Structure analyses of Ba-silicate glasses

Schlenz, Hartmut; Kirfel, Α.; Schulmeister, K.; Wartner, N.; Mader, W.; Raberg, Wolfgang; Wandelt, K.; Oligschleger, C.; Bender, S.; Franke, R.; Hormes, J.; Hoffbauer, Wilfried; Lansmann, V.; Jansen, Martin; Zotov, Ν.; Marian, Christel M.; Putz, H.; Neuefeind, J.

doi:10.1016/s0022-3093(01)00922-x

Cited by 49 publications

(25 citation statements)

References 39 publications

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“…The very nature of the MRO domains, and especially their relation to the chemical structure is not yet clear. Definitely, they are no nanocrystals, as verified by the application of a broad spectrum of structurally sensitive methods [1]. In the present 0022-3093/$ -see front matter Ó 2004 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 85%

“…It is already present in one-component glasses and my be considered as the feature substituting the far-range order translational symmetry of the corresponding crystals. In fact, there is ample experimental evidence that oxide melts are not homogeneous down to the molecular scale [1]. Experimental observations on flow-induced birefringence [20], dielectric relaxation [21], low-temperature Raman and neutron scattering, and calorimetry [15,22,23] altogether suggest the existence of a MRO hierarchy of %1-2 nm size.…”

Section: Medium Range Order and Viscositymentioning

confidence: 99%

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Chemical structure, medium range order, and crystalline reference state of multicomponent oxide liquids and glasses

Conradt

2004

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 85%

Section: Medium Range Order and Viscositymentioning

confidence: 99%

Chemical structure, medium range order, and crystalline reference state of multicomponent oxide liquids and glasses

Conradt

2004

Journal of Non-Crystalline Solids

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“…For the K-silicate melts, we attribute this anomalous increase in volume (or decrease in density) to the presence of three-membered rings in the structure. For Ba-silicate glasses, Schlenz et al (2002) observed that considerable numbers of small rings are present. This indicates that the formation of threemembered rings could also be the cause of the anomalous volumetric behavior in Ba-silicate glasses.…”

Section: Heat Capacitymentioning

confidence: 99%

Structural control on bulk melt properties: Single and double quantum 29Si NMR spectroscopy on alkali-silicate glasses

Malfait

Halter

Morizet

et al. 2007

Geochimica et Cosmochimica Acta

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“…The ionic radii used for the calculation of V M , V O and C, were chosen from those reported by Shannon (21), taking into account the probable coordination number of each ion in the glass network, which was determined from an analysis of the related literature (1,(15)(16)(22)(23)(24)(25)(26)(27)(28)(29). In this way, a coordination number of 4 was assumed for Si 4+ and Al…”

Section: Glass Compositionsmentioning

confidence: 99%

Estudio de un efecto alcalinotérreo mixto sobre algunas propiedades de vidrios del sistema CaO-MgO-Al2O3-SiO2

Garza-García¹,

López-Cuevas²,

Chavarría³

et al. 2007

Bol. Soc. Esp. Ceram. Vidr.

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In the present work, we studied a "Mixed Alkaline-Earth Effect", i.e. the non-linear behaviour showed by the glass transition temperature as well as by the compressive strength of glasses of the CaO-MgO-Al 2 O 3 -SiO 2 system, when a part of the CaO contained in them was substituted by a BaO/SrO mixture, in variable molar proportions. An important factor for the occurrence of this phenomenon was the difference in atomic weight, ionic radii and field strength of the Ba 2+ and Sr 2+ ions in comparison with those corresponding to the Ca 2+ ion. Another factor considered was the likely occurrence of a microphase separation caused by the addition of BaO and/or SrO, together with the presence of F -and Mg 2+ in the glasses. Other glass properties studied as a function of the CaO substitution level were density, glass molar volume, oxygen molar volume, packing fraction, and chemical resistance in neutral, basic and acidic aqueous media. In general, the structural reinforcement of the glass network caused by the partial substitution of CaO by a BaO/SrO mixture was accompanied by an improvement in the alkaline resistance of the materials, which were found to be suitable for applications in corrosive environments, especially in basic media. En el presente trabajo, se estudia el comportamiento no lineal mostrado por la temperatura de transición vítrea y por la resistencia a la compresión de vidrios del sistema CaO-MgO-Al 2 O 3 -SiO 2 , cuando una parte del CaO contenido en los mismos es sustituido por una mezcla de BaO/SrO, en relación molar variable. Factores importantes para que se de este comportamiento son la diferencia entre pesos atómicos, radios iónicos e intensidad de campo de los iones Ba 2+ y Sr 2+ y los del propio ión Ca 2+. Otro factor considerado ha sido la probable existencia de una separación de microfases originada por la adición de BaO y/o SrO, junto con la presencia de flúor y magnesio en los vidrios. Otras propiedades estudiadas, en función del CaO sustituido, han sido la densidad, el volumen molar del vidrio, el volumen molar del oxígeno, la fracción de empaquetamiento, y la resistencia química en medios acuosos neutros, básicos y ácidos. En general, el refuerzo estructural del retículo vítreo causado por la sustitución parcial del CaO por una mezcla de BaO/SrO viene acompañada por una mejora en la resistencia alcalina, lo que hace que estos materiales sean adecuados para aplicaciones en ambientes corrosivos y especialmente en medios básicos.

show abstract

Structure analyses of Ba-silicate glasses

Cited by 49 publications

References 39 publications

Chemical structure, medium range order, and crystalline reference state of multicomponent oxide liquids and glasses

Chemical structure, medium range order, and crystalline reference state of multicomponent oxide liquids and glasses

Structural control on bulk melt properties: Single and double quantum 29Si NMR spectroscopy on alkali-silicate glasses

Estudio de un efecto alcalinotérreo mixto sobre algunas propiedades de vidrios del sistema CaO-MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>

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