Fabrication of glass-ceramics containing spin-chain compound SrCuO2 and its high thermal conductivity

High thermal conductivity materials are in great demand for heat-flow control and heat dissipation in electronic devices. In this study, we have produced a glass-ceramics that contains spin-chain compound SrCuO2 and have found that the glass-ceramics yields high thermal conductivity of ∼5 W K−1 m−1...

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Bibliographic Details
Published in:Applied physics letters 2015-04, Vol.106 (14)
Main Authors: Terakado, Nobuaki, Watanabe, Kouki, Kawamata, Takayuki, Yokochi, Yuudai, Takahashi, Yoshihiro, Koike, Yoji, Fujiwara, Takumi
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied physics
Chains
Copper oxides
Crystallites
Crystallization
Electron diffraction
Electronic devices
Elongation
Flow control
Gallium oxides
Glass ceramics
Heat conductivity
Heat transfer
Product design
Strontium carbonate
Strontium copper oxide
Thermal conductivity
Transmission electron microscopy
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Summary:High thermal conductivity materials are in great demand for heat-flow control and heat dissipation in electronic devices. In this study, we have produced a glass-ceramics that contains spin-chain compound SrCuO2 and have found that the glass-ceramics yields high thermal conductivity of ∼5 W K−1 m−1 even at room temperature. The glass-ceramics is fabricated through crystallization of inhomogeneous melt-quenched oxides made from SrCO3, CuO, Li2CO3, Ga2O3, and Al2O3. Transmission electron microscopy and X-ray and electron diffraction reveal that SrCuO2 crystallites with a size of 100–200 nm are precipitated in the glass-ceramics. The highness of the thermal conductivity is attributable to two sources: one is elongation of phonon mean free path due to the crystallization of the inhomogeneous structure or structural ordering. The other is emergence of the heat carriers, spinons, in the SrCuO2. This highly thermal conductive glass-ceramics is expected to be utilized as base materials for heat-flow control devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4917035