glasses had high values of nanohardness (12–16 GPa), along with a reduced elastic modulus (130–153 GPa) and Young’s modulus (127–146 GPa), in comparison with the Sr–Ca- and Ba–Ca-bearing oxynitride glasses. Both the elastic modulus and the nanohardness of AE–Ca–Si–O–N glasses decreased with an increase in the atomic number of the AE element. These property changes followed a linear dependence on the effective cation field strength (ECFS) of the alkaline earth (AE) modifier, according to their valences and ionic radii. No mixed alkaline-earth effect was observed in the current investigation, indicating that the properties were more dictated by the nitrogen content. MDPI 2022-07-19 /pmc/articles/PMC9320866/ /pubmed/35888488 http://dx.doi.org/10.3390/ma15145022 Text en © 2022 by the author. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ali, Sharafat
Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses
title Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses
title_full Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses
title_fullStr Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses
title_full_unstemmed Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses
title_short Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses
title_sort elastic properties and hardness of mixed alkaline earth silicate oxynitride glasses
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9320866/
https://www.ncbi.nlm.nih.gov/pubmed/35888488
http://dx.doi.org/10.3390/ma15145022
work_keys_str_mv AT alisharafat elasticpropertiesandhardnessofmixedalkalineearthsilicateoxynitrideglasses