Výsledky vyhledávání - "Randall E. Youngman"

Akademický článek

Phase separation in mullite-composition glass

Autor: Stephen K. Wilke, Chris J. Benmore, Jan Ilavsky, Randall E. Youngman, Aram Rezikyan, Michael P. Carson, Vrishank Menon, Richard Weber

Publikováno v: Scientific Reports, Vol 12, Iss 1, Pp 1-7 (2022)

Abstract Aluminosilicates (AS) are ubiquitous in ceramics, geology, and planetary science, and their glassy forms underpin vital technologies used in displays, waveguides, and lasers. In spite of this, the nonequilibrium behavior of the prototypical

Externí odkaz: https://doaj.org/article/bfc3032168294e9baf97ad757ea78952

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Akademický článek

Effect of modifier cation size on the structure, properties and nickel speciation in BK7 type alkali borosilicate glasses

Autor: Brian Topper, Lucas Greiner, Randall E. Youngman, Darren Stohr, Efstratios I. Kamitsos, Doris Möncke

Publikováno v: Journal of Non-Crystalline Solids: X, Vol 17, Iss , Pp 100161- (2023)

Alkali-borosilicate glasses 16M2O–10B2O3–74SiO2 were studied for M = Li to Cs. 11B NMR showed 57% four-fold coordinated boron for Li, but 88 to 97% for M = Na to Cs. The fraction of neutral borate triangles decreases from Na to Cs. Vibrational sp

Externí odkaz: https://doaj.org/article/1c906876d37b4282822f124f56263d11

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Akademický článek

Low-temperature nucleation anomaly in silicate glasses shown to be artifact in a 5BaO·8SiO2 glass

Autor: Xinsheng Xia, D. C. Van Hoesen, Matthew E. McKenzie, Randall E. Youngman, K. F. Kelton

Publikováno v: Nature Communications, Vol 12, Iss 1, Pp 1-6 (2021)

The breakdown of classical nucleation theory at low temperatures for silicate glasses has been a puzzle for decades. Here, Xia et al. show with a long-term experiment for the specific case of a barium-silicate glass that this anomaly is in fact an ar

Externí odkaz: https://doaj.org/article/704be31d41744ad6b31cac41617d9dae

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Akademický článek

Nucleation pathways in barium silicate glasses

Autor: Matthew E. McKenzie, Binghui Deng, D. C. Van Hoesen, Xinsheng Xia, David E. Baker, Aram Rezikyan, Randall E. Youngman, K. F. Kelton

Publikováno v: Scientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)

Abstract Nucleation is generally viewed as a structural fluctuation that passes a critical size to eventually become a stable emerging new phase. However, this concept leaves out many details, such as changes in cluster composition and competing path

Externí odkaz: https://doaj.org/article/f5f3f34f264947b089d4a35e8f3b4525

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Akademický článek

Permanent Densification of Calcium Aluminophosphate Glasses

Autor: Saurabh Kapoor, Randall E. Youngman, Lina Ma, Nadja Lönnroth, Sylwester J. Rzoska, Michal Bockowski, Lars R. Jensen, Mathieu Bauchy, Morten M. Smedskjaer

Publikováno v: Frontiers in Materials, Vol 6 (2019)

High-temperature densification of oxide glasses influences their interatomic distances and bonding patterns, resulting in changes in the mechanical and chemical properties. Most high-pressure investigations have focused on aluminosilicate and alumino

Externí odkaz: https://doaj.org/article/34071f2c01b24bd5ac84b5a51818dede

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Akademický článek

Effects of Thermal and Pressure Histories on the Chemical Strengthening of Sodium Aluminosilicate Glass

Autor: Mouritz N. Svenson, Lynn M. Thirion, Randall E. Youngman, John C. Mauro, Mathieu eBauchy, Sylwester Janusz Rzoska, Michal eBockowski, Morten M. Smedskjaer

Publikováno v: Frontiers in Materials, Vol 3 (2016)

Glasses can be chemically strengthened through the ion exchange process, wherein smaller ions in the glass (e.g., Na+) are replaced by larger ions from a salt bath (e.g., K+). This develops a compressive stress (CS) on the glass surface, which, in tu

Externí odkaz: https://doaj.org/article/c14f75dee00e4381814bef757b8c466b

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