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Composition–property relationships of the La2O3–Al2O3–SiO2 glass system
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för fysikalisk kemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för oorganisk kemi och strukturkemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för fysikalisk kemi.ORCID-id: 0000-0001-9409-2601
2010 (Engelska)Ingår i: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 356, nr 20-22, s. 1043-1048Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report physical properties of density, glass transition temperature, Vickers hardness and refractive index for 15 La–Al–Si–O glasses within the compositional region 10–28 mol% La2O3, 11–30% Al2O3 and 45–78% SiO2. The glass transition temperature varies only slightly between 871 and 883 °C. Both the density (3.25–4.33 g cm−3) and refractive index (1.59–1.70) display similar compositional dependencies and are primarily dictated by the La2O3 content. The hardness (6.4–9.0 GPa) increases with decreasing SiO2 content and to a minor extent also with the amount of La2O3 of the glass. The physical properties, in particular the hardness, are discussed with reference to glass structure. The similarity in the observed properties between the present oxide-based glasses and those of analogous rare-earth (RE) element-containing RE–Si–(Al)–O–N oxynitride glasses is highlighted and discussed in relation to the apparent, but hitherto largely neglected, role of RE-ions to primarily control many enhanced physical properties of oxynitride glasses.

Ort, förlag, år, upplaga, sidor
2010. Vol. 356, nr 20-22, s. 1043-1048
Nyckelord [en]
Lanthanum aluminosilicate glasses, La–Al–Si–O glasses, Rare earth ions, Physical properties, Density, Hardness, Compactness, Refractive index, Oxynitride glasses, Glass structure
Nationell ämneskategori
Oorganisk kemi
Forskningsämne
materialkemi; fysikalisk kemi
Identifikatorer
URN: urn:nbn:se:su:diva-49830DOI: 10.1016/j.jnoncrysol.2010.01.017ISI: 000277763600017OAI: oai:DiVA.org:su-49830DiVA, id: diva2:379698
Anmärkning
authorCount :3Tillgänglig från: 2010-12-19 Skapad: 2010-12-19 Senast uppdaterad: 2019-12-03Bibliografiskt granskad
Ingår i avhandling
1. Structure-Property-Composition Correlations in Rare-Earth Alumino-silicate Glasses
Öppna denna publikation i ny flik eller fönster >>Structure-Property-Composition Correlations in Rare-Earth Alumino-silicate Glasses
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Rare earth (RE) alumino-silicate (AS) glasses exhibit favorable physical, mechanical and optical properties, such as high values of the glass transition temperature, Vickers hardness, and refractive index. RE2O3-Al2O3-SiO2 glasses have found several industrial applications, for example as components of optical amplifiers and lasers. Many of these features stem from the high cation field-strength (CFS) of the trivalent RE ions (proportional to the valence of the ion divided by the square of its radius), which affects not only the physical properties of the glass, but also their structures.

This thesis deals with investigations of four different RE2O3-Al2O3-SiO2 systems, where RE represents either of La, Y, Lu or Sc. The glass forming regions of the latter two were reported by us for the first time. Within each system, glasses were prepared for variable RE, Si and Al contents.

The glass structures were investigated by solid-state 29Si and 27Al nuclear magnetic resonance (NMR) spectroscopy that informs about the local Si and Al environments in the glass network, which is built from interlinked SiO4 and AlO4 groups. Higher Al coordination numbers were also revealed by 27Al NMR: their amounts were observed to increase markedly as the CFS of the RE ion increases, i.e., along the series La<Y<Lu<Sc. This thesis discusses such structure/composition relationships, as well as the correlations between the glass composition and its physical properties of density, molar volume, compactness, glass transition temperature, Vickers hardness and refractive index. Some of these properties, for example the glass transition temperature and Vickers hardness, were observed to enhance as the RE3+ CFS increased.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2012. s. 79
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
fysikalisk kemi
Identifikatorer
urn:nbn:se:su:diva-69325 (URN)978-91-7447-431-2 (ISBN)
Disputation
2012-02-14, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Anmärkning

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Submitted. Paper 5: Manuscript.

Tillgänglig från: 2012-01-23 Skapad: 2012-01-11 Senast uppdaterad: 2019-12-09Bibliografiskt granskad

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