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Showing papers by "Sylwester J. Rzoska published in 2021"



Journal ArticleDOI
TL;DR: In this paper, the thermal conductivity of densified soda lime borosilicate glasses with varying B2O3/SiO2 ratio was studied and a connection between the contribution of propagative vibrational modes to heat transfer and the volumetric constraint density across both as-made and densified samples was made.
Abstract: In this work, we study the thermal conductivity of densified soda lime borosilicate glasses with varying B2O3/SiO2 ratio Densification is induced by hot compression up to 2 GPa at the glass transition temperature We find that the structural and mechanical properties of the glasses exhibit a similar response to hot compression as other oxide glasses, including increasing density, elastic moduli, and fraction of four-coordinated boron across the full compositional range Generally, we find that thermal conductivity increases upon densification, but with a pronounced composition dependence, as silica-rich glasses exhibit only a minor increase (~8-10%) while borate-rich glasses exhibit a significant increase (>50%) We rationalize these variations in terms of topological constraint theory by showing a connection between the contribution of propagative vibrational modes to heat transfer and the volumetric constraint density across both as-made and densified samples These findings thus provide insights into the linkages between structure and thermal conductivity

7 citations


Journal ArticleDOI
TL;DR: In this article, the Cailletet-Mathias (CM) law of rectilinear diameter was used for determining the critical density for gas liquid-liquid critical point or the critical consolute concentration in mixtures of limited miscibility.

4 citations


Journal ArticleDOI
01 Sep 2021
TL;DR: In this paper, a ferroelectric ceramic-polymer composites based on barium-strontium titanate and water-thinnable polymeric dispersions were obtained by using tape casting method.
Abstract: The paper presents research on ferroelectric ceramic-polymer composites based on barium-strontium titanate and water-thinnable polymeric dispersions, obtained by using tape casting method. Barium strontium titanate with the assumed stoichiometry Ba0,65Sr0,35TiO3 was synthesized by the high temperature solid-state reaction. Water-thinnable polymeric dispersions were synthesized from butyl acrylate, styrene and tert-butyl acrylate containing different amounts of individual monomers. Then, the ceramic-polymer composites were obtained by tape casting. The influence of the chemical structure of synthesized binders on the rheological properties of the slurries and on physicochemical and electrical properties (characterized by using Broadband Dielectric Spectroscopy, BDS) of ceramic-polymer composites were investigated.

2 citations


Journal ArticleDOI
TL;DR: In this paper, the authors studied the deformation response of calcium aluminoborosilicate (CABS) glasses subjected to two types of post-treatment, namely hot compression and humid aging.
Abstract: Aluminoborosilicate glasses find a wide range of applications, which require good mechanical reliability such as surface damage resistance. Calcium aluminoborosilicate (CABS) glasses have recently been found to exhibit so-called intermediate behavior in terms of their response to sharp contact loading. That is, these glasses deform with less shear than normal glass and less densification than anomalous glasses. This deformation mechanism is believed to give rise to high crack initiation resistance of certain CABS glasses. In order to further improve and understand the micromechanical properties of this glass family, we studied the indentation response of different CABS glasses subjected to two types of post-treatment, namely hot compression and humid aging. Upon hot compression, density, elastic moduli, and hardness increased. Specifically, elastic modulus increased by as much as 20% relative to the as-made sample, while the largest change in hardness was 1.8 GPa compared to the as-made sample after hot compression. The pressure-induced increase in these properties can be ascribed to the increase in network connectivity and bond density. On the other hand, the crack initiation resistance decreased, as the hot compression increased the residual stress driving the indentation cracking. Humid aging had only a minor impact on density, modulus, and hardness, but an observed decrease in crack initiation resistance. We discuss the correlations between hardness, density, crack resistance, and deformation mechanism and our study thus provides guidelines for tailoring the mechanical properties of oxide glasses.

1 citations