Characterization of thermal conductivity of SiO2-Al2O3-Y2O3 glasses

Sneha Samal; Jungki Lee; Dae Yong Jeong; Hyungsun Kim

doi:10.1016/j.tca.2015.01.010

Characterization of thermal conductivity of SiO₂-Al₂O₃-Y₂O₃ glasses

Sneha Samal, Jungki Lee, Dae Yong Jeong, Hyungsun Kim

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

The thermal properties of SiO₂-Al₂O₃-Y₂O₃ glasses were investigated within a temperature range of 25-800 °C. This found that glass with a composition of 24Y₂O₃·21Al₂O₃·55SiO₂ exhibits a thermal conductivity of 1.04 W/m K at room temperature, and thermal conductivity increases with temperature due to an increase in the amount of bridging oxygen. The thermal conductivity of glasses with a composition of xY₂O₃·21Al₂O₃·(79-x)SiO₂, on the other hand, decreased with an increase in either the Y₂O₃ content or Al₂O₃/SiO₂ ratio. This decrease in thermal conductivity was analyzed with respect to the decrease in phonon mean free path resulting from the increased non-bridging oxygen content, which revealed 24Y₂O₃·21Al₂O₃·55SiO₂ to have the maximum thermal conductivity of 1.7 W/m K at 800 °C. Glass systems incorporating yttria can therefore be considered suitable sintering additives for highly thermally conducting ceramics such as silicon nitride.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Thermochimica Acta
Volume	604
DOIs	https://doi.org/10.1016/j.tca.2015.01.010
State	Published - 20 Mar 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

Oxide glasses
SiO-YO-AlO glasses
Thermal conductivity
Thermal diffusivity

Access to Document

10.1016/j.tca.2015.01.010

Cite this

@article{19aa8876032f437d874efebe77f32f3e,

title = "Characterization of thermal conductivity of SiO2-Al2O3-Y2O3 glasses",

abstract = "The thermal properties of SiO2-Al2O3-Y2O3 glasses were investigated within a temperature range of 25-800 °C. This found that glass with a composition of 24Y2O3·21Al2O3·55SiO2 exhibits a thermal conductivity of 1.04 W/m K at room temperature, and thermal conductivity increases with temperature due to an increase in the amount of bridging oxygen. The thermal conductivity of glasses with a composition of xY2O3·21Al2O3·(79-x)SiO2, on the other hand, decreased with an increase in either the Y2O3 content or Al2O3/SiO2 ratio. This decrease in thermal conductivity was analyzed with respect to the decrease in phonon mean free path resulting from the increased non-bridging oxygen content, which revealed 24Y2O3·21Al2O3·55SiO2 to have the maximum thermal conductivity of 1.7 W/m K at 800 °C. Glass systems incorporating yttria can therefore be considered suitable sintering additives for highly thermally conducting ceramics such as silicon nitride.",

keywords = "Oxide glasses, SiO-YO-AlO glasses, Thermal conductivity, Thermal diffusivity",

author = "Sneha Samal and Jungki Lee and Jeong, \{Dae Yong\} and Hyungsun Kim",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

month = mar,

day = "20",

doi = "10.1016/j.tca.2015.01.010",

language = "English",

volume = "604",

pages = "1--6",

journal = "Thermochimica Acta",

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T1 - Characterization of thermal conductivity of SiO2-Al2O3-Y2O3 glasses

AU - Samal, Sneha

AU - Lee, Jungki

AU - Jeong, Dae Yong

AU - Kim, Hyungsun

PY - 2015/3/20

Y1 - 2015/3/20

N2 - The thermal properties of SiO2-Al2O3-Y2O3 glasses were investigated within a temperature range of 25-800 °C. This found that glass with a composition of 24Y2O3·21Al2O3·55SiO2 exhibits a thermal conductivity of 1.04 W/m K at room temperature, and thermal conductivity increases with temperature due to an increase in the amount of bridging oxygen. The thermal conductivity of glasses with a composition of xY2O3·21Al2O3·(79-x)SiO2, on the other hand, decreased with an increase in either the Y2O3 content or Al2O3/SiO2 ratio. This decrease in thermal conductivity was analyzed with respect to the decrease in phonon mean free path resulting from the increased non-bridging oxygen content, which revealed 24Y2O3·21Al2O3·55SiO2 to have the maximum thermal conductivity of 1.7 W/m K at 800 °C. Glass systems incorporating yttria can therefore be considered suitable sintering additives for highly thermally conducting ceramics such as silicon nitride.

AB - The thermal properties of SiO2-Al2O3-Y2O3 glasses were investigated within a temperature range of 25-800 °C. This found that glass with a composition of 24Y2O3·21Al2O3·55SiO2 exhibits a thermal conductivity of 1.04 W/m K at room temperature, and thermal conductivity increases with temperature due to an increase in the amount of bridging oxygen. The thermal conductivity of glasses with a composition of xY2O3·21Al2O3·(79-x)SiO2, on the other hand, decreased with an increase in either the Y2O3 content or Al2O3/SiO2 ratio. This decrease in thermal conductivity was analyzed with respect to the decrease in phonon mean free path resulting from the increased non-bridging oxygen content, which revealed 24Y2O3·21Al2O3·55SiO2 to have the maximum thermal conductivity of 1.7 W/m K at 800 °C. Glass systems incorporating yttria can therefore be considered suitable sintering additives for highly thermally conducting ceramics such as silicon nitride.

KW - Oxide glasses

KW - SiO-YO-AlO glasses

KW - Thermal conductivity

KW - Thermal diffusivity

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DO - 10.1016/j.tca.2015.01.010

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